biology high school
answers
answer 1
Answer:
Feedback inhibition is one of the most important regulatory processes affecting enzyme activity.
Explanation:
There are many processes to regulate the activity of enzymes, such as
1 Suspension of the finished product
2 Equivalent modification
3 Feedback inhibit
Feedback inhibition In sequential enzyme-catalyzed steps, when the end product of a reaction inhibits the activity of the enzyme that catalyzes the first step of that reaction. This type of adjustment is called feedback inhibition.
Example During the de novo pathway of pyrimidine nucleotide biosynthesis, the end product cytosine triphosphate (CTP) inhibits aspartate transcarbamoylase function. This happens to maintain the hemostasis of various bioactive compounds present in our body.
Related questions
What part of the forebrain regulates the endocrine system and body temperature?
answers
The hypothalamus at the front of the brain regulates the endocrine system and body temperature.
Explanation:
- The hypothalamus connects the endocrine and nervous systems. It releases chemicals called neurotransmitters that help transmit signals between the endocrine glands and the brain.
- Activates and controls the production of hormones from the endocrine glands. The hypothalamus produces several hormones, such as thyrotropin-releasing hormone, oxytocin, vasopressin, and somatostatin.
- These hormones interact with the pituitary gland and further secrete hormones like TSH, FSH, LH, etc. respectively. So, the endocrine system is controlled by the hypothalamus.
- The hypothalamus plays a key role in maintaining homeostasis and maintaining an internal body temperature of 98.6 degrees Fahrenheit.
- The hypothalamus regulates body temperature by regulating sweat production and by controlling sympathetic tone to skeletal muscles and skin, which in turn regulates heat exchange.
- Ensures maintenance of normal internal body temperature.
Which of these structures forms a complete ring around the airway? hyoid bone
tracheal cartilage
cricoid cartilage
thyroid cartilage
answers
Tracheal cartilage.
Explanation:
The trachea is also known as the windpipe. It acts as a passage for air entering through the nasal cavity and migrating to the lungs. The trachea consists of tracheal rings. This ensures the flexibility of the air channel. The trachea divides into two bronchi that enter the left and right lung. It has a covering called the epiglottis that prevents food from entering during swallowing.
As the electrons pass through the electron transport system associated with photosystem II, they lose energy. What happens to that energy? A) It excites the electrons in the reaction center of photosystem I.
B) It is lost as heat.
C) It is used to create and maintain a proton gradient.
D) It is used to phosphorylate NAD+ to NADPH, a molecule that accepts electrons from photosystem I.
answers
Answer:
Option C) Used to create and maintain a proton gradient
Explanation:
After photons excite photosystem II, electrons from the main central chlorophyll are ejected to reach another energy level. Another molecule accepts these electrons and delivers them to the redox chain (also called the respiratory chain). Passing through this chain, the protons are pumped to the other side of the chloroplast membrane or equivalent and a proton gradient is created. This gradient will allow the production of ATP. This is the energy that must be used in the Calvin cycle.
Eventually, these electrons will arrive at photosystem I, where option D appears, that is, NAD+ will be phosphorylated into NADPH, which represents the reducing power of the Calvin cycle.
What is the difference between vascular and non-vascular plants?
answers
Answer:
presence or absence of xylem and phloem
Explanation:
a vascular plant has vessels to transport water and food to all the different parts of the plant.
What brain structure transmits information from the eyes to the visual cortex?
answers
Answer:
Camera
Explanation:
The thalamus is a brain structure that originates in the diencephalon, it is the most voluminous structure in this region, and it is located in the center of the brain. The thalamus receives afferent neurons with sensory information, a special connection to the visual pathway is through the lateral geniculate body.
What structure separates the contents of the nucleus from the cytoplasm?
answers
The nuclear membrane separates the contents of the nucleus from the cytoplasm.
Explanation:
Two nuclear membranes form the nuclear envelope that separates the nuclear content from the cytoplasmic content of the cell. They continuously interact with the endoplasmic reticulum, which closes the perinuclear space between them. The nuclear membrane contains nuclear pores that control the entry and exit of molecules entering and leaving the nucleus.
Cellular respiration is necessary for most living cells because
answers
Answer:
It breaks down glucose from sugar and stores its energy in molecules of adenosine triphosphate.
Which of the following two groups is adapted to anaerobic conditions and contains modified mitochondria that lack DNA? dinoflagellates and diatoms
chlorophyta and radiolaria
apicomplexani and forums
gymnamebs and mucosa
diplomats and lovers
answers
Diplomonas and Parabasalids are two groups that are adapted to anaerobic conditions and contain modified mitochondria that do not have DNA.
Answer: Option E
Explanation:
Two groups of Protista are adapted to anaerobic conditions. They are adapted to life without oxygen or even die in the presence of free oxygen. These are two groups called diplomats and paravassals.
They have modified mitochondria that do not have DNA. Diplomonas is an internal parasite that causes beaver fever caused by contaminated water. Pinworms are parasites of animals.
Why is cell differentiation necessary for the survival of multicellular organisms?
answers
Answer:
Cellular differentiation is necessary for the survival of multicellular organisms because all organisms initially start from a single cell called a zygote. This zygote undergoes mitosis and forms many uniform cells that have no specific function.
The differentiation of these cells is necessary for the development of specific organs and organ systems from that single cell. Cell differentiation is an important process that gives cells in the body a specific function.
What happens when a neuron sends a signal?
answers
Answer:
do you agree
Explanation:
Neurons or nerve cells are electrically excitable cells that process and transmit information through electrochemical signals. This information that flows from one neuron to another is called a synapse and consists of a presynaptic terminal that contains neurotransmitters, mitochondria, and other cell organelles, a postsynaptic terminal that contains receptor sites for neurotransmitters, and finally the synaptic cleft, or space between the presynaptic and postsynaptic terminals. .
I hope you find this information interesting and useful! Good luck!
The antigen-presenting cell presents the antigen to the so-called helper lymphocyte.
answers
Answer:
The antigen that presents cellular antigens to the helper lymphocyte is called a macrophage.
Explanation:
Macrophages belong to a family of antigen-presenting cells. Together with the help of low molecular weight protein cytokines, macrophages migrate to the site of inflammation. Once they reach that point, the macrophages engulf the antigen and destroy it in a process called cytophagy or phagocytosis.
The antigenic fragments are then presented to the helper T cell with the help of a protein molecule known as the major histocompatibility complex, or MHC.
Three Importances of Soil Air
answers
Answer:
Explanation:
The soil provides plants with essential minerals and nutrients. Soils provide air for gas exchange between the roots and the atmosphere. Soil protects plants from erosion and other destructive physical, biological, and chemical activities. Soils retain water (moisture) and maintain adequate aeration. And a conspiracy theorist astronaut doesn't believe the moon or air exist lol hope this helps
Where are you most likely to find shared electrons in a water molecule?
answers
Answer:
You will most likely find the shared electrons in a water molecule closer to the oxygen atoms.
What is the effect of emulsifiers on lipid digestion?
answers
Answer:
An emulsifier generally reduces the surface tension of lipids and aids in the digestion of lipid molecules.
Explanation:
The bile secreted by the liver acts as an emulsifier because bile helps break down lipids into small molecules to form micelles, which lowers the surface tension of lipid molecules.
Due to the formation of micelles, the cleaved lipid molecules bind to the active site of the lipase enzyme and are digested into fatty acids and glycerol.
In addition to digestion, the bile emulsifier also aids in the absorption of lipids from the small intestine.
Which of the following is a way that muscle fibers get the energy they need to contract? 1) When a muscle contracts during maximal activity, it quickly uses up the stored creatine phosphate that is produced during moderate exercise. 2) During moderate exercise, such as running on a treadmill, hydrogen and pyruvate ions accumulate and cause muscle fatigue. 3) During peak levels of activity, glycolysis is the only route by which ATP can be produced to power muscles. 4) Because energy demands are low in resting muscle, resting muscle can meet its ATP needs through glycolysis. 5) Aerobic exercise is beneficial to muscle because it increases the muscle's ability to obtain greater amounts of glucose from the
answers
Answer:
The correct choice is number 3.
Explanation:
ATP serves as the main energy molecule in our body. Although our body can store ATP, the need for energy during times of high activity or exercise is greater compared to the amount of ATP stored. Therefore, our body tends to produce ATP in the glycolysis cycle. In glycolysis, glucose is broken down to produce pyruvate molecules with the release of ATP (energy) molecules.
The neuromuscular junction is the junction between the _________ and the ___________.
answers
Answer:
A neuromuscular junction is a junction between a nerve fiber and a muscle cell.
Explanation:
A neuromuscular junction (or myoneural junction) is a site of chemical communication between a nerve fiber and a muscle cell, analogous to a synapse between two neurons.
A motor neuron can transmit a signal to a muscle fiber, causing the muscle to contract after being stimulated by a nerve impulse, the terminal releases the neurotransmitter chemical acetylcholine from synaptic vesicles attached to receptors, channels open, and ions As sodium flows into the end plate, this triggers an end plate potential, an electrical event that leads to contraction of muscle fibers.
I hope you find this information useful and interesting! Good luck!
Pseudostratified epithelia are well adapted to the digestive system because the cilia increase the surface area for absorption. Right or wrong?
answers
Answer:
The answer is false.
Pseudostratified epithelia are found on the respiratory mucous membranes. The cilia are used for movement, not for increasing area.
I hope that helps. :)
https://quizlet.com/123755244/ap-chapter-4-test-flash-cards/
An action potential causes the release of neurotransmitters in the ______. A. myelin sheath. B contract person c. D. synaptic vesicle
answers
An action potential causes the release of neurotransmitters at synapses.
What are neurotransmitters?
The action potential travels along the axon and reaches the terminal buttons of the synapse. This triggers the release of neurotransmitters stored in synaptic vesicles into the synaptic cleft, where they can bind to and activate receptors on the postsynaptic neuron or muscle cell.
Neurotransmitters then facilitate the transfer of information from one neuron to another, helping to regulate the electrical and chemical activity of the nervous system. The myelin sheath is a layer of insulating material that surrounds certain axons and helps speed the conduction of action potentials.
Learn more about neurotransmitters here:
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answer: c i think
Explanation:
What structure do prokaryotic and eukaryotic cells have?
answers
Answer: both cells have a common structure. All cells have a plasma membrane, ribosomes, cytoplasm, and DNA.
Explanation:
Which of the following is NOT a benefit of breathing through the nose? 1) removal of heat and moisture from the air leaving the nasal cavity 2) destruction of pathogens entering the nasopharynx 3) filtration of air entering the nasal cavity 4) heating and humidification of air entering the nasal cavity
answers
Answer: Option A
Explanation:
The main purpose of breathing through the nose is to ensure the optimal quality of air that the body requires.
Air entering the nasal passage becomes humid and warm as it passes through the nasal cavity.
As it travels through the passage, pathogens are shed by the mucus found in these areas.
In this way, air from the nasal passage is filtered. So the correct answer is option A.
Answer:
The answer is:
2) Destruction of pathogens entering the nasopharynx.
I hope that helps. :)
FAQs
How does feedback inhibition affect enzyme activity? ›
In feedback inhibition, binding of the end product to the allosteric site slows down or stops the enzyme's activity so that little or no new end product is produced. When levels of the end product drop, the enzyme will encounter fewer particles of the end product and its activity will increase again.
What is feedback inhibition of enzymes? ›feedback inhibition, in enzymology, suppression of the activity of an enzyme, participating in a sequence of reactions by which a substance is synthesized, by a product of that sequence.
What happens in feedback inhibition quizlet? ›Feedback inhibition allows cells to control the amounts of metabolic products produced. If there is too much of a particular product relative to what the cell's needs, feedback inhibition effectively causes the cell to decrease production of that particular product.
How does feedback regulation regulate enzyme activity? ›In the process of feedback inhibition, the end product of a metabolic pathway acts on the key enzyme regulating entry to that pathway, keeping more of the end product from being produced.
How does enzyme feedback inhibition benefit a cell quizlet? ›How does enzyme feedback inhibition benefit a cell? Feedback inhibition benefits the cell by blocking the production of the products by changing the configuration of enzymes. This will prevent the cells from becoming toxic.
What does feedback inhibition mean simple? ›feedback inhibition. noun. : inhibition of an enzyme controlling an early stage of a series of biochemical reactions by the end product when it reaches a critical concentration.
What is feedback inhibition and give an example? ›In feedback inhibition, the level of a variable is monitored, and a change in the positive direction triggers a response that counteracts the change. A simple example of feedback inhibition is a thermostat connected to a heater.
Which can affect feedback inhibition? ›Feedback inhibition usually occurs when the accumulation of a product is more than the optimal amount. Substances which bring about reversible changes are called modulators/site effector/allosteric substances. Allosteric modulators are of two types for activation and inhibition.
Which of the following describes feedback inhibition? ›Answer and Explanation: The correct answer is (b) The product of the pathway inhibits its own production by competitively inhibiting the binding of a substrate to the active site of an enzyme within the metabolic pathway.
Why is it called feedback inhibition? ›Allosteric inhibition is called feedback inhibition because in feedback inhibition, the end products of a reaction are known to bind to the allosteric site of the enzyme leading to the inactivation of enzyme thereby producing a lesser amount of products.
How does enzyme feedback inhibition benefit a cell? ›
Feedback inhibition allows cells to control the amounts of metabolic products produced. If there is too much of a particular product relative to what the cell's needs, feedback inhibition effectively causes the cell to decrease production of that particular product.
What factors affect enzyme activity? ›Enzyme activity can be affected by a variety of factors, such as temperature, pH, and concentration. Enzymes work best within specific temperature and pH ranges, and sub-optimal conditions can cause an enzyme to lose its ability to bind to a substrate.
Does feedback inhibition regulate respiration? ›Feedback inhibition regulates glycolysis. Cellular respiration is a multi-step process, including glycolysis, the citric acid cycle, and oxidative phosphorylation. Like many biochemical pathways, it's controlled in part by feedback inhibition: ATP, the end product of OXPHOS, inhibits the beginning of glycolysis.
What is the general purpose of feedback inhibition quizlet? ›The general purpose of feedback inhibition is to regulate the concentration of compounds in the cell. If feedback inhibition occurs when it isn't supposed to, the concentration of the compound being regulated may decrease to levels that are detrimental to the cell.
Why is feedback inhibition important for regulating the activity of metabolic enzymes? ›Answer and Explanation: Feedback inhibition is important for the metabolic pathways because this process restricts the pathways from producing excessive amounts of products (nucleic acids, proteins, and other essentials) and by-products.
What is positive and negative feedback inhibition? ›Negative feedback results in the inhibition of an enzyme in a biochemical pathway, reducing the activity of earlier enzymes, and stopping the pathway. Positive feedback results in the activation of more enzymes, thus increasing its production of the product.
What is feedback inhibition AP biology? ›Feedback inhibition is when the end product of a biochemical reaction works to block the activity of the original enzyme. Enzymes can be influenced by reaction conditions such as high temperatures, detergents, or acidic/basic conditions.
What is feedback inhibition in respiration? ›ATP, for instance, is a "stop" signal: high levels mean that the cell has enough ATP and does not need to make more through cellular respiration. This is a case of feedback inhibition, in which a product "feeds back" to shut down its pathway.
What is the difference between feedback inhibition and allosteric inhibition? ›Negative feedback inhibition occurs when the product of a biological reaction stops the reaction from continuing to occur. Allosteric Inhibition is the binding of a regulatory molecule to a separate (allosteric) site turning the enzyme off by changing the shape of the enzyme's active site.