Answer:
The correct answer is ''forms a channel in the target cell membrane that causes cytolysis.''
Explanation:
The membrane attack complex (MAC) has the essential effect of producing a notable osmotic imbalance in the microorganism that leads to its cytolysis (in Gram-negative bacteria it inserts into the outer membrane, favoring the entry of lysozyme, and in Gram-positive ones insert into the cytoplasmic membrane, destroying the electrochemical gradients). The lytic pathway corresponds to the final reactions of the complement system. It begins when the C5 convertase enzymes formed either in the classical pathway, MBL or the alternative, fix the factor C5 and fragment it into C5a (anaphylatoxin) that passes into the fluid medium and C5b, which binds non-covalently to C3b. The C5b fraction captures C6 and C7 from the fluid phase, forming a stable C5b67 complex with chemotaxic activity and membrane-binding capacity, which when joining the C8 fraction is cytolytic, and acquires the ability to interact with C9 molecules, forming the complex C5b6789. The C9 molecules then undergo conformational changes, enhance and accelerate the penetration of this membrane attack complex (MAC), giving rise to the formation of channels that allow the free exchange of sodium and water with the outside of the cell, causing the consequent osmotic lysis (cytolysis)of the attacked cell, since C9 is structurally homologous to perforin, a protein released by cytotoxic T lymphocytes and NK cells, and which is also responsible for the formation of pores in the membrane of the target cells.
Which type of organism must be at the bottom of food chains because of its structures for obtaining food energy?
A
Insects
B
Mammals
C
Plants
D
Fungi
The worst kind of self-love is
Altruistic
Narcissistic
Unconditional
Social
which one is it
Answer:
Narcissistic Love
Explanation:
Answer: narcisism is the only one that makes sense
Explanation:
What will most likely increase if there is a high death rate?
Answer:
Emigration
Explanation:
If there is a large number of deaths, then the population would move onto another area to find a mate, more food, and to be together to protect themselves from danger.
Hope this is what you were looking for, lmk if I can do anything else.
Your friend Chris is interested in studying rats. He usually feeds them seeds, which is their normal diet. Sometimes when they are very good eats, he gives them cheese as a treat. He notices that his best-behaved rats are also very fat. How can he prove that the cheese treats are the cause of this weight gain?
Answer:
using simple common sense we can see that the best preformed rats get more food, which makes them fat
Explanation:
Which example best represents the results of mitosis?
Check all that apply as characteristics of myelinated axons. Check All That Apply Myelinated axons transmit nerve impulses via continuous conduction.Myelinated axons transmit nerve impulses via continuous conduction. Myelinated axons transmit nerve impulses in the same manner as unmyelinated axons.Myelinated axons transmit nerve impulses in the same manner as unmyelinated axons. Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter.Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter. Myelinated axons are more energy efficient than unmyelinated axons.Myelinated axons are more energy efficient than unmyelinated axons. Myelinated axons would be unaffected by diseases that attack the CNS.
Answer:
Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter.
Myelinated axons are more energy efficient than unmyelinated axons.
Explanation:
Neurons are cells that specialize in transmitting messages to each other using a type of electrical signal. These signals carry information from outside your body to the brain, while others are the instructions for the various organs, glands and muscles to carry out functions.
Neurons receive these signals from other neighboring neurons through their dendrites. The signal then travels to the soma of the neuron, which is the main body of the cell, and finally travels down the axon to the synapse (space between the end of a neuron and another cell). The axon is a neuronal extension through which the electrical signal travels, extending from the soma to other neurons.
There may be layers of myelin, which consist of a layer of fat, covering the axons and where they have the function of acting as insulators to help keep the electrical signal inside the cell, which makes it move faster increasing the speed of transmission of the nerve impulse.
1) Myelinated axons transmit nerve impulses via continuous conduction. FALSE. In the axon, nodes of Ranvier are found at regular intervals along the length of the axon in the myelin sheath that surrounds it. These are small spaces that expose the axon membrane to the extracellular fluid and serve to allow the nerve impulse to travel faster, in a jumping manner and with less chance of error.
2) Myelinated axons transmit nerve impulses in the same manner as unmyelinated axons. FALSE. In an unmyelinated axon, the movement of voltage across the membrane is due to ion flux that is limited by the time it takes for sodium ions to diffuse into the axon. Myelinated axons conduct faster because they are shorter than unmyelinated axons. In the latter, transmission is continuous but slower.
3) Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter. TRUE. The action potential conduction jumps from node to node, thereby they need fewer voltage-gated channels. Unmyelinated axons need voltage-gated channels in along the entire axon.
4) Myelinated axons are more energy efficient than unmyelinated axons. TRUE. The rate at which sodium input through one node can depolarize the axon at the next node is related to the current and capacitance across the membrane. Myelinated axons have faster action potential conduction because it jumps from node to node, thereby they use less energy because they don't have to travel the entire length.
5) Myelinated axons would be unaffected by diseases that attack the CNS. FALSE. For example, Multiple sclerosis (MS) is a demyelinating disease of the CNS in which the immune system attacks the myelin sheath or the cells.
The correct statements are:
Myelinated axons transmit nerve impulses via continuous conduction.Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter.Myelinated axons are more energy efficient than unmyelinated axons.Myelinated axons are nerve fibers that are protected by a covering called myelin. In both the central nervous system (CNS) and peripheral nervous system (PNS), oligodendrocytes and specialized cells known as Schwann cells work together to generate the myelin sheath. This sheath is composed of several layers of lipids, which are fatty substances that wrap around the axon in segments, leaving small spaces known as nodes of Ranvier.
Therefore, the correct options are A, C and D.
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Your question is incomplete, most probably the complete question is:
Check all that apply as characteristics of myelinated axons. Check All That Apply
Myelinated axons transmit nerve impulses via continuous conduction.Myelinated axons transmit nerve impulses in the same manner as unmyelinated axons.Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter.Myelinated axons are more energy efficient than unmyelinated axons.Myelinated axons would be unaffected by diseases that attack the CNS.What does this quote mean to you?
Quote: “Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is $tupid.”-Albert
Answer:
It basically means that everyone is a genius in their own way and everyone has their own skills. If you decide to judge someone on what they cannot do (eg. a fish climbing a tree) rather than what they can do, it's gonna make the person feel $tupid their entire life. Not everyone can do the same thing and not everyone has the same abilities. A fish may not be able to climb a tree, but it can swim well. Just like a bee wouldn't be able to swim, but it can fly.
almost all frogs undergo external fertilization
In most species of frogs, fertilization is external. The male frog grabs the female's back and fertilizes the eggs as the female frog releases them. The sperm and egg die quickly unless fertilization occurs.
aid of diagram describe the biconversion of surfur cycles?
Answer:
The sulfur cycle describes the movement of sulfur through the geosphere and biosphere. Sulfur is released from rocks through weathering, and then assimilated by microbes and plants. It is then passed up the food chain and assimilated by plants and animals, and released when they decompose.
Check Your Understanding
Question: What is an adaptation?
Answer:
an adaptation can be defined as an inherited trait which confers an evolutionary advantage to the organism in a certain environment
Explanation:
An adaptation, also known as an evolutionary adaptation, can be defined as any physiological and/or morphological inherited trait related to the improved evolutionary fitness of one organism in a particular environment. An adaptation improves the chances of survival and reproduction in a certain environment, thereby organisms carrying the adaptation have more chances to produce descendants and pass their genes to the next generation. Some classical examples of evolutionary adaptations include the long necks of giraffes that help them to eat leaves at the top of trees, light bones of flying birds, etc.
Which of the following is not released by sweat glands?
A. Water. B. Salt.c.waste d.oil
Answer:
c. Waste
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Explanation:
Hatdog
Why are normally unseen members of the food web, such as soil microorganisms, essential to the nitrogen cycle?
Answer: Why are normally unseen members of the food web, such as soil microorganisms, essential to the nitrogen cycle? ... Since not all organisms can utilize the nitrogen gas directly, these microorganisms convert nitrogen in different nitrogen compounds, such as ammonia, nitrites, and nitrates. In this article we explore how nitrogen is cycled and the important role of microbes in this cycle. ... Nitrogen is required by all living organisms for the synthesis of organic molecules such as amino acids, nucleic acids and proteins. The Earth's atmosphere contains almost 80% nitrogen gas
Bacteria play a central role:
Nitrogen-fixing bacteria, which convert atmospheric nitrogen to nitrates.
Bacteria of decay, which convert decaying nitrogen waste to ammonia.
Nitrifying bacteria, which convert ammonia to nitrates/nitrites.
Denitrifying bacteria, which convert nitrates to nitrogen gas.
Explanation:
Potential energy is
a. Stored energy
b. Energy in motion
c. kinetic energy
d. moving energy
Which is the general equation for cellular respiration?
A. carbon dioxide + water + energy --> oxygen + glucose
B. glucose + energy --> carbon dioxide +oxygen + water
C. carbon dioxide + glucose --
--> water + oxygen + energy
D. glucose + oxygen --> water + energy + carbon dioxide
Answer:
D. glucose + oxygen ⇒ water + energy + carbon dioxide
Explanation:
The reactants of cellular respiration, or the substances that are used for the beginning of the chemical process, are sugar (glucose) and oxygen. The products, or the results of cellular respiration, are water, carbon dioxide, and ATP energy. Thus, D is the answer.
The general equation for cellular respiration is glucose + oxygen --> water + energy + carbon dioxide, which is in option D. So, here, the correct answer is option D.
Glucose is a sugar molecule that serves as the primary source of energy for cells. It is derived from the breakdown of carbohydrates in the diet or can be produced through other metabolic processes. Oxygen is required for cellular respiration as the final electron acceptor in the electron transport chain. It is obtained from the air through breathing or from other sources in organisms that do not respire aerobically. During cellular respiration, glucose and oxygen undergo a series of metabolic reactions in different stages, including glycolysis, the citric acid cycle, and oxidative phosphorylation. The correct option is option D.
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what is intrapersonal communication
the smaller the value of n the lower the energy and the closer to the orbital is to the nucleus true or flase
Answer:
True
Explanation:
This is because when you move across the periodic table, the number of atoms increase and the number of energy decrease downward. N represent energy level . n1 is the closest in the nucleus and n7 is the farthest. The farther the n in the nucleus, the higher the energy in the orbital. The smaller the n, the lower the energy and closer to the orbital.
A force of 5 N is required to increase the speed of a box from a rate of 1.0 m/s to 3.0 m/s within 5 s along a level surface. What change would most likely require additional force to produce the same results?
(SC.6.P.13.3)
reduce the mass of the box
increase the mass of the box
make the surfaces of the box smooth
make the surface of the floor smooth
HELPPP
Answer:increase the mass of the box
Explanation:
Big brain
The table lists some human activities. A student claimed that out of these activities, sleeping is the only activity in which energy is not needed by the cells. Is the claim made by the student correct? Explain.
Answer:
No
Explanation:
In every action you make you use energy, when you sleep you still have to breathe and regulate tempetaure. If you stopped giving energy to your cells as you sleep you not be able to breathe.
How “Competition in an ecosystem” is playing a role in life?
Sparrows produce an average of 5 eggs in each clutch. If there are more than 5. Parents can't adequately feed the young. if there are fewer. Predators may destroy the entire clutch. Which type of selection is this
Answer: it would be natural selection
Explanation:
Will give brainliest
Which best describes how limiting factors affect all the species in this ecosystem?
Answer:
Its a COYOTE
Explanation:
what are two good things that science has done for people and animals or the earth
Answer:
help provide better medical care and technology
Explanation:
medical as in antibiotics, vaccines and medical tools.technology as in how much has it made our lives easier (information is easily accessible and connecting with our is faster)explain why most high pressure air system form at the poles
Answer:
Subsidence
Explanation:
subsidence is a process where cold temperatures in the polar regions cause air to descend to create high pressure it's basically the difference in temperatures that make the pressure so high because hot atoms expand and becomes less dense and rise while cold air contracts and becomes more dense and falls. hope this helps
propose two ways the body temperature of a sick person can be brought to normal
Answer:
ice pack
Explanation:
Answer:
Swimming in cool water, taking a lukewarm bath, or applying cold water to the body can reduce body temperature.
Explanation:
hope this helps you!
Which factor would increase population size?
a. more competitors
b. unable to hide, defend, or migrate
c. ability to resist disease
d. inadequate food and resources
e. extreme temperatures
Answer:
c
Explanation:
All the others would begin to kill off a population
Deadly gas. Carbon monoxide is a colorless, odorless gas that binds to hemoglobin at an oxygen-binding site. Indeed, it binds 200 times as tightly as oxygen, accounting for its toxic nature. Even if only one of the four oxygen-binding sites on hemoglobin is occupied by carbon monoxide and the remaining three are bound to oxygen, oxygen is not released. Explain.
Answer:
The binding of carbon monoxide (CO) with hemoglobin leads to an R state even in conditions that should produce the release of oxygen. In consequence, CO-hemoglobin binding shifts the oxygen dissociation curve to the left.
Explanation:
Hemoglobin is a globular protein containing four heme groups that can bind to one oxygen each. This protein (hemoglobin) has two conformational states: the T-state, also known as deoxyhemoglobin (a tense state, where lacks O species), and the R-state, also known as oxyhemoglobin (a relaxed, fully oxygenated state). When carbon monoxide binds to hemoglobin, the protein can not release oxygen, shifting the oxygen dissociation curve -which expresses the percentage of oxygen saturation against the partial pressure of oxygen- to the left. Therefore, under CO-hemoglobin binding, the oxygen level in the tissues is reduced.
Which choice shows the correct order of the cell cycle?
A. Mitosis --> Cytokinesis --> Interphase
B. Mitosis --> Interphase --> DNA Replication
Answer:
correct order of the cell cycle? A
Question 2 How will the plants that grow from this plant's fertilized seeds compare to the plants grown from its daughter tubers? A They will look the same because the plants grown from seeds are genetically identical to one another but not to the mother plant. B They will differ because only the plants grown from seeds will be genetically identical to the mother plant. C They will look the same because the plants grown from tubers and the plants grown from seeds will both be genetically identical to the mother plant. They will differ because only the plants grown from tubers will be genetically identical to the mother plant 1:53 PM
Answer:
I dont have an answer but what is the actual answer
Explanation:Confused (NO ANSWER)
They will look the same because the plants grown from seeds are genetically identical to one another but not to the mother plant. So, the correct option is (A).
What is Fertilization in plants?Fertilization is defined as the process of sexual reproduction, which occurs after pollination and germination which can be defined as the fusion of male gametes called pollen with female gametes called as ovum to form diploid zygote. It is a physio-chemical process that occurs after pollination of the carpel.
Steps of Fertilization occur in Plants
1. Pollination
2. Germination
3. Fertilization
Fertilization occurs through the pollen tube opening into the ovule through the micropyle and bursting into the embryo sac where the male nucleus fuses with an egg nucleus inside the ovule to form a diploid zygote, which then swells and develops into a fruit. These plants are similar in appearance when grown from seed but with the tuber method they will appear identical but not with the mother.
Thus, they will look the same because the plants grown from seeds are genetically identical to one another but not to the mother plant. So, the correct option is (A).
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Which of the following factors would NOT cause a population decline?
a. disease
b. natural disasters
c. competition
d. predation
e. peace
Answer:
peace
Explanation:
All the other options are bad. Peace would bring unity.
Natural Disasters-can infect waters,kill peoplw,etc.
Competition-people killing each other or animals to gain something over their opponent
Diseases-kills people,brings anxiousness
Predation-Kills animals. No animals,bad environment
Answer:
peace is the factor that will not cause that
Please help me I don't understand
Answer:
D
Explanation:
All of the other options go against actual facts and the laws of biology