Which of the following best characterizes depolarization?
A. small consecutive steps of Na+ exit from cytoplasm into extracellular fluid
B. mass movement of Na+ into the axon cytoplasm from the cell body to the terminal
C. small consecutive steps of Na+ penetration into the axon along its length
D. small consecutive steps of K+ entering the cytoplasm
Answers
The best that characterizes depolarization is small consecutive steps of Na+ penetration into the axon along its length.(C).
Depolarization refers to a change in the electrical potential across the cell membrane of a neuron or other excitable cell. It occurs when positively charged ions, such as sodium (Na+) or calcium (Ca2+), flow into the cell, which makes the inside of the cell more positively charged relative to the outside. This change in electrical potential can trigger the neuron to fire an action potential, which is the electrical signal that travels down the axon of the neuron. It travels down the axon in a series of rapid depolarization and repolarization events, which propagate the electrical signal to the next neuron or target tissue. Hence The best that characterizes depolarization is small consecutive steps of Na+ penetration into the axon along its length. (C).
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Related Questions
cytotoxic t cell activation by cell-mediated immunity results in the ______ and apoptosis of infected cells.
Answers
The cytotoxic T cell activation by cell-mediated immunity results in the lysis and apoptosis of infected cells. The mechanism of cell-mediated immunity is crucial in the defense against intracellular organisms like viruses and bacteria that infect cells.
The immune response begins when an antigen-presenting cell, or APC, presents an antigen to a T helper cell. T helper cells help activate cytotoxic T cells and other immune cells. Once cytotoxic T cells recognize the antigens presented by APC, they release proteins called perforins and proteases.
Perforins make holes in the cell membrane of infected cells. Proteases enter through the holes and break down proteins inside the cell. In the end, the infected cell undergoes lysis and apoptosis. This mechanism is crucial in the defense against intracellular pathogens such as viruses, as it destroys the infected cells, preventing the spread of the infection.
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The lytic cycle is one reproductive cycle that viruses can enter.
What is the name of the other virus life cycle?
A. Lytogenic
B. Lysogenic
C. Lysic
D.Lysosome
Answers
Answer: B. Lysogenic Cycle
Explanation:
HELPPPPPP MEEEEEEEEE PLZZZZZZZZZZ
Answers
Answer:
01). cells
02).seeing inside the cells
03).Robert hook
During protein formation, if an essential amino acid is missing, what can happen to the remaining amino acids?
Answers
Answer: If an essential amino acid is not available in the required quantities, protein synthesis will not occur, even if other amino acids are available in the required quantities.
Explanation: During protein synthesis, if one or more amino acids are missing or not present in the required proportions, then the body can't initialize the process of protein production. The remaining amino acids left unsynthesized are degraded, either excreted through urea or converted into fat or carbohydrate.
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a genetic screen for eye color mutants resulted in five fly strains with independent mutations: three with white eyes and two with orange eyes. the genomic locations of each of the five mutations has been identified. what results are possible? check all that apply.
Answers
The possible results from the genetic screen for eye color mutants are that all five mutations are located on different chromosomes, or that two of the mutations are on the same chromosome and the other three are on different chromosomes.
The eye color mutations in the five fly strains may be located on different chromosomes or on the same chromosome. If all five mutations are located on different chromosomes, they will independently assort during meiosis and produce offspring with all possible combinations of eye colors.
If two of the mutations are located on the same chromosome and the other three mutations are on different chromosomes, then the mutations on the same chromosome will tend to be inherited together and produce offspring with two of the five possible eye colors.
Therefore, the correct answer is that all five mutations are located on different chromosomes, or that two of the mutations are on the same chromosome and the other three are on different chromosomes.
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Does anyone know the answer for 1?
Answers
Provide your thoughts (explain in 3-paragraph detail) on (i) drinking/potable water processing techniques, (ii) efficient, public water supply, and (iii) (continuously) gaining the public confidence on tap water, across the US/World:
Hint: You may base your answer with respect to drinking water treatment and the SDWA (if you prefer, but not required), and/or any other/your field-observed experience.
Answers
Water is an important resource, all the three concepts deal with providing safe water to people.
The three concepts can be described as -
Drinking/potable water processing techniques: Multiple processes are taken during drinking water processing techniques to ensure that contaminants are eliminated and that the water is safe to drink. Depending on particular water supply and quality, common treatments include filtration, disinfection, and occasionally more sophisticated ones like activated carbon adsorption or reverse osmosis.
Efficient, public water supply: Effective public water supply systems are essential for giving communities access to dependable and clean drinking water. To guarantee enough access to clean water for all populations, this calls for distribution networks, well-maintained infrastructure, and efficient water treatment procedures.
Public Confidence in tap water: Gaining the public's trust in tap water requires open communication about its quality, thorough testing, and adherence to legal requirements. Campaigns to educate the public on the advantages and safety of tap water, together with proactive steps to resolve concerns, can help foster trust and persuade people to select tap water over bottled alternatives, reducing plastic waste and fostering sustainable water practises.
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In which organelle is ATP produced in the cell?
Answers
Answer: Mitochondrion
Explanation:Mitochondria are membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions. Chemical energy produced by the mitochondria is stored in a small molecule called adenosine triphosphate (ATP).
Answer:
Mitochondrion is the answer to this question
how does the extinction of species affect humans
Answers
Answer:
it decreases water and air quality
Explanation:
inflammatory mediators such as bradykinin and histamine cause blood vessels to _____.
Answers
Inflammatory mediators such as bradykinin and histamine cause blood vessels to dilate. When these mediators are released during an inflammatory response, they cause the blood vessels in the affected area to widen, allowing more blood flow to the site.
This increase in blood flow helps to bring immune cells and nutrients to the area to fight off infection or promote healing.
Bradykinin is a peptide that is involved in the regulation of blood pressure and inflammation. It is produced in response to tissue injury or infection and causes blood vessels to dilate and become more permeable. This allows immune cells and antibodies to enter the site of injury or infection and helps to promote healing.
Histamine is a chemical that is released by immune cells in response to injury or infection. It causes blood vessels to dilate and become more permeable, which allows immune cells and antibodies to enter the affected area and fight off infection. Histamine is also responsible for the symptoms of allergies, such as itching, swelling, and redness, which occur when histamine is released in response to an allergen.
In summary, inflammatory mediators such as bradykinin and histamine cause blood vessels to dilate, which helps to bring immune cells and nutrients to the site of injury or infection and promote healing.
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Which of the following is not a truly inherited characteristic?
A. Natural eye color
B. Blood type
C. Skin color.
D. Natural hair color.
Answers
Answer:
B. Blood type
Explanation:
i think
what happens to the signal sequence in the er membrane
Answers
Answer:
The signal sequence is cleaved(divided) as the polypeptide chain crosses the membrane hence the amino terminus of the polypeptide chain is exposed in the ER lumen.
Explanation:
large air tubes leading from the trachea to the lungs which convey air to and from the lungs; consist of primary, secondary or tertiary and right and left bronchioles
Answers
Answer:
Explanation:
Further down, the trachea divides into two tubes (left and right) called bronchi (BRAHN-kye). The bronchi connect the trachea to the lungs.
what would the correct definitions be
Answers
Answer:
What the genetic makeup actually looks like: genotype
Trait thats hidden: recessive trait
overpowering trait: dominant trait
Actual genetic makeup: phenotype
1st and 4th may be mixed up.
Which of these would form first during the development od a complex multicellular organism, such as an animal?
A) cell
B) organ
C) tissue
D) organ system
Answers
Answer:
Cell
Explanation:
Cells are the fundamental blocks and will certainly form first before anything other develops
Answer:
A
Explanation:
Cells are the building blocks of life and there for the first to develop
1. Look at the graph provided. Portions A, B,
and C are all associated with which phase of
the cell cycle?
2. This graph shows the cell division of one cell.
Which of the following cells is represented in
the graph?
a. A skin cell
b. A cancerous cell
C. A sperm cell
d. A stomach cell
3. Explain why you chose your answer to the
previous question.
Answers
1) The interphase. 2) A sperm cell (Option C). 3) This is a meiotic division that involves two interphases and two cell divisions, resulting in cells with half the DNA mass of the parental cell.
What is the interphase?
The interphase is the series of events that preceeds cell division. It is composed of the G1, S, and G2 stages.
During the G1 stage, the cell duplicates in size. The organelles and other cytoplasmatic structures duplicate. The highly intense biochemical activity is characteristic of this stage.During the S stage occurs the DNI replication process. At this point, also happens the synthesis of histones and other associated proteins. This is the only stage where the DNI molecule is replicated. The G2 stage is the final one before the cellular division. Here begins the slow process of DNI condensation. Duplication of centrioles completes. Structures such as spindle fibers are assembled.Interphase is the longest stage during the whole cell cycle. It takes much longer to complete the interphase that cell division.
Mitosis
The mitotic division involves the interphase followed by cell division, which results in two diploid cells.
Meiosis
Meiosis is divided into two phases: the reductive and the nonreductive phases.
First occurs the interphase followed by the cell division, which results in two haploid cells. Then, each of these haploid cells goes through the interphase again and another cell division, resulting in a total of four haploid cells.Now let us analyze the graph,
The graph represents the relationship between time and mass of DNA per cell. So, the mass of DNA changes as time runs. The curve shows two picks in which DNA mass reaches a maximum point.Portions A, B, and C represent the interphase, probably the G1, S, and G2 phases.
During the B portion, DNA is duplicating, meaning that the cell is going through the S phase.
At the C portion, DNA has already been replicated, probably in the G2 phase.
Portions A, B, and C are all associated with THE INTERPHASE.
Following this assumption, if A, B, and C represent the interphase, then A, E, and F also represent the interphase.
This suggests there are two interphases in this cell cycle, each of them followed by a cell division.
During each cell division (D, G, and H) there is a reduction in the amount of DNA per cell.
Besides, at the end of the cycle, each cell ends with half the DNA mass of the parental cell, suggesting these daughter cells are haploid gametes.
If this is the case, then we are talking about a meiotic division.
The cell represented in the graph is A sperm cell (Option C).
This is a meiotic division that involves two interphases and two cell divisions, resulting in cells with half the DNA mass of the parental cell.
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When does heat produce a chemical change?
Answers
Answer:
Heat produces a chemical change when energy is released in the form of light
Explanation:
Describe how your body prevents pathogens from entering and how would your body fight off the pathogens.
Answers
The body has evolved defences that act to prevent pathogens entering it. If a pathogen does enter the body then the immune system helps to fight it off. If pathogens manage to pass the non-specific first line of defence then they will cause an infection. However, the body has a second line of defence to stop or minimise this infection.
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A science class tested ways to clean water after an oil spill. Each group of students was given 100 mL of vegetable oil, 100 mL of engine oil, and 800 mL of water in a rectangular plastic container. Each container also held five floating wooden cubes (5 cubic centimeters each) representing animals in the water. Each group was tasked with removing as much oil as possible in a 20 minute period, leaving “clean water” in the container, using whatever tools they brought to class. The results of the “clean-up” are presented in the table below.
Group
Vegetable oil removed (mL)
Engine oil removed (mL)
1
10
20
2
110
130
3
60
40
4
80
70
Based on the results above, which group’s data are obviously unreliable?
group 1
group 2
group 3
group 4
Answers
Answer:
Group 2
Explanation:
I did this 1 year ago hope this helps :)
what best defines a diploid cell during meiosis
Answers
Answer:
a cell that has half the number of chromosomes as the parent cell
Summarize in 2-3 sentences, how an RNA vaccine works to help protect you against
viruses?
I
Answers
Answer:
boost your immune system
Explanation:
Answer:
Vaccination is the process in which substances called antigens are introduced artificially into the body to stimulate the immune system, the set of cells that protects the body against infections .
What is the most inclusive level of the hierarchical classification scheme?a) domainb) phlyumc) kingdomd) genuse) species
Answers
The most inclusive level of hierarchical classification is Domain, since in that group, there are found multiple Phylum, Kingdom, Genus, and Species.
This system of classification is what we know as taxonomy, what is a tool scientists use to organize more similar species together. We can see that the main groups of the classification are the ones listed below:
Domain
Phylum
Kingdom
Class
Order
Family
Genus
Species
And we, as human beings, but also as Homo sapiens classifies us in the Eukarya domain, in the Chordata phylum, in the Animalia kingdom, in the Mammalia class, in the Primates order, in the Homindae family, in the Homo genus, and in the sapiens species.
A crocodile-like morphology evolved independently in a group of Triassic reptiles called phytosaurs, and later, after phytosaurs were extinct, in true crocodiles. This is an example of: Sympatric speciation. Iterative evolution Evolutionary drift Genetic drift Lamarckian evolution
Answers
The correct answer is iterative evolution. A crocodile-like morphology evolved independently in a group of Triassic reptiles called phytosaurs, and later, after phytosaurs were extinct, in true crocodiles. This is an example of iterative evolution.
Iterative evolution is the development of similar structures or forms independently over time in separate lineages. This is frequently seen in unrelated lineages of organisms that evolve similar features through convergent evolution. The crocodile-like morphology that evolved independently in Triassic reptiles called phytosaurs and later in true crocodiles is an example of iterative evolution as they evolved independently in separate lineages. The ability of the phytosaurs to thrive in an aquatic environment likely contributed to the development of this morphology, which later allowed true crocodiles to similarly thrive.
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Plssss help meee I need to be done by 9pm
Answers
We may use a Punnett square to demonstrate why two people with type A blood (IAIA) cannot have a kid with type O blood (ii).
What are the two ways you may let students see the results of your Nearpod lesson assessment?You may easily start a class in student-paced mode and then provide the code to your students through email or your learning management system (LMS).
Can two persons collaborate on a single Nearpod?It's simple to share your favourite Nearpod material with a coworker. Through a series of easy steps, teachers can share lessons they've downloaded or prepared with another teacher. Teachers can improve collaboration and instructional consistency across grade levels, subjects, or smaller groups by using shared Nearpods.
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what relatively recent fossil discovery has helped us understand the transition between the lobe-finned fishes and the tetrapods?
Answers
Tiktaalik's recent fossil discovery has helped us understand the transition between the lobe-finned fishes and the tetrapods.
Early lobe-finned fishes are hard fish with plump, lobed, matched blades, which are joined to the body by a solitary bone.
The discovery of well-preserved pelves and a portion of the pelvic fin from Tiktaalik roseae, a 375 million-year-old transitional species between fish and the first animals with legs, indicates that improved hind fins were the actual starting point for the evolution of hind legs.
The non-tetrapod Osteichthyes (bony fish) Tiktaalik was discovered in the Arctic of Canada. It has scales and gills, but it has a triangular, flattened head and unusual, cleaver-shaped fins.
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If the mass the rock is 50 grams , what is the density of the rock
Answers
Answer:density
=
2.9
g/cm
3
Explanation:
We're asked to find the density of the rock, given some mass and volume information.
We're given that the mass of the system before the rock was added was
120
g
. The mass after the rock was added was
250
g
, so the rock's mass is
m
rock
=
m
final
−
m
initial
=
250
l
g
−
120
l
g
=
130
l
g
−−−−−
The initial volume of water in the graduated cylinder was
30
mL
, and the volume after the rock was added read
75
mL
, so the rock's volume is
V
rock
=
V
final
−
V
initial
=
75
l
mL
−
30
l
mL
=
45
l
mL
−−−−−−
The equation for the density of the rock is
density
=
mass
volume
And so we have
density
=
130
l
g
45
l
mL
=
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
∣
∣
∣
2.9
l
g/mL
=
2.9
l
g/cm
3
∣
∣
∣
−−−−−−−−−−−−−−−−−−−−−−−−−
Explanation:
Two pea plants produce round seeds. Which of the following should you conclude about the genetic material in these two plants? *
They have identical DNA
They have the same parents
They grew from a single seed
They share a common gene
Answers
Answer:
Common Gene, as the other answers are unlikely
Mistletoe contains root-like structures that penetrate the branches of oak trees, where they absorb water and minerals from the oak tree. This is an example of --
A- predation
B- competition
C- parasitism
D- commensalism
Answers
the prominent pad of muscles at the base of the thumb is called the:
Answers
The prominent pad of muscles at the base of the thumb is called the thenar eminence. It is responsible for controlling fine movements of the thumb and is important for gripping and grasping objects.
The thenar eminence is a group of muscles located on the palm side of the hand, specifically at the base of the thumb. It is named after the Greek word "thenar," meaning palm of the hand. The thenar eminence is made up of four muscles: abductor pollicis brevis, flexor pollicis brevis, opponens pollicis, and adductor pollicis. These muscles are responsible for controlling the movements of the thumb and allow for precision grip and manipulation of objects. The thenar eminence can be important for activities such as writing, typing, and holding tools.
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Genes are sections of DNA that code for a particular trait. Genes are:
A. Carbohydrates
B. Lipids
C. Proteins
D. Nucleic Acids
Answers
Answer:
Genes are sections of DNA that code for a particular trait. Genes are nucleic acids.
Explanation: