Let's add the missing piece of information:
In this part of the lab we'll be taking some reasonable precautions to make sure that we don't allow undue contact between cat/dog parasites and the interior of our bodies.
Why are we more vigilant about zoonotic diseases for the Gametogenesis lab?
[Please remember to wash your hands!]
- The samples are fresh (they were very recently a part of a living organism.)
- The samples are from warm-blooded animals which have similar diseases to ours
- The samples are from mammals, so their parasites are closer evolved to us
- We are using sharp tools and razor blades, making access into our bloodstream potentially easier
All answers indicates the need for necessary precautions in the course of the experiment.
Explanation:
A zoonosis (plural zoonoses, or zoonotic diseases) is an infectious disease which originated from bacteria, viruses, or parasites that moves from non-human animals (mainly vertebrates) to humans. Major contemporary diseases like Ebola virus disease and salmonellosis are zoonoses.
Zoonoses have varying forms of transmission. In direct zoonosis the disease is mainly transmitted from other animals to humans via media e.g. air (influenza) or via bites and saliva (rabies).
Transmission could also be through an intermediate species (known as a vector), that serve as host for the disease pathogen as it is not affected by the diseases presence.
The need to be vigilant in the course of the lab experiment to avoid infection and transmission from one Hunan to another.
Answer:
Diseases which are spread from animals( higher animals )other than man to human being are called zoonosis. They are caused by bacteria, viruses, fungi and parasites in theses animals, and through bites, domestication, droplets contacts, farming, and hunting are passed to human. Some are also transmitted as vectors.
Statistically, they represented 61% of thousands of pathogens known to have infected human.
Answers.
Therefore during process of Gametogeneis and other experiemntal procedures in the laboratory, a lot of vigilance is needed because,
→In most cases to guarantee the experimental success, they are needed fresh to be used in the laboratory, thus careful measures not to have contact with the possible infected fluid and blood of these animals is needed.
→Human shared the almost same physiological make up with these animals, thus it is easy for human to also serve as host for the same pathogens that they harbour, thus during lab.preparations necessary protection to guide against these should be taken
→Experimental procedures may involved laceration, and which involved blood spillage and contacts.Therefore necessary measures is needed to avoid unnecessary cuts which may lead to infections transmission and possible contamination.
Explanation:
D
A certain drug prevents a neurotransmitter from initiating a response in the receiving neuron. Which of the following statements best describes the mechanism by which the drug may be acting?
a) The drug is preventing the neurotransmitter from binding to its receptors in the receiving neuron.
b) The drug is causing more neurotransmitter molecules to be released.
c) The drug is preventing the neurotransmitter from being degraded.
d) All of the listed responses describe how the drug may be acting.
Answer:
The correct answer is statement a.
Explanation:
Endogenous chemicals that take part in neurotransmission are known as neurotransmitters. It is a chemical messenger that performs transmission of impulses across a chemical synapse, that is, from one nerve cell to another. The neurotransmitters get discharged from the synaptic vesicles and pass onto the synaptic cleft, where they get attached to the receptors present on the target cells.
However, there are some of the drugs, which prevents the binding of a neurotransmitter with its receptor known as receptor antagonists. These antagonists or drugs prevent a neurotransmitter from starting a response in the receiving nerve cell. Some of the receptor antagonists are beta-blockers, alpha-blockers, and calcium channel blockers.
Above a certain substrate concentration, the rate of an enzyme-catalyzed reaction drops as the enzymes become saturated. Which of the following would lead to a faster conversion of substrate into product under these saturated conditions?
a. an increase in concentration of enzyme
b. decreasing the temperature
c. increasing the substrate concentration
d. add a noncompetitive inhibito
Answer:
- An increase in concentration of enzyme
- Increasing the substrate concentration.
Both will increase the enzyme concentration or slightly increasing the temperature will increase the rate of product formation
When conditions in the environment change, a lack of genetic diversity may be disadvantageous for organisms that reproduce __________. Genetic diversity may be advantageous for organisms that reproduce when conditions in an environment change.
Answer:
When conditions in the environment change, a lack of genetic diversity may be disadvantageous for organisms that reproduce asexually . Genetic diversity may be advantageous for organisms that reproduce when conditions in an environment change.Explanation:
Each organism is required to have a specific set of factors that are required to produce more healthy offspring, as for the asexual reproduction to be carry out by the certain organisms there is a priority of having a more diverse form of environment for the organisms to carry out there reproduction or else it will derail there whole rate of producing healthy offspring.When conditions in the environment change, a lack of genetic diversity may be disadvantageous for organisms that reproduce asexually.
REPRODUCTION:
Reproduction in living organisms can either occur sexually or asexually. Sexual reproduction involves two organisms while asexual reproduction involves a sole organism. Because sexual reproduction involves the unique combination of genetic material of two different individuals, genetic diversity is ensured in the offsprings whereas, this is not the case in asexual reproduction. Genetic diversity confers the ability to resist environmental adverse conditions like disease and pest infestation etc. on individual species of a population. Therefore, when conditions in the environment change, a lack of genetic diversity may be disadvantageous for organisms that reproduce asexually.Learn more about genetic diversity at: https://brainly.com/question/14696671?referrer=searchResults
Bacteria naturally prefer company instead of solitude for growth. Examples of this kind of communal growth pattern can be found everywhere, from surfaces of the teeth and the intestines, to the surface of a slimy rock in the lake, to the thick floc that clogs water pipes. These examples of communal bacterial growth are known by what name?
A) infectious unit
B) colony
C) biofilm
D) planktonic unit
Answer:
The correct option is (C). The above mentioned definition is true for biofilm that resembles a slimy structure composed of cells attached to each other.
Explanation:
The adherent cells that results due to the formation of biofilm are known to invade the slimy extracellular matrix that are made up of extracellular polymeric substances. These embedded cells serves the function of production of EPS component that is composed of genetic material, polysaccharides and lipids. These biofilms are capable of growth on the living as well as the non living things.
Formation of biofilm by the microbes occurs due to several factors namely nutritional factors, antibiotic attack and cellular recognition to the attachment site. The defined steps of the biofilm formation includes initial attachment, Irreversible attachment, Maturation I, Maturation II and Dispersion.
If the frequency of a particular allele that is present in a small, isolated population of alpine plants decreases due to a landslide that leaves an even smaller remnant of surviving plants bearing this allele, then what has occurred? A. A bottleneck B. Genetic drift C. Microevolution D. A and B only E. A, B, and C are all correct.
Answer:
Option-E
Explanation:
Genetic drift refers to the change in the frequency of the alleles in a small population over a short duration of time. This change in frequency is due to the random process like a natural catastrophe.
In the given question, the population of alpine decreased and resulted in the smaller surviving plant population. This changed the gene pool of the population and resulted in the genetic drift.
However, this also leads to the macroevolution as the process changes the population survival, as well as the bottleneck effect, is observed as the smaller gene pool survives and will reproduce.
Thus, Option-E is correct.
The synthesis of an amino acid follows this pathway: precursor A → intermediate B → amino acid C. Each reaction is catalyzed by a different enzyme. This metabolic pathway is controlled by feedback inhibition with amino acid C inhibiting the conversion of precursor A to intermediate B. Amino acid C acts as a _____ of the first enzyme in the pathway.
Answer:
The synthesis of an amino acid follows this pathway: precursor A → intermediate B → amino acid C. Each reaction is catalyzed by a different enzyme. This metabolic pathway is controlled by feedback inhibition with amino acid C inhibiting the conversion of precursor A to intermediate B. Amino acid C acts as a noncompetitive inhibitor of the first enzyme in the pathway.
Explanation:
A no-competitive inhibitor reduces the activity of an enzyme by binding at its active site although it has already bound to the corresponding substrate
Amino acid C acts as a noncompetitive inhibitor, regulating its own production via feedback inhibition. This is a common mechanism used in metabolic pathways to maintain balance.
Explanation:In the described pathway, amino acid C regulates its own production by inhibiting the first step of the pathway. This is an example of a regulatory mechanism called feedback inhibition. Essentially, when there's plenty of amino acid C present, it will bind to the first enzyme in the pathway, preventing its action and thus stopping more of amino acid C from being produced. So, in this scenario, amino acid C is acting as a noncompetitive inhibitor of the first enzyme in the pathway.
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Charles Darwin's observations that finches of different species on the Galapagos Islands have many similar physical characteristics supports the hypothesis that these finches A all eat the same type of food. B acquired traits through use and disuse. C descended from a common ancestor. D have the ability to interbreed.
Answer:
C descended from a common ancestor
Explanation:
Darwin’s voyage which included an exploration of the Galapagos Islands led him to discover that there are several different species of finches on the various Islands of the Galapagos. More interesting is the fact that, these finches he found on the various Islands of the Galapagos have similar physical characteristics with that of the finches from other parts of South America compared to those in other islands of the world. This finding supports the hypothesis that these finches descended from a common ancestral population of South America birds that eat seeds.
Final answer:
Darwin's observations suggest that Galapagos finches descended from a common ancestor (c) , with beak variations as an adaptation to available food sources.
Explanation:
Charles Darwin's observations that finches of different species on the Galapagos Islands have many similar physical characteristics support the hypothesis that these finches descended from a common ancestor. Darwin noted that the finches shared a graded series of beak sizes and shapes, which appeared to be adaptations to their specific ecological niches and food sources. The differentiation in beak size and shape among the finches suggests that natural selection based on different food sources in their respective habitats led to adaptive changes over generations.
What was Mendel referring to when he wrote that "the hybrid character resembles that of one of the parental forms so closely that the other either escapes observation completely or cannot be detected with certainly...." ?
Answer:
It means that one either exactly resembles a parent or it does not.
Explanation:
A friend of yours appears to have put on a lot of muscle very quickly. At the same time, you notice that your friend seems to have a lot of mood swings and appears depressed. It is reasonable for you to suspect that your friend has begun to take ______.
Answer:
An anabolic steroid
Explanation:
Anabolic steroids ca also e referred to as anabolic-androgenic steroids. They are synthetic or man-made steroids that mimic natural androgens like testosterone in their structure and functions. It is majorly used for muscle mass building.
When anabolic steroids are misused or abused, it can have an effect on an individual's mental health and presenting symptoms like depression, mood swings, mania, aggression etc.
Some athletes and bodybuilders take anabolic steroids to promote building of their muscle mass rapidly.
Bacteria can replicate once:
A. Every 20 seconds
B. Bacteria can not replicate without the help of a host
C. An hour
D. Every 24 hours
Answer:
most bacteria replicate every 20 minutes, if the conditions are good. i really dont know about the other answers, because bacteria can live outside of a host, longer than a normal virus can. and for sure its NOT A or C. so its a 50-50 shot B or D. sorry i couldn't help any further
Explanation:
You find a multi-legged animal in your garden and want to determine if it is a centipede or a millipede. You take the animal to a university where a myriapodologist quickly tells you that you have found a centipede. Which of the following may have allowed her to make this distinction?A) segmentationB) poisonous fangsC) egg-layingD) molting
Answer: A- segmentation
Explanation:
Both Millipedes and centipedes are arthropods with jointed legs and multiple segments. While millipedes are flattened slightly with multi segmented bodies, where the first segment is usually legless, while the second to the fourth are characterised with two legs and then the rest have four legs.
A centipede on the other hand, is a multi segmented anthropod a pair of legs on each segment, and their legs range from 30 to 354 on their one inch length bodies, which are known to be longer than that of millipedes.
NADH is also used by cells when making certain molecules. Based on your knowledge of the role of NADH in cellular respiration, what do you think NADH's role is in biosynthesis of molecules?1. Oxidising molecules2. Phosphorylating molecules3. Dehydrating molecules4. Reducing molecules
Answer:
The correct answer is 4. reducing molecule
Explanation:
NADH is a coenzyme that plays an important role in making ATP during cellular respiration or oxidative phosphorylation. It stays in two forms in the cell which is NADH which is it's reduced form and NAD+ which is it's oxidized form.
So as NADH is a reduced form and it acts as the electron donor and feed electron in the electron transport chain during oxidative phosphorylation. After donating electron it gets converts into it's oxidized form which is NAD+. Therefore NADH acts as reducing molecule in cellular respiration.
A ________ is a request sent to software vendors describing a new system that an organization requires in broad, high-level terms, to which interested vendors can respond by describing the products and services that could fit the requirement.
A) request for proposal
B) request for information
C) request for quotation
D) request for tender
Answer:B) request for information
Explanation: Request for information is the gathering of written information about the capabilities of potential supplies for a goods or service.
Like the ______________, the shoulder is classified as ______________ based upon its degrees of freedom. A Hip and wrist; triaxial B Wrist; biaxial CHip; triaxial D Hip and vertebral column; uniaxial
Answer:
I would say C.) Hip; triaxial
Explanation:
The shoulder is a triaxial joint and so is the hip but the wrist is biaxial
An amoeba, a protozoan that moves by pseudopodia, approaches a smaller protozoan and extends its pseudopodia (extensions of cytoplasm in plasma membrane) around the smaller protozoan. Once the amoeba’s pseudopodia completely surrounds the other protozoan, the amoeba’s plasma membrane pinches off by folding back into the amoeba and creating a vesicle containing the smaller protozoan. This vesicle is now within the amoeba itself and will soon fuse with other vesicles containing digestive enzymes. This is an example of Group of answer choicesa phagocytosis. b. osmosis. c. pinocytosis.
Answer: A phagocytosis
Explanation:
This involves the engulfing of solid matter or living organisms by other organisms known as phagocytes during their feeding process.
The process in which an amoeba engulfs another protozoan using its pseudopodia is called phagocytosis. This is an essential feeding mechanism for amoebas belonging to the Amoebozoa supergroup and involves the formation of a phagosome that fuses with lysosomes to digest the food.
Explanation:When an amoeba uses its pseudopodia to surround and ingest a smaller protozoan, this process is known as phagocytosis. Phagocytosis involves the extension of the plasma membrane to wrap around a solid particle, leading to the engulfment of the particle and formation of a vesicle known as a phagosome or food vacuole. This vesicle will ultimately fuse with lysosomes that contain digestive enzymes to break down the ingested material. This type of endocytosis is distinct from pinocytosis, where the cell ingests extracellular fluid containing dissolved substances, and receptor-mediated endocytosis, where specific particles bound to receptors on the plasma membrane are internalized.
The supergroup Amoebozoa includes a variety of protozoans that move and ingest food using amoeboid movement facilitated by pseudopodia. The process of phagocytosis is a critical aspect of the cellular feeding mechanism employed by amoeba and several other unicellular organisms, where after digestion, waste is expelled from the cell by exocytosis.
What cells of the nervous system are responsible for anchoring neurons to their blood vessels and controlling the extracellular fluid concentrations of potassium and neurotransmitters?
Answer:
astrocytes
Explanation:
Astrocytes, a type of glial cell, are responsible for anchoring neurons to blood vessels and controlling the extracellular fluid concentrations of potassium and neurotransmitters.
Explanation:Astrocytes, which are a type of glial cell in the central nervous system, are responsible for anchoring neurons to their blood vessels and controlling the extracellular fluid concentrations of potassium and neurotransmitters. They support neurons by maintaining the chemical environment of the CNS tissue and regulating the balance of ions in the extracellular fluid. If the balance of ions is disrupted, it can have significant effects on membrane potential and electrochemical signaling.
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Several days ago, Ravi fell and hurt his ankle. Although it bothered him a little, he continued to walk on it. When he finally went to the doctor for X-rays, he found that he had a broken bone. It is likely that Ravi carries a gene that boosts the availability of:
Answer:
endorphins
Explanation:
Ravi likely carries a gene that increases the availability of osteoblasts, which are cells necessary for bone repair and growth. These cells would have helped to start the healing of his fractured bone even while under the stress of being walked on. Healthy levels of osteoblasts contribute to more efficient bone repair and maintenance.
Explanation:Ravi, who continued to walk on his ankle despite it being injured, may carry a gene that boosts the availability of osteoblasts, which are cells responsible for forming new bone. Osteoblasts play a crucial role in the healing and repair of broken bones. When a bone is fractured, they migrate to the site of the break and start constructing new bone tissue, a process which may take a couple of months for the development of compact and spongy bone.
Having a high availability of osteoblasts could explain why Ravi was able to still walk on a broken ankle, as the healing process may have been more efficient in his body. This biological response is particularly important for individuals with conditions affecting bone density, such as osteoporosis, which makes bones fragile and more prone to fractures.
Besides genetics, factors such as a healthy diet rich in calcium and vitamin D, weight-bearing exercise, and overall good health contribute to effective bone repair and maintenance.
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Which cell structures are present in mature sieve tube cells, but not in mature vessel elements? Select all that apply. smooth endoplasmic reticulum nucleus mitochondria cytoplasm cell wall
Answer:
cytoplasm
smooth endoplasmic reticulum
mitochondria
In mesophiles, growth rates increase gradually as the temperature is increased, until the optimum growth temperature for the organism is reached. If the temperature is increased beyond the optimum, __________.
Answer: Growth rate of the mesophiles decreases as the temperature increases.
Explanation:
The growth rate of the mesophiles will decrease on increasing the temperature because mesophiles defines the condition which ranges in between 20 and 45 °C (68 and 113 °F).
If the temperature of the environment is more or below this range then the growth rate of the bacteria will be affected.
These are the bacteria which is found in plain regions as the temperature there is optimum for their growth.
Final answer:
If the temperature is increased beyond the optimum for mesophiles, their growth rates decline due to protein denaturation, eventually leading to cell death. Mesophiles are adapted to moderate temperatures, unlike thermophiles, which thrive at much higher temperatures.
Explanation:
If the temperature is increased beyond the optimum for mesophiles, the growth rates will start to decline. This decline is due to the denaturation of proteins and other essential cellular components, which impairs the cell's function and can eventually lead to cell death. Mesophiles, unlike thermophiles, do not possess the necessary adaptations to withstand high temperatures and maintain their cellular integrity.
Therefore, beyond their optimum temperature range, which is generally between 20°C and 45°C, the high temperature can be lethal to mesophilic organisms.
Mesophiles are typically found in environments such as the human body, which has a normal temperature of around 37°C. They play critical roles in processes like food production, including the making of cheese, yogurt, and the fermentation process in beer and wine.
On the other hand, thermophiles thrive at temperatures above 50°C, which are often fatal for mesophilic organisms.
Only certain organs called the target organs respond to the presence of a specific hormone because
Answer:
Because receptors which are sensitive to the specific hormones are present only in the target organs
Explanation:
Hormones receptors are specialized proteins which are sensitive to particular hormone stimulus. They are responsible for receiving hormones signals as inputs in the target organs, to produce cascade of events as response in the target organs . They usually need small concentration of specific hormones to bind with to produce large effects in corresponding cells functions and morphology.
They can be located in cell membrane where they are called peptide hormone receptors; thus they receive input signals from peptide hormones from the cells surfaces,and stimulated cascade of events to bring about responses inside the cells. Therefore are also called trans-membrane receptors.
However,some can be integrated within the cytoplasm, where they are called nuclear receptors. to initiate cascade of events in the cells which affect the functions of the cells either for secretion or intake of a particular substances.
Final answer:
Target organs respond to specific hormones because only those organs contain cells that have the necessary receptor proteins for the hormones, initiating changes in cellular function.
Explanation:
Why Only Certain Organs Respond to Specific Hormones
Only certain organs, known as target organs, respond to the presence of a specific hormone because only some cells have receptor proteins that can bind to a given hormone. Hormones will travel through the bloodstream, but they can only influence cells that have specific hormone receptors for that hormone. When a hormone interacts with its receptor on a target cell, it initiates a series of cellular events, typically resulting in changes in cellular function, such as the activation of enzymatic pathways or regulation of gene expression that controls protein synthesis. The specificity of hormone-receptor interactions ensures that hormonal signals are accurately and efficiently relayed to the appropriate cellular targets.
The long plateau phase of the cardiac muscle action potential is due to
Explanation:
The long plateau phase of the cardiac muscle action potential is due to Calcium channels remaining open.Depolarization is trailed by the plateau phase wherein film potential decreases generally gradually. This is expected in enormous part to the opening of the moderate Ca2+ channels, permitting Ca2+ to enter the cell while few K+ channels are open, permitting K+ to leave the cell. During stage 1, there is halfway repolarization, in view of an abatement in sodium porousness. Stage 2 is the plateau phase of the cardiovascular activity potential. Film penetrability to calcium increments during this stage, keeping up depolarization and dragging out the activity potential.The long plateau phase of the cardiac muscle action potential is due to the sustained influx of calcium ions, which leads to a prolonged contraction period and an extended refractory period necessary for effective heart function.
Explanation:The long plateau phase of the cardiac muscle action potential is a key feature that distinguishes it from skeletal muscle. This is primarily due to the influx of calcium ions through slow calcium channels. These calcium ions are largely responsible for the prolonged duration of the plateau phase, which facilitates an extended refractory period that is crucial for the cells' proper functioning.
During the plateau phase, calcium ions enter the cardiac muscle fibers, allowing for a more extended contraction. This period is essential for cardiac function as it permits the heart muscle cells to fully contract before another electrical event can occur, thus ensuring effective blood pumping. The calcium ions not only enable this prolonged contraction but also interact with troponin within the troponin-tropomyosin complex, ultimately initiating the process of muscle contraction.
In adults, red blood cells are made in one place, spend mostof their lifespan in another and most are finally destroyed in yetanothe rplace. Which choice lists these locations in the correctchronological order?
a. bone marrow, blood vessels, spleen
b. bone marrow, spleen, blood vessels
c. spleen, blood vessels, spleen
d. blood vessels, spleen, bone marrow
e. spleen, blood vessels, bone marrow
Answer:
a
Explanation:
red blood cells are manufactured in the bone marrow stay in blood vessels and destroyed in spleen
A chemical is reported to inhibit bacterial replication. Bacterial cells are placed in medium with all nutrients necessary for replication. The chemical is added to the culture, and after a half hour an extract of the DNA is prepared. A significant percentage of the DNA is in pieces about 1000 to 2000 bases in length. The results are consistent with the chemical blocking the function of DNA ligase.a) trueb) false
Answer:
True
Explanation:
DNA ligases are enzymes required for replication, repair, and recombination of DNA molecules. The DNA ligase repairs the break in the DNA molecule by the formation of a phosphodiester bond.
The bacterial genome consists of a circular DNA molecule, thereby laboratories use these enzymes to create recombinant DNA molecules
Final answer:
The statement is true; the chemical likely inhibits DNA ligase function, leading to the observed accumulation of DNA fragments that are characteristic of interrupted DNA replication.
Explanation:
The scenario described in the question pertains to an experimental condition where bacterial DNA is extracted after being exposed to a chemical that inhibits replication. The observed DNA fragments of 1000 to 2000 bases in length suggest an interruption in the replication process, which is consistent with the action of a DNA ligase inhibitor. DNA ligase is an enzyme crucial for joining Okazaki fragments on the lagging strand during replication. In the absence of ligase function, these fragments cannot be joined to form a continuous strand, leading to the accumulation of short strands consistent with the reported size of 1000 to 2000 bases.
Reiji Okazaki's experiments with phage and E. coli hinted at the importance of DNA ligase in the replication process. Mutants with deficient DNA ligase accumulated short fragments, which were later termed Okazaki fragments. This corroborates with the observation in the question, where the presence of the inhibitor caused the accumulation of similarly sized DNA strands.
In 1992, the U.S. Environmental Protection Agency (EPA) introduced ____ as a voluntary labeling program designed to identify and promote energy-efficient products to reduce greenhouse gas emissions.
Answer:
energy star.
Explanation:
Its main objective is to help consumers, businesses, and industry save money and protect the environment through the adoption of energy-efficient products and practices.
For a protein to be an integral membrane protein it would have to be
Answer:
permanently attached to the cell membrane
Explanation:
for a protein to be an integral membrane protein, it would have to be permanently attached to the cell membrane and they are mostly transmembrane proteins. they are also called intrinsic proteins with more than one segment integrated into the phospholipid bilayer of the membrane.
An integral membrane protein must be embedded within the lipid bilayer of the cell membrane, interacting with its nonpolar tails. These proteins perform functions such as transport of substances, signal transduction, or cell bonding.
Explanation:For a protein to be an integral membrane protein, it must be embedded within the lipid bilayer of the cell membrane. Integral membrane proteins usually have a hydrophobic region that interacts with the nonpolar tails of the phospholipids in the cell membrane. This interaction ensures the protein remains in the membrane. For instance, some functions of these proteins can include transporting substances across the membrane, acting as receptors for signal transduction, or joining cells together. They interact closely with the lipids in the cell membrane and, to remove them, it typically requires a detergent to dissolve the membrane.
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________ is the biological heritage (including physical characteristics such as one's skin color and associated traits) that people use to identify themselves.
Answer: Race
Explanation: Race is a heritage that various and diverse group of people use to identify with each other. Race may include physical characteristics such as the skin color example the black race and other associated traits such as facial features and hair texture
Even in Darwin's time, the blending hypothesis was incompatible with observed facts. If the blending hypothesis were true, then what should one expect to observe over the course of generations?A) Phenotypic polymorphisms should increase.
B) Genetic variation should increase.
C) Members of a breeding population should become more uniform in phenotype.
D) Neutral variation should decrease.
E) Genetic polymorphisms should increase.
Answer:
C) Members of a breeding population should become more uniform in phenotype.
Explanation:
The blending hypothesis was the hypothesis which suggested that the produced offspring possess the intermediate characteristics of both the parents. This means that if the tall male and short female are crossed then the offsprings will have intermediate height.
This theory was well accepted at the time of Gregor Mendel and the Charles Darwin. This theory has limitation as the breeding population offsprings will have the uniform characteristics and the unformatism will be established.
Thus, Option-C is correct.
In negative geotropism of shoots, auxin is redistributed to the ______ side of the cell, where the amyloplasts have accumulated, where it ______ cell elongation.
Answer:
a. Lower
b. Stimulates
In negative geotropism of shoots, auxin is redistributed to the lower side of the cell, where the amyloplasts have accumulated, where it stimulates cell elongation.
Explanation:
Geotropism can be defined as the direction the various parts of a plant grows toward due to the stimulus which in this case is the force of gravity. Geotropism in plants can be negative or positive.
Negative geotropism occurs when the shoots of a plant grows upwards against the force of gravity.
Answer: downward or lower side : triggers and stimulates
Explanation: In negative geotropism, plant stem tends to move away from gravity. The stem bends upwards against the downward gravitational pull.
Plants stems have hormones called auxins which settle at the bottom/lower part of the cells and allow plants to sense gravity. The auxin also triggers elongation and growth in plant cells.
A small number of birds, blown off course during migration, find an island and colonize it. This population will most likely experience genetic drift as a result of __________. Choose the correct answer. Group of answer choices mutations sexual selection the founder effect the bottleneck effect
Answer:
Founder Effect
Explanation:
A founder effect in known to be occur when a new population of new colony develops by only a few members of a large original population. The new population comprising few members is called Founder Population. Here, in the question the blown off population of birds colonizes an island and becomes a new population there. This new population will be termed and Founder Population and the phenomena as Founder Effect.
What purpose does isopropyl alcohol serve in the process of dna extraction?
Answer:
The process of extracting the DNA is a very complex, time taking and tedious task. It needs lots of technical knowledge in order to extract DNA.
There are various chemicals used during the process of DNA extraction. The use of isopropyl alcohol is to precipitate the DNA.
This precipitation makes the DNA visible as it is clumped together. Then it becomes easy for the long strands of DNA to wrap around the stirrer when swirled at the interface between two layers.
Final answer:
Isopropyl alcohol is used in DNA extraction to precipitate DNA from an aqueous solution, making it visible as a white mass or gel-like substance that can be physically separated from other cellular components.
Explanation:
Isopropyl alcohol serves a key role in the process of DNA extraction by facilitating the precipitation of DNA from the solution. During DNA extraction, cells are first lysed using a solution with detergents to break open cell and nuclear membranes, followed by the use of enzymes like proteases and ribonucleases to inactivate and degrade proteins and RNA, respectively. After this treatment, isopropyl alcohol (also called rubbing alcohol) is added to the solution to precipitate the DNA.
Because DNA is not soluble in isopropyl alcohol, when it is added to the aqueous solution containing cellular contents, the DNA aggregates and becomes visible as a gel-like substance or white mass. This can be seen as white, precipitated strands which can then be collected, for example by spooling onto a glass rod. This precipitation step is crucial as it allows for the physical separation of DNA from other cellular components.