Answer:
1/2
Explanation:
This is a cross involving a single gene coding for sickle cell resistance (S) where the dominant allele is denoted by S and the recessive allele by s. Hence, an individual heterozygous will have a Ss genotype. According to the question, an individual with Ss genotype (heterozygous) will be phenotypically normal and resistant to malaria attack.
A cross between a homozygous normal male (SS) and heterozygous female (Ss), using a punnet square, will give rise to four possible offsprings with genotypes: SS, SS, Ss and Ss.
The SS genotype is phenotypically normal but not resistant to malaria while the Ss genotype is also phenotypically normal but resistant to malaria. Hence, the probability of their single child being phenotypically normal (not having sickle cell) and resistant to malaria is 2 out of 4 possible offsprings i.e. 2/4 = 1/2.
The child of a homozygous normal father and a heterozygous mother for sickle cell anemia has a 50% chance of being heterozygous and therefore resistant to Malaria without having sickle cell anemia. However, being heterozygous does not guarantee complete protection against Malaria.
Explanation:In this case, we are looking at a genetic disorder, sickle cell anemia, where the heterozygous condition provides a built-in resistance to Malaria. A person with a heterozygous sickle cell condition has one normal hemoglobin gene (H) and one abnormal hemoglobin gene (S), which results in some resistance to Malaria.
If a father is homozygous normal (HH) and a mother is heterozygous (HS), the possibilities for their child's genotype through Mendelian inheritance are HH or HS, according to Punnett square analysis. Therefore, the child has a 50% chance of being heterozygous and thus resistant to Malaria without having sickle cell disease.
Yet, it's important to note that being heterozygous for sickle cell trait does not guarantee 100% protection against Malaria, but it does increase survival rates in malaria-endemic regions.
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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.
The African finch Pyrenestes is an example of A. guided selection. B. stabilizing selection. C. uniform selection. D. directional selection. E. diversifying selection.
Answer:
E. diversifying selection.Explanation:
Natural selection is a mechanism that plays an important role in the process of evolution. On the basis of factors and mechanisms, it is classified into many classes such as diversifying selection, directional selection and some other.
Diversifying selection is such kind of natural selection that favored extreme values of the trait on intermediate values. It is also called as disruptive selection.
The African finch Pyrenestes exemplifies diversifying selection, which favors multiple distinct phenotypes within a population, leading to a wide range of advantageous traits such as variations in beak size.
The African finch Pyrenestes is an example of E. diversifying selection. Diversifying selection, also known as disruptive selection, occurs when natural selection favors two or more distinct phenotypes within a population, often leading to greater genetic variance. In the context of Pyrenestes finches, this form of selection has resulted in significant variation in beak size among individuals within the same species, primarily due to the different types of seeds available as food sources in their environment. Some finches have evolved larger beaks suitable for cracking hard seeds, while others have smaller beaks ideal for softer seeds, illustrating how diversifying selection encourages a range of advantageous traits.
The pH of coffee is _____ times greater than the pH of pure water.
A) 2
B) 10
C) 100
D)200
Answer:
a) 2
Explanation:
the pH of coffee is 5 and the pH of water is 7, 7-5=2
Answer:
A) 2
Explanation:
Fill in the blanks.1. The specific location within an enzyme molecule where the substrate binds is called the:_______ . 2. During an enzymatic reaction, a molecule of binds to the enzyme and is broken down into one or more molecules of , __________which are released. 3. A_____________ is a molecule that can bind to an enzyme and prevent the enzyme from working. 4. Lactose takes years to break down on its own. But if exposed to the protein lactase, the reaction proceeds very quickly, while lactase itself remains unchanged. Lactase is an example of a_____________ . 5. The___________ between an active site and its substrate often strains bonds and helps the reaction proceed.
Answer:1. enzymes active site, 2. substrate, 3. inhibitor, 4. an enzyme, 5. induced fit
Explanation: hope this helps
The terms required to fill in the blanks in the student's question are, in order, 'active site', 'substrate', 'products', 'inhibitor', 'catalyst', and 'interaction'. This is in regard to the biological process of catalysis by enzymes.
Explanation:1. The specific location within an enzyme molecule where the substrate binds is called the: active site. 2. During an enzymatic reaction, a molecule of substrate binds to the enzyme and is broken down into one or more molecules of products, which are released. 3. An inhibitor is a molecule that can bind to an enzyme and prevent the enzyme from working. 4. Lactose takes years to break down on its own. But if exposed to the protein lactase, the reaction proceeds very quickly, while lactase itself remains unchanged. Lactase is an example of a catalyst. 5. The interaction between an active site and its substrate often strains bonds and helps the reaction proceed.
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a cell will usually undergo apoptosis if the cell experiences dna damage that could lead to a tumor. Predict what may happen if a gene that controls apoptosis is damaged
Answer:
P⁵³ gene called as tumor suppressor gene is responsible for apoptosis.
Explanation:
The protein which encodes the gene belongs to a family of protein that have 3 members P⁵³,P⁶³ and P⁷³.
P⁵³ is known as tumor suppressor protein that is responsible for apoptosis of cells.
This protein is encoded by TP53 gene.This is important and play a crucial role in cell cycle an thus functions as tumor suppressor which involved in preventing cancer.Thus it is called called as "Guardian angel gene".
It not only function as anti cancer but also participate a crucial role in apoptosis,genomic stability and inhibition of angiogenesis.
It can also activate certain proteins that are which helps in DNA repair process.
Answer:
If damage is beyond repair the cell will normally send itself into apoptosis, ensuring that it will not pass on its damaged DNA.
Explanation:
A cell with three pairs of chromosomes has the genotype Aa Bb Cc, with each locus on a different chromosome. If this cell were to undergo mitotic division, how many genetically different types of daughter cells could be produced?
Answer:
Same type of daughter cells
Explanation:
The process of mitosis form two daughter cells with the same number of chromosomes but the meiosis form four different daughter cells with a different number of chromosomes.
Also, the meiosis produces genetically different cell as the meiosis I is marked with the crossing over events which produces different genetic combination in the cell. In the given question, since the cell divides with the mitosis therefore the daughter cells will be produced with the same type of genetic material.
Thus, the same type of daughter cells is correct.
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Cortisol is a useful adrenal hormone because it _____.
a. always is part of a negative feedback loop
b. ensures that adequate glucose is available to the brain when needed
c. causes all cells to take up glucose
d. reduces the size of the hippocampus
e. cannot be subject to overproduction
Your friend just spent a day at the beach but forgot to use sunscreen. That evening, she complains of a great deal of pain, and you notice that her skin is red and beginning to form large blisters. What type of burn has she suffered?
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
Insulin A) is released during fasting periods, such as between meals. B) increases blood glucose levels after meals. C) stimulates cells to break down glycogen for energy. D) helps glucose enter cells.
Answer:
The correct answer is D) helps glucose enter cells.
Explanation:
Insulin is a hormone that is released by the beta cells of the pancreas. It is released when the glucose level in the blood gets increase from its normal level.
Insulin helps in reducing the blood glucose level by making the blood glucose to enter the cells so that the blood sugar level gets to normal level and cells can get energy. Insulin also helps in storing glucose in the form of glycogen in the liver and muscles. Glucagon is the hormone that works antagonistic to insulin.
Insulin is secreted by the pancreas in response to elevated blood glucose levels, often after a meal, and helps to reduce blood glucose by facilitating its uptake into cells and stimulating glycogen formation in the liver.
The hormone insulin has several functions related to blood glucose management. When blood glucose levels rise, for example after a meal, the pancreas releases insulin. This hormone helps to lower blood glucose levels by enhancing glucose uptake into cells like muscle cells and the liver, and by stimulating the liver to convert glucose into glycogen, which can be stored for later use. Insulin also increases the number of glucose transporters in the cell membranes, enabling more glucose to enter cells where it is used for ATP production, or converted into fat for storage.
Therefore, the correct answer to the question: Insulin A) is released during fasting periods, such as between meals. B) increases blood glucose levels after meals. C) stimulates cells to break down glycogen for energy. D) helps glucose enter cells, is D) helps glucose enter 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.
Put the events of a reflex arc in order from the first event through the last event. 1. CNS sends output via motor neurons to an effector. 2. Sensory neurons bring the stimulus to the CNS. 3. The muscle contracts. 4. CNS processes and integrates the information. 5. Sensory receptor detects the stimulus
Answer:
1. Sensory receptor detects the stimulus
2. Sensory neurons bring the stimulus to the CNS
3. CNS processes and integrates the information
4. CNS sends output via motor neurons to an effector
5.The muscle contracts
Explanation:
Reflex arc is the neuronal pathway by which a reflex is produced from a stimulus. The sensory receptors detect the stimulus and send the signal to brain through sensory neurons. The central nervous system integrate the information and send response through motor neuron which produce the physiological effect.
Example; The thermal receptors detect high temperature and send signal to CNS through sensory neurons. The CNS integrate the information and send signal to corresponding muscles such as blood vessels to dilate and sweat gland to activate through motor neurons.
The reflex arc begins with the detection of the stimulus by sensory receptors, which relay this information to the CNS via sensory neurons. The CNS processes and integrates the information (option 4)and then sends the instruction for response via motor neurons to the muscles which in turn contract eliciting the reflex action.
Explanation:A reflex arc is a neural pathway that controls an action reflex. The events of a reflex arc take place in a particular order to ensure a quick and appropriate response to a particular stimulus. Let's go through these events in sequential order:
Sensory receptor detects the stimulus: The reflex arc begins when the sensory receptor detects a harmful stimulus.Sensory neurons bring the stimulus to the CNS: The sensory neurons carry the information about the stimulus to the Central Nervous System (CNS).CNS processes and integrates the information: The CNS processes the information received and prepares the body for appropriate response.CNS sends output via motor neurons to an effector: The CNS sends motor impulses via motor nerves to the muscles.The muscle contracts: On receiving the signals from motor neurons, the muscles (effectors) contract which triggers the reflex action.so the correct option is 4.Learn more about Reflex Arc here:https://brainly.com/question/32286035
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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.
"Which of the following is evidence that mitochondria have an endosymbiotic origin? A. They contain their own DNA B. They produce ATP C. They are enclosed by a membrane D. Mitochondrial diseases are maternally inherited"
Answer:
A. They contain their own DNA
Explanation:
Mitochondria is a eukaryotic cellular organelle which is thought to be evolved by the symbiotic relationship between the prokaryotes and the proto-eukaryotes.
The mitochondria were once a free-living prokaryote which during the course of evolution was engulfed by the proto-eukaryote. They formed the symbiotic relationship with each other and the prokaryote evolved into the mitochondria.
There are many pieces of evidence which suggest the endosymbiotic hypothesis one of which is provided in the option is that they contain their own DNA just like the prokaryotes that is one circular DNA present in their cytoplasm not enclosed by the
Thus, Option-A is correct.
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.
describe the role of cellular respiration in a plant???
Answer:
The process of cellular respiration allows plants to break down glucose into ATP.
Explanation:
Although plants use photosynthesis to produce glucose, they use cellular respiration to release energy from the glucose.
The epidermis receives blood containing oxygen and nutrients from ________
Answer:
From arteries in the connective tissue below.
Explanation:
The dermis is mainly divided into two regions Papillary region, and the Reticular region. These help to protect the body from strain, stress, also helps in a sense of touch, and elasticity to the skin.
Dermis lies under the epidermis. Dermis containing blood vessels that help to nourish the skin with nutrients and oxygen. The blood vessels also help to allow the immune cells to come in connect with the skin to fight with an infection. These blood vessels also help in carrying out waste products.
The epidermis receives blood containing oxygen and nutrients from the dermis through diffusion, as it contains no blood vessels itself. The dermis, which lies beneath the epidermis, has the necessary blood vessels to supply these vital substances. This process ensures that the epidermal cells get the nutrients required for their functions.
The epidermis receives blood containing oxygen and nutrients from the underlying dermis. The epidermis is the outermost layer of the skin and does not contain any blood vessels. Instead, it relies on the dermis, the thicker inner layer of the skin, which contains blood vessels that provide oxygen and nutrients through a process called diffusion.
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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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.
What are the characteristic of the domain bacteria?
Answer:
unicellular
Explanation:
Research suggests that during early and middle adulthood Group of answer choices crystallized intelligence decreases and fluid intelligence decreases. crystallized intelligence decreases and fluid intelligence stabilizes. crystallized intelligence increases and fluid intelligence decreases. crystallized intelligence stabilizes and fluid intelligence increases. crystallized intelligence increases and fluid intelligence increases.
Explanation:
Psychology has offered many theories about intelligence over the years, including ideas about how there are different forms of intelligence. Some people might be very high in all the different forms, some people might be relatively low across the board, and others might have an interesting mix. This lesson focuses on two specific types of intelligence, called 'fluid' and 'crystallized'Fluid intelligence is defined as the ability to solve new problems, use logic in new situations, and identify patternsUsing a complicated subway system in a new city is a good example of how you might need to use fluid intelligence. The first time you use the subway, you have to figure out the names of the stops you need, which train will take you there, if you need to transfer in the middle, and so on This type of intelligence is sort of like 'street smarts,' where you need to figure things out that moment and adapt to your situationIn contrast, Cattell also named a second, a different type of intelligence that he called crystallized intelligenceDuring early and middle adulthood, crystallized intelligence tends to increase or remain stable, while fluid intelligence peaks and then gradually declines. Engaging in stimulating mental and physical activities can help reduce the rate of cognitive decline.
Explanation:Cognitive Changes in AdulthoodResearch in cognitive aging has examined the differences between fluid intelligence and crystallized intelligence. Fluid intelligence, which includes abilities like problem-solving, memory, and information processing speed, tends to decline as we age. On the other hand, crystallized intelligence, which involves knowledge that comes from accumulated life experiences, generally increases or remains stable over time. This is exemplified in activities that rely on expertise or knowledge, such as crossword puzzles, where older adults often perform as well as or better than younger individuals.
Therefore, concerning early and middle adulthood, crystallized intelligence tends to remain steady or improve, illustrated by stable or increasing scores on intelligence tests up to mid-adulthood. Conversely, fluid intelligence peaks in earlier adulthood and then begins a gradual decline. Mental and physical activities have been shown to mitigate the rate of cognitive decline in areas of fluid intelligence, helping maintain cognitive function into older age.
The subdivision of the peripheral nervous system that consists of nerves that control all of the involuntary muscles, organs, and glands is called the ________ nervous system
Answer:
The Autonomic Nervous System is that part of PNS consisting of motor neurons that control internal organs. It has two subsystems. The autonomic system controls muscles in the heart, the smooth muscle in internal organs such as the intestine, bladder, and uterus.
The subdivision of the peripheral nervous system that controls involuntary muscles, organs, and glands is called the autonomic nervous system. It functions without our conscious awareness and is responsible for vital functions such as heart rate, breathing, digestion, and body temperature.
Explanation:The subdivision of the peripheral nervous system that consists of nerves that control all of the involuntary muscles, organs, and glands is called the autonomic nervous system. This system functions without our conscious awareness and is responsible for controlling vital functions such as heart rate, breathing, digestion, and body temperature. The autonomic nervous system can be further divided into two main branches: the sympathetic and parasympathetic nervous systems, which typically have opposing effects on the organs they innervate.
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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.
The niche of a species is the functional role of that species in the community that it belongs to. Species that have narrow niches (have very specific resource requirements) are said to be ________, while species that have broad niches (able to use a wide array of resources) are known as
Explanation:
Niche is the role played by an organism that how it lives in an environment
Specialists
Species that have narrow niches are called specialists and this type of niche is called realized nicheIt is narrow because of the presence of ecological barriers and is the space where a species actually livesGeneralists
Species that have broad niche are called generalists and this type of niche is called fundamental nicheIt is larger than the realized niche due to absence of ecological barriers It represents all the environmental conditions where a species is able to live or can live1. What is the percent increase in carbon dioxide in the atmosphere between 2015 and 2019? Between 1960 and 2015?
Answer:
2. Explain the fluctuation in the carbon dioxide levels each year.
CAN SOMEONE HELP ME WITH THIS? IT WORTH HALF OF MY GRADE I WILL GIVE BRAINLIST ASAP
Answer:
1. Between 2015. and 2019. is 2.977667493796526% and between 1960. and 2015. its 27.129337539432175%
2. Carbon dioxide fluctuation is a direct response due to photosynthesis and respiration increase in spring and summer and decrease in fall and winter
Explanation:
The percentage of carbon dioxide in the atmosphere varies. An WMO report shows that from 2015-2019, there has been a continued increase in carbon dioxide (CO2) levels and CO2 growth rates nearly 20% higher than the the other previous five years.
Studies has also shown that due to the annual growth rate of atmospheric carbon dioxide, it rate has been tripled. That is from 0.6 ppm per year in the early 1960s to an average 2.1 ppm in the past 10 years.The amount of CO2 found in the atmosphere is known to varies every year. Studies has shown that this variation is because of the role of plants in the carbon cycle.
Plants are known to use CO2 from the atmosphere when using the sunlight and water so that they can produce food and other substances that they need to survive and thrive.
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Pseudomonas aeruginosa causes the top of an open (aerobic) OF tube to turn yellow. However, an oil-covered (anaerobic) OF tube inoculated with the same strain remains entirely green. What is the best explanation for these results?
Answer:
This bacterial strain oxidizes glucose.
Explanation:
Pseudomonas aeruginosa belongs to the class of the gram negative bacteria and are found ubiquitous in nature. These bacteria can cause diseases in plant as well as in animals.
The bacteria has the ability to undergo the process of both the aerobic and anaerobic respiration depending on the availability of glucose. The presence of green color determines that the bacteria has oxidized the glucose present in the medium.
Retaining the zygote on the living gametophyte of land plants _____.
Answer: i would probaly go with C
Explanation:
In the reproduction of land plants, the zygote is retained within the gametophyte, which provides protection and resources for the growing embryo and developing sporophyte. This characteristic feature of embryophytes is vital for the protection of the vulnerable embryo from environmental hazards and is a unifying feature across all land plants.
Explanation:Retaining the zygote on the living gametophyte of land plants is a significant step in the reproductive cycle. This retention is a characteristic of all land plants, which are sometimes referred to as 'embryophytes' due to this very feature. The embryo that develops from the fertilized egg (zygote) remains attached to the gametophyte, not only ensuring a stable development environment with resources provided by the gametophyte but also protecting the developing sporophyte. Additionally, the female gametophyte sustains the zygote and eventually the young sporophyte, shielding it from environmental stressors like desiccation, further highlighting the critical role gametophytes play in nurturing the new generation of plants.
This process occurs in all plants and is analogous to the retention of the egg within the organism that produces it in some green algae. It is also observed in various other plant groups, where the entire female gametophyte is embedded in the diploid plant, a situation reminiscent of seed plants. The male gametophyte also shows retention, though temporarily, as microspores are kept within the microsporangium of the parent plant for initial development before being dispersed to complete its life cycle.
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What major body structures belong to the digestive system
Answer:
The major body structures belonging to the digestive system include: The mouth, esophagus, stomach, small intestine, large intestine and rectum.
Explanation:
The digestive system is one of the major body systems in humans. It is responsible for the intake, breakdown and processing of food for energy and other necessary nutrients needed by the body for survival.
The mouth play a vital role in the process of digestion. The teeth help to chew food into smaller bits, the tongue helps push food into the esophagus. The digestion of certain food class like carbohydrates begin in the mouth through the secretion of ptyalin.
The esophagus is the passageway where food passes to the stomach.
In the stomach, food is digested through the secretion of hydrochloric acid which is naturally found in there. The hydrochloric acid further helps breakdown food for easy absorption and also destroy pathogenic substances.
From the stomach food moves into the small intestine where the actual absorption of nutrients occur through it's walls. The small intestine is divided into the duodenum, ileum and jejunum.
From the small intestine food moves to the large intestine where further processing and secretion of waste is done.
The wastes then move into the rectum for excretion through the anus.
________ 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
An increase in blood glucose levels will lead to: All of these choices are correct. a breakdown of glycogen in the liver. increased insulin production. a breakdown of glycogen in the muscles. increased glucagon production.
Answer: increase in blood level of glucose will lead to increased insulin production.
Explanation:
Blood glucose level is the concentration of glucose (simple sugar) in the blood of humans and other animals. The body functions by regulating blood sugar level tightly as a part of body haemostasis.
Excess glucose intake in blood result to glucogen production (glycogenesis). A process whereby glucose is stored as glycogen in liver cells and skeletal muscles.
Blood glucose level is regulated by two hormones as part of haemostasis which are:
-Catabolic hormones (glucagon, cortisol and catecholamines)
-Anabolic hormones (insulin)
Glucagon responds to low level of blood glucose. It is secreted from alpha pancreatic cells. Once blood glucose level is low, it tells the tissues to generate more glucose by breaking down glycogen stored in skeletal muscles and liver cells.
Insulin is produced from beta pancreatic cells to respond to high level of glucose (simple sugar) in the blood. It lowers the level of blood glucose by informing the skeletal muscles and liver cells to take and store excess glucose as glycogen. Epinephrine gets the body muscles ready for 'fight and flight' response while cortisols generate the body fuel during stress.