Answer:
its the nuclei in a sample
Explanation:
Answer: The correct answer is the nuclei in a sample.
Explanation:
Half life is defined as the time taken for half of the reaction to complete. This is also defined as the time in which the concentration of a reactant is reduced to half of its original value.
General expression for half life period of a reaction for nth order is: [tex]t_{1/2}=\frac{1}{[A_0]^{n-1}}[/tex]
where, n = order of the reaction
Hence, the correct answer is the nuclei in a sample.
The Chesapeake Bay is an important natural resource. Over the years, the number of oysters in the bay has declined dramatically, largely because of fishers who catch them and sell them as food. This has affected many other organisms that depend on oysters. This is an example of which type of short-term human-induced environmental change?
A.eutrophication
B.non-sustainable harvesting
C.nonnative species introduction
D.pollution
Answer: B. Non-sustainable harvesting.
Explanation:
Non-sustainable harvesting is a practice in which the resources are consumed in a way that not appreciable amount is left. This is a short term human induced environmental change. Such a change may last for a short period of time and the damge caused by the change will be recovered by the environmental conditions.
The oyster population which is being overexploited due to non-sustainable harvesting by fishing and depleted will recover in future with the few remaining members of the population. Hence, it is a short term human induce change.
Identify three limiting factors that can prevent a population from increasing. Explain how each factor limits a population's size
Answer:
natural disasters,emigration and scarcity of food
Explanation: natural disasters: this affect population where by organisms leave there area or habitat for another area due to unfavorable conditions eg. flood, bush fire, storms, earthquake etc. and can also lead to death.
Emigration:this is when organisms leave an area for another either in search of food, breeding purpose this reduses population where by organisms may never return.
scarcity of food:this occur when there is insufficiency or no food in an area which makes organisms leave their habitat for another in search of food and might even lead to death.
The growing polypeptide chain is inserted into the membrane of the blank before being sent to its final destination
endoplasmic reticulum
Which of the following sequences of events correctly describes the progress of a protein that will be secreted from the cell?(A) SRP binds to the growing polypeptide chain and to the ribosome.(B) Translation resumes.(C) SRP binds to its receptor.(D) The signal sequence is cleaved.(E) Protein synthesis begins in the cytosol.(F) Translation pauses.•E → A → F → C → B → D•E → F → A → C → B → D•C → F → A → B → D → E
Answer:
E - F - A - C - B - D
Explanation:
After the export of mRNA from the nucleus, translation (protein synthesis) begins in the cytosol. Proteins that should be secreted from the cell, must e targeted to the endoplasmic reticulum (ER) and this process occurs co-translational (while translation is still in progress).The signal recognition particle (SRP) is involved in the process of targeting, because it recognizes specific signal sequences in proteins and targets that protein to the endoplasmic reticulum (SRP binds to its receptor in the membrane of the ER).
How many aminoacyl-tRNA synthetase enzymes must be present in cells to properly synthesize proteins?
A., 3, one for each base in a codon
B., 4, one for each base in the mRNA
C., 20, one for each amino acid
D., 64, one for each possible codon
Answer:
C. 20, one for each amino acid
Explanation:
Aminoacyl-tRNA synthetase is an enzyme involved in protein synthesis (translation) with the role to attach suitable amino acid on its tRNA (amino acid that correspond to the anticodon on tRNA). As a result of its action, aminoacyl-tRNA is formed. There are the 20 different types of aminoacyl-tRNA synthethases that make 20 different aminoacyl-tRNA one for each amino acid of the genetic code.
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Describe what you first see when you open the body cavity of the frog. What organs are obvious? Which organs may require a more thorough inspection?
Answer:
urinary bladder, large intestine, stomach, small intestine, right lung
Which of these diagrams best shows Kepler's model of the solar system?
Hi.
I believe the diagram that best shows Kepler's model of the solar system is the picture B, the sun is the center while the earth (and other planets) orbit in an equantless pattern
Answer:
Option D
Explanation:
According to the Kepler, the arrangement of solar system is heliocentric which means that the sun is at the centre and all other planet rotate around it.
As per Kepler’s first law - All the planet rotate around the sun in elliptical paths
As per Kepler’s second law - The radius vector wrt position of planet on elliptical orbit sweeps equal area.
As per Kepler’s third law - The cubes of the planets mean distances from the Sun is directly proportional squares of the sidereal periods
As per Kepler , the solar system arrangement would look like a way more similar to as shown in the option D
What type of cells tend to be damaged the most during chemotherapy and radiation treatments?
a. collagen and fibrous tissue
b. epithelial cells
c. nerve tissue
d. skeletal muscle cells?
c
you can notice that from many cases
Epithelial cells are the type of cells that are most prone to damage during chemotherapy and radiation treatments. This is due to their fast dividing nature, similar to cancer cells. While these treatments can harm healthy cells, they usually recover over time.
Explanation:The type of cells that tend to be damaged the most during chemotherapy and radiation treatments are b. epithelial cells.
Epithelial cells are the cells that line the surfaces of organs and structures throughout the body. They divide and replicate quickly, just like cancer cells. It is for this reason that they are more prone to be affected by chemotherapy and radiation therapies, as these treatments target fast-dividing cells.
Note that while chemotherapy and radiation therapies are effective in killing cancer cells, they also harm healthy cells, leading to side effects. However, healthy cells usually can recover from this damage over time.
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Each replication fork requires both leading and lagging strand synthesis because
Think of it as a zipper. The top zipper is the leading strand, the bottom is the lagging, and the actual zipper thing is the helicase unwinding the 2 parts. You need the top and bottom strands to have a replication fork
Identify the feature not unique to vertebrates.
A) vertebrae
B) backbone
C) skull
D) skeleton
The answer is skull
Answer:
Skeleton is the answer
Explanation:
Vertebrates have a skeleton made of bone and cartilage inside the body. Some invertebrates have an internal skeleton, but it is not made of bone.
Glycogen synthase is an enzyme important for making glycogen. In response to glucagon, glycogen synthase is Glycogen synthase is an enzyme important for making glycogen. In response to glucagon, glycogen synthase is 1.inactivated by removing a phosphate group (dephosphorylation). 2.activated by phosphorylation. 3.inactivated by phosphorylation. 4.activated by removing a phosphate group (dephosphorylation).
Answer:
3.inactivated by phosphorylation.
Explanation:
Glycogen synthase is an enzyme, glycosyltransferase that is involved in the conversion of glucose into glycogen. There are two ways of the regulation of glycogen synthase:
allosteric regulation- via glucose-6-phosphate, which is activator of the enzymeby phosphorilation-it deactivates the enzyme and it is triggered by glucagon from the pancreas.The regulation of glycogen synthase is very important for glycogen metabolism and glucose storage.
A population of rodents, called population A, lived together in harmony on a large landmass until one group of the population dispersed to a nearby island. Two million years later, the island population is split into two smaller, equal-sized populations when a river formed across the middle of the island. Now two new species have evolved on the island, A1 and A2. They have replaced the population from which they were derived. Which represents the phylogeny of the three extant species discussed in this scenario?
Answer:
Diagram K is the answer
Final answer:
The three extant rodent species, originating from population A, underwent allopatric speciation leading to species A1 and A2. This occurred due to habitat isolation and selective pressures. The phylogeny would show a divergence first between the mainland and island populations, then another split between A1 and A2 after a river separated them.
Explanation:
In the given scenario, allopatric speciation has occurred within a population of rodents, known as population A, leading to the evolution of two new species, A1 and A2. Initially, part of population A dispersed to a nearby island, separating them from the mainland population. Due to habitat isolation, the island population ceased reproduction with the mainland population and began to independently evolve. After two million years and the introduction of a river splitting the island habitat, the island population divided into two, preventing gene flow between the two groups.
This geographical separation instigated further allopatric speciation, resulting in the formation of two distinct species, A1 and A2. The phylogeny of these rodent populations would reflect their shared ancestry and subsequent divergences. Initially, population A from the mainland would be at the base of the phylogenetic tree. The branch then separates into the island population, which later bifurcates into two distinct branches representing species A1 and A2 after the formation of the river.
If old mountains are worn down over the course of millions of years, what is one of the primary reasons that mountains still exist?
A.
New mountains are created through tectonic and volcanic activity.
B.
New mountains are created from decomposition of plants and animals.
C.
New mountains are created from leaf litter.
D.
New mountains are created through city development.
A because tectonic and volcanic activity is how mountains are created. Also, the other options don’t make any sense for this question.
Tenzin, a 35-year-old female, is 5 feet, 8 inches and weighs 250 pounds. she works, goes to school, and has a 6-month-old baby. she has very little time to cook meals at home or to exercise. tenzin's mother had gestational diabetes when she was pregnant with tenzin, and tenzin had the same diagnosis with her recent pregnancy. because of this, tenzin is being monitored for the development of diabetes.
What is the question though?
Answer:
Are you asking about what the chances of her having diabetes or her child having diabetes? If so:
Explanation:
It matters on the family history. If her mother had it, and now she developed this in pregnancy, then it's heredity. The chances of her diabetes forming in her child is higher if the child is a girl and becomes pregnant, than if it was a boy.
Centromeres of sister chromatids disjoin and chromatids separate. Which phase does this event happen?
Answer:
Anaphase
Explanation:
Cohesin is a protein that holds sisters chromatids together. Anaphase begins with the cleavage of that protein, enabling centromeres to split, and the movement of sister chromatides (new daughter chromosomes) toward the poles.
During the anaphase, microtubules that are not attached to chromosomes elongate and push apart. This elongation makes the cell longer and separates the poles.
Which of the following would most likely increase the rate of photosynthesis?
A. Changing a plant's light source to a lower brightness
B. Decrease the availability of water to the plant
C. Decreasing the temperature within the plant's environment
D. Exposing a plant to a higher light intensity
Answer:
D. Exposing a plant to a higher light intensity
Explanation:
Increase in light intensity serves to increase the rate of photosynthesis when other factors are present in adequate amount. It is due to the fact that the first phase of photosynthesis includes light dependents reactions that results in synthesis of ATP and NADPH in light dependent manner. These two products serve in dark phase of photosynthesis. Therefore, increase in light intensity increases the rate of photosynthesis.
Option D, exposing a plant to a higher light intensity, is most likely to increase the rate of photosynthesis as light provides the necessary energy for the photosynthesis reaction to occur. Other factors like water availability and temperature also influence photosynthesis but in this case, their decrease could potentially slow down the process.
Explanation:In terms of photosynthesis, the process through which green plants and some other organisms convert light energy, usually from the Sun, into chemical energy for their growth and survival, one of the key ingredients is light. The intensity of this light can greatly affect the rate of photosynthesis. So, among the options provided,
D. Exposing a plant to higher light intensity
is likely to increase the rate of photosynthesis. This is because light provides the energy required for the photosynthesis reaction to occur.
Conversely, decreasing light intensity (option A), decreasing the availability of water (option B), or lowering environmental temperature (option C) could potentially slow down the process. For instance, in low light conditions or shade, a seedling may not have enough light to promote sufficient photosynthesis. The rate of photosynthesis can also fall when water or optimal temperature levels are inadequate, as these conditions may lead to the closure of stomata, resulting in a constrained intake of carbon dioxide, a key reactant in photosynthesis.
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During _____ both the contents of the nucleus and the cytoplasm are divided.
During the mitotic phase
The result of the following cross indicates the orange eyes are _____ black eyes.
the answer is recessive to.
The orange eyes in the fruit fly cross are recessive to black eyes. A cross between a white-eyed male and a heterozygous red-eyed female results in a 1:1 ratio of red to white-eyed offspring for both sexes.
Explanation:The result of the cross indicates that orange eyes are recessive to black eyes. In Drosophila (fruit flies), eye color is often used as an example of a sex-linked trait. In a cross between a homozygous red-eyed female fruit fly and a white-eyed male fruit fly, the expected outcome for the F1 generation would be all red-eyed offspring since red is dominant over white.
However, a cross between a white-eyed male (XY) and a female heterozygous for red eye color (XwXw) would result in different phenotypes for the different sexes: 50% of the female offspring would be heterozygous with red eyes, 50% of the female offspring would be homozygous with white eyes, 50% of the male offspring would have red eyes (hemizygous dominant), and 50% would have white eyes (hemizygous recessive), giving a 1:1 ratio of red to white eyes for both sexes.
However, some organisms get all of their genetic material from just one parent organism. When this happens, this is called _______ reproduction.
Asexual reproduction
Answer: asexual
Explanation: In asexual reproduction, all of the genes that an organism carries come from just one parent. This ordinarily happens when the parent organism simply divides to create offspring. Microscopic bacteria and yeasts undergo asexual reproduction.
URGENT PLZ HELP!!!!(70 POINTS!!!!) WILL MARK BRAINLIEST
I have to do this alternate assignment for Bio and i have no idea what to do, plz help.]
So i had to choose 8 pieces of furniture in my house and categorize it into "Kingdoms" and i did that, so now i have to categorize them into 4 diff phylums.
The chosen furnitures were:
computer desk, Tv, Home phone, PS4, books,Dining Table,Chair,Bed,Couch.
Answer:
Explanation:
Im pretty sure you just have to mae it into smaller categorys for exaple the home phone tv and ps4 wouuld be in 1 phylum and that phylum would be electronics and then it would be like that so forth and so forth.
Biomes on Earth have exhibited changes throughout history that have been caused by a variety of factors. Over the past 50 years, the amount of tropical rainforest acreage found throughout the world has decreased from 14.8 billion acres to 8.6 billion acres due to deforestation. What factor is likely most responsible for the changes observed in the world’s rainforests?
a.volcanic activity
b.human activity
c.temperature changes
d.solar eclipses
Answer:
b.human activity
Explanation:
Deforestation is a human-driven process of the tree removal. Destruction of forest is performed fro many reasons: urbanization of the land, industry, farms, wood and paper production etc. It increased over the past 50 years and the main target are tropical rainforests. The trees are burned or cut by humans who leave the destroyed ecosystem behind.
Deforestation affect the animals and plants that lived there, but also humans and the effect even have global consequence (global water cycles, warming).
The most responsible factor for the changes observed in the world's rainforests, particularly the decrease in acreage, is human activity, specifically deforestation. Deforestation, driven by agriculture and logging, has resulted in habitat destruction, loss of biodiversity, and increased carbon dioxide emissions. Conservation efforts and international agreements are being implemented to address this issue.
Explanation:The factor that is most responsible for the changes observed in the world's rainforests is human activity, particularly deforestation. Deforestation refers to the clearing of forests, often for agriculture, logging, or urbanization purposes. In the case of tropical rainforests, human activities such as logging and slash-and-burn agriculture have contributed significantly to the loss of acreage.
For example, in the Amazon rainforest, one of the largest tropical rainforests, deforestation has been driven by the expansion of cattle ranching and soybean farming. Trees are cut down to make space for grazing pastures or to plant soybeans. This widespread deforestation has resulted in habitat destruction, loss of biodiversity, and increased carbon dioxide emissions, contributing to climate change.
To mitigate and address the issue of deforestation, conservation efforts, sustainable land management practices, and international agreements such as the REDD+ program have been implemented to promote the preservation of tropical rainforests.
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One serving of chunk light tuna in water contains 0.5 g of fat. the total food calories in one serving is 60. what percentage of calories come from fat?
Answer:
approximately 4.5
Explanation:
According to https://healthyeating.sfgate.com/gram-protein-carbohydrates-contains-many-kilocalories... , there is 9 calories per 1 gram of fat, therefore there is 4.5 per .5 gram.
Which of these is NOT a solution that will reduce run-off water pollution: A) Farmers switching from chemical to organic fertilizer. Eliminate B) Taking local transit instead of driving whenever you can. C) Making sure to clean pet waste up and dispose of it properly. D) Making sure your car does not leak oil by getting regular tune-ups and checks.
Answer:
B
Explanation:
Oil from gas and cars does not contribute much to run off pollution. It mostly pollutes the air as it is used.
Answer:
its B i got it right with my usatestprep i got 100%
Explanation:
Which of the following statements correctly describes the effect a nonsense mutation would have on a gene?a) It changes an amino acid in the encoded protein.b) It alters the reading frame of the mRNA.c) It introduces a premature stop codon into the mRNA.d) It has no effect on the amino acid sequence of the encoded protein.
C. It introduces a premature stop codon
The greatest expression of the lac operon occurs when lactose levels are _____.
A) low and glucose levels are lowB) low and glucose levels are highC) high and glucose levels are lowD) high and glucose levels are high
D.
Lac operan starts at an off position until a substance like allolactos turns in on so the rna polymerase can go through
Final answer:
The maximal expression of the lac operon occurs when lactose is high and glucose is low, as this allows for increased cAMP which enhances transcription and the presence of lactose inhibits the repressor.
Explanation:
The greatest expression of the lac operon occurs when lactose levels are high and glucose levels are low. This is because a low glucose concentration results in a high level of cyclic AMP (cAMP), which, when bound to the catabolite activator protein (CAP), enhances the binding of RNA polymerase to the lac operon promoter, thus increasing transcription. Furthermore, the presence of lactose results in the production of allolactose, which acts as an inducer by binding to the lac repressor and disabling its ability to bind to the operator site, thereby preventing it from blocking transcription of the operon. Jointly, these conditions significantly derepress the lac operon, leading to its maximal expression.
How is it possible that regions thousands of base pairs from a promoter can impact transcription of that gene?
A. DNA is capable of looping, bringing distant regions in the same proximity.B. Proteins can be very large molecules, much larger than a nucleotide.C. Transcription factors work in complexes, creating large chains of proteins.
Answer:
A. DNA is capable of looping, bringing distant regions in the same proximity.
Explanation:
Transcriptional factors (such as activators or repressors) are proteins that regulate gene expression by binding to DNA sequence (such as enhancers and silencers). Consequently, gene transcription might be turned on or off. Usually binding sites for transcriptional factors are located near the promoter (initiation of transcription). But when they are located far from the gene they regulate DNA, flexibility plays a role. DNA can form loops which bring together binding sites and transcription factors.
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Is water a renewable or non-renewable resource?
A.Clean water enters the Earth system from rainfall and replenishes much faster than it is used, so it's renewable.
B.Water can be filtered for reuse, and cycles through Earth in the hydrologic cycle, so it is renewable.
C. There is so much fresh clean water on Earth that humans will never be able to use all of it, so it is non-renewable.
D.We cannot clean water effectively when it is polluted, so it is completely non-renewable.
B what we can be filtered for reuse, and cycles through earth in hydrologic cycle, so it is renewable
Because, water is recycled through this process it is neither gained or lost because it reuses the water to become renewable and humans and use a filter to clean water with specific chemicals that don’t harm humans and take all the pathogen or “germs” away to be able to drink safely for humans.
Answer: B
Explanation:
What can still be cleaned after being polluted as we today and while water does come down through rainfall it goes through a whole cycle. Also remember that matter can not be created or destroyed but it changes forms
Thermal energy does not depend on an object’s
Answer:
specific heat. Thermal energy depends on phase, mass, and temprature of an object.
Please select the word from the list that best fits the definition Occurs when the rotation of the Earth causes air movement to curve
Answer:
Coriolis effect
Explanation:
The rotation of the Earth is one of the climate modifiers. Considering the speed of the rotation, it is no wonder that it manages to influence the air masses and their movement in the lower atmosphere. Because of the rotation of the Earth, the air masses tend to swirl counterclockwise in the Northern Hemisphere, and clockwise in the Southern Hemisphere. This process is causing lot of large cycles to occur on both hemispheres, and it is known by the term Coriolis effect.
Easily Coriolis effect. Hopes this helps.
The nonfunctional pelvis and hind limbs found in some snakes support which statement about evolution?
a) Snakes began to evolve these structures, but selection pressures did not favor them.
b) Mutations tend to make species evolve to resemble other species in their environment.
c) Snakes evolved from the same common ancestor as species in which these structures are functional.
d) Selection pressures promoting snake evolution ceased before snake anatomy was well adapted.
Answer:
The answer is C. Snakes evolved from the same common ancestor as species in which these structures are functional.
Explanation:
The organs which apparently have no functional role in an organism but thought to be functional in past are called Vestigial Organs. One common example is the non functional Pelvis and hind Limbs in snakes. It is thought that snakes have evolved from reptiles. From fossil record it was predicted that many snakes like species were present in past and they had the pelvic bones while due to adaptation to the changing environment they lost the functional bones and evolved as snakes.