Identify true statements about the propagation of a nerve impulse. A.An action potential is initially triggered by the opening of voltage-gated K+ channels. B.When voltage-gated potassium channels open, potassium ions move out of the cell restoring the resting membrane potential. C.Action potentials propagate more slowly in axons wrapped in myelin sheath than in unwrapped axons. D.The propagation of a nerve impulse relies on changes in membrane potential along the length of a nerve. E.The action potential triggers the opening of sodium channels further down the axon. F.The influx of sodium ions makes the membrane potential more positive. G..The action potential triggers the opening of voltage-gated potassium channels. H.The action potential can only travel in one direction along the axon.
Answers
The true statements about the propagation of a nerve impulse are:
D. The propagation of a nerve impulse relies on changes in membrane potential along the length of a nerve.
F. The influx of sodium ions makes the membrane potential more positive.
G. The action potential triggers the opening of voltage-gated potassium channels.
H. The action potential can only travel in one direction along the axon.
A. This statement is not true. An action potential is initially triggered by the opening of voltage-gated sodium channels.
B. This statement is partially true. When voltage-gated potassium channels open, potassium ions move out of the cell, which contributes to the repolarization of the membrane potential, but not necessarily to restoring the resting membrane potential.
C. This statement is not true. Action potentials propagate more rapidly in axons wrapped in myelin sheath due to saltatory conduction.
E. This statement is not true. The action potential triggers the opening of voltage-gated sodium channels further down the axon, not sodium channels in general.
Therefore, the true statements are D, F, G, and H.
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Related Questions
which population of flamingos is more dense : 15 flamingos in a 5 square meter area or 40 flamingos in a 10 square meter area
Answers
15 flamingos in a 5 square meter is only 3 flamingos per square meter. The correct answer is 40 flamingos in a 10 which is square meter is 4 flamingos per square meter.
The collective noun to describe a gathering of flamingos is flamboyance, an appropriate term for these colorfully-feathered creatures. They flock together by the thousands on salt flats, lagoons, lakes, and swamps around the world, where they can filter-feed for shrimp, algae, and insects.
Flamingos are serially monogamous. They mate for one year, get divorced, and find a new mate the next year. New mates are mutually agreed upon males and females both dance in search of a compatible partner.
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15 flamingos in a 5 square meter is only 3 flamingos per square meter. The correct answer is 40 flamingos in a 10 which is square meter is 4 flamingos per square meter.
40 Flamingos in a 10 which is square meter is 4 flamingos per square meter.
The average number of people in a population per unit of area or volume is known as population density. An area of 100 square metres with a population of 100 insects has a density of 1 bug per square metre.
The amount of people in a place is gauged by its population density. It is a typical value. By dividing the total population by the available space, population density is determined. The number of persons per square kilometre is the most used measure of population density.
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explain how a message is passed WITHIN a neuron
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The transfer of information from neuron to neuron takes place through the release of chemical substances into the space between the axon and the dendrites. These chemicals are called neurotransmitters, and the process is called neurotransmission.
Select the code that a program would follow to draw a rectangle after the pen down command. O Move 100 steps, turn right 90 degrees, move 50 steps, turn right 90 degrees with four iterations O Move 100 steps, turn right 90 degrees, move 50 steps, turn right 90 degrees with two iterations O Move 100 steps, turn right 90 degrees with four iterations O Move 100 steps, turn right 90 degrees with two iterations
Answers
The code that a program would follow to draw a rectangle after the pen down command is: "Move 100 steps, turn right 90 degrees, move 50 steps, turn right 90 degrees with two iterations."
In order to draw a rectangle, we need to move the pen in a specific pattern. The code provided instructs the program to first move 100 steps forward, then turn right 90 degrees. After that, it moves 50 steps forward and again turns right 90 degrees. This set of instructions is repeated two times, resulting in a total of four sides being drawn. By following this code, the program will successfully draw a rectangle shape.
It is important to note that the code with four iterations would result in a rectangle with longer sides, as it would repeat the set of instructions four times. However, the given question specifically asks for the code with two iterations, which would create a rectangle with shorter sides. Therefore, the correct code to draw a rectangle after the pen down command is "Move 100 steps, turn right 90 degrees, move 50 steps, turn right 90 degrees with two iterations."
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A person can have hundreds of different type of cells because:different cells result from genetic variation in meiosis.different cell types have different genes.different cell types all have the same genes but have different genes active.None of these choices is correct.
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Humans have specialized cells in the body. Each cell type performs a unique function. Humans have different type of cells with different structures and functions.
All the cells in a human's body contain the same DNA. However, the human body is composed of many different types of cells. Because of gene regulation, each cell type possess a different set of active genes although all the cells of the body contain the same DNA.
Answer - different cell types all have the same genes but have different genes active.
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What is the largest order in the Phylum Aves?
Answers
Answer:
Passeriformes - Perching Birds 3
Explanation:
3. Where do you place the manupulated variable on a line graph?
Answers
Answer:
On the x-axis
Explanation:
Answer: you place it on the x-axis
Explanation:
A hypothesis is not stated, but what do you think was Dr. Rains’ hypothesis about what would happen in the experiment?
Answers
Based on the fact that a hypothesis is not stated and Dr. Rains makes a hypothesis about what would happen during an experiment, it is clear that he is making an educated guess.
This is purely conjectured as it has to do with little or no evidence about a thing and is not considered a fact until proven otherwise.
What is a Hypothesis?This refers to the educated guess that is used during reasonable thinking, in order to find the answer to a scientific question.
Based on the fact that a hypothesis is not stated and Dr. Rains makes a hypothesis about what would happen during an experiment, it is clear that he is making an educated guess.
This is purely conjectured as it has to do with little or no evidence about a thing and is not considered a fact until proven otherwise.
Hence, we can see that your question is incomplete, so I gave you a general overview to help you get a better understanding of the concept.
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why do scientist use physical model of a plant cell instead of studying a cell directly
Answers
Explanation:
the purpose of scientific modeling varies.for example three dimensional helix model of DNA are used to visualize a object or system often being created from experimental data.Other models are intended to describe an abstract or hypothetical behaviour or phenomenon
The genetic diversity is the same as species diversity.
Answers
This was written as a statement, but I'll answer it as if it were a true or false question.
Answer:
False
Explanation:
Genetic diversity is the range of different traits within a species. Species diversity is the number of different species present in a place and the amount of each of those species. The difference is that genetic diversity refers to something within one species whereas species diversity refers to multiple species within a common location, or community.
If humans are adding more carbor to the atmosphere than ever before, changing our climate whar can humans do to resolve this issue?
Answers
where in how are chromosome format sig8
Answers
The chromosome format sig8 refers to a representation of genetic information using a binary encoding scheme known as Sigma-8. It is commonly used in computational biology and genetics to represent and manipulate genetic sequences. The Sigma-8 encoding scheme assigns 8 bits to each nucleotide base (A, T, G, or C) in a chromosome.
1. Chromosome Format: Chromosomes are structures found in the nucleus of cells that contain genetic information. They consist of DNA molecules tightly coiled around proteins. The format of a chromosome refers to the representation of its genetic sequence.
2. Sigma-8 Encoding: Sigma-8 is a binary encoding scheme used to represent genetic sequences. In this scheme, each nucleotide base (A, T, G, or C) is assigned a unique 8-bit binary code.
3. Binary Representation: In the Sigma-8 encoding, each nucleotide base is represented by a sequence of 8 binary digits (bits). For example, A might be represented as 00000001, T as 00000010, G as 00000011, and C as 00000100.
4. Chromosome Encoding: To represent a chromosome using the Sigma-8 format, the genetic sequence is divided into individual nucleotides, and each nucleotide is encoded using its corresponding 8-bit binary representation.
5. Manipulating Genetic Information: Once a chromosome is encoded in the Sigma-8 format, it can be manipulated using various computational techniques. This encoding allows researchers to perform operations such as mutation, recombination, and selection on the genetic sequences.
In summary, the chromosome format sig8 refers to the use of the Sigma-8 encoding scheme to represent genetic information. This binary encoding assigns 8 bits to each nucleotide base, allowing for efficient manipulation and analysis of genetic sequences in computational biology and genetics.
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Bloodtype phenotype Genotype
A+
B+
A-
B-
AB+
O+
O-
Answers
Answer:
The genotype must be AB. Someone with blood type O has neither the A nor the B allele.
Explanation:
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What is the source of carbon for terrestrial plants? terrestrial plants acquire carbon from the .
Answers
During this process, plants cleave the carbon from the two oxygen molecules and terminate the oxygen back into the surrounding circumstances.
What is terrestrial plants?In terrestrial communities, plants transform atmospheric carbon dioxide into carbon-based combinations through photosynthesis (see above The photosynthetic operation). During this process, plants cleave the carbon from the two oxygen molecules and terminate the oxygen back into the surrounding circumstances.Many terrestrial manufacturers are not even helophytes but rainforest species that tolerate occasional inundation. Examples of these types of plants contain Syngonium, Philodendron, Adiantum, Aglaodorum, Aglaonema, Cordyline, Ophiopogon, and Physostegia.Terrestrial manufacturers are defined as any manufacturer that grows on, in, or from the land. By contrast, aquatic plants are manufacturers that thrive when their roots are submerged in moisture.To learn more about terrestrial plants, refer to:
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What natural phenomenon is enhanced by the surplus carbon in the atmosphere?
Answers
Explanation:
surplus carbon in atmosphere...phenomenon, . makes the Earth very warm. helps plants on land...
By the addition of more surplus carbon to the atmosphere, the natural greenhouse effect gets changed which causes global temperature to rise and hence global warming.
What is Greenhouse effect?The greenhouse effect is heat which is trapped close to Earth's surface by the presence of greenhouse gases. These heat-trapping gases can be considered as a blanket wrapped around the Earth that keeps the planet warmer than it would be without them.
The increases in carbon dioxide are caused primarily by the human activities as carbon is produced by burning fossil fuels, pollution, etc. The disruption to Earth's climate equilibrium is caused by the increased concentrations of greenhouse gases which lead to an increase in the global surface temperature of the planet.
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What is a chromosome
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Answer:
In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
Chromosomes are not visible in the cell’s nucleus—not even under a microscope—when the cell is not dividing. However, the DNA that makes up chromosomes becomes more tightly packed during cell division and is then visible under a microscope. Most of what researchers know about chromosomes was learned by observing chromosomes during cell division.
Each chromosome has a constriction point called the centromere, which divides the chromosome into two sections, or “arms.” The short arm of the chromosome is labeled the “p arm.” The long arm of the chromosome is labeled the “q arm.” The location of the centromere on each chromosome gives the chromosome its characteristic shape, and can be used to help describe the location of specific genes.
Which of the following statements is true?
Flowering plants reproduce using spores.
Some plants cannot reproduce.
Mitosis results in two non-identical cells.
Pollen contains male sperm cells.
Answers
what takes place during the acquisition step in the crispr/cas defense against viral infection in bacteria?
Answers
During the acquisition step in the CRISPR/Cas defense against viral infection in bacteria, the bacteria incorporate fragments of viral DNA or RNA into their own genome. This process allows the bacteria to "remember" the viral genetic material and mount a specific defense against future infections by the same or closely related viruses.
1. Viral Infection: Bacteria get infected by a specific virus (also known as a bacteriophage) that carries its genetic material in the form of DNA or RNA.
2. Recognition: The CRISPR/Cas system in the bacteria recognizes the invading viral DNA or RNA as foreign.
3. DNA Fragmentation: The bacterial CRISPR-associated (Cas) proteins cleave the viral DNA or RNA into smaller fragments.
4. Spacer Acquisition: The bacteria select a small fragment of the viral genetic material and incorporate it into their own genome. This small fragment is known as a spacer.
5. Integration: The spacer is integrated into a specific region of the bacterial genome known as the CRISPR array. The CRISPR array consists of multiple spacers separated by repetitive DNA sequences.
6. Memory: The CRISPR array with the newly acquired spacer becomes a heritable memory of the viral infection, allowing the bacteria to recognize and respond to the same or similar viruses in the future.
7. Adaptation: The CRISPR/Cas system, with the help of other proteins, ensures the accurate insertion of the spacer into the CRISPR array and protects it from degradation.
By incorporating spacers derived from viral genetic material, bacteria can use the CRISPR/Cas system to recognize and destroy specific viral DNA or RNA sequences during subsequent infections. The acquired spacers serve as a genetic memory that allows the bacteria to mount a targeted immune response against viral invaders.
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Many human diseases are genetically transmitted. Genes occur in pairs and each member of the pair can be of type A or a. The possible pairs are AA, Aa and aa, called genotypes. (Aa and aA are equivalent.) A child inherits one gene from its father and one from its mother. Assume that the gene transmitted to a child from each parent is chosen at random and with probability 0.5. In the example below, the father has the genotype Aa, and transmits A to the child. The mother has genotype aa and transmits a to the child. The child resulting genotype is Aa.
Father Mother
AA aa
child
Aa
a) Suppose the parents have genotypes Aa and aa as above. Explain why their offspring genotypes has the following distribution.
genotype probability
Aa 0.5
aa 0.5
b) The genetic disease is transmitted according to the autosomal recessive pattern: • The genotype aa is diseased and the child will die before it reproduces. • The genotype Aa is a carrier but is not diseased. • The genotype AA is not a carrier and is not diseased. i) [3 marks] If two carriers have a child, explain why their offspring genotypes has the following distribution.
genotype probability
AA 0.25
aa 0.25
Aa 0.5
b) ii) [3 marks] If the child of two carriers is not diseased, show that the probability that the child is a carrier is 2/3 .
Answers
By taking into account the potential gene combinations from the parents, this distribution is created. Each A and A gene has a 0.5 chance of being passed down from the father. One gene can only be passed from the mother.
The kid either inherits an A gene from the father and an a gene from the mother (resulting in the genotype Aa) or the child obtains an a gene from both parents (resulting in the genotype aa). These two possibilities are therefore equally likely.
a) Genotype Probability
Aa 0.5
aa 0.5
This is because there are two possible combinations when one gene is chosen randomly from each parent: Aa and aa. Each combination has an equal probability of 0.5.
b) 1) Genotype Probability
AA 0.25
aa 0.25
Aa 0.5
This distribution arises from the possible combinations when one gene is chosen randomly from each parent: AA, aa, and Aa. Each combination has an equal probability of 0.25.
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What adaptations do sand mason worms have to survive their environment?.
Answers
The presence of the streamlined body of the sand mason worms is what enables them survive in their environment.
What is Adaptation?This refers to changes in the characteristics of an organism that help them to survive in the changing environment.
Sand mason worms have streamlined body which enables them burrow into the soil in search of food and other activities.
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The phylogenetic classification of bacteria is based on.
Answers
Answer:
Based on the sequences of bacteria’s viral RNA, phylogeny classifications bacteria based on their distribution.
Explanation:
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Characteristic in your own words.
Answers
Answer:
a feature or quality belonging typically to a person, place, or thing and serving to identify them.
Explanation:
Which is true of cycles in an ecosystem ?
A.non living things release waste into the environment
B. Producers transfer all of the energy
C. Consumers make use only of matter
D. Matter moves in cycles and energy is transferred
Answers
Please help me anything helps.
Answers
Answer: at the center of tectonic plates hope this helpsヾ(•ω•`)o
Explanation:
Answer:
A
Explanation:
A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.
Most earthquakes occur along the edge of the oceanic and continental plates. The earth's crust (the outer layer of the planet) is made up of several pieces, called plates. The plates under the oceans are called oceanic plates and the rest are continental plates.
Which tissue makes up the husk of coconut?
Answers
Answer: Sclerenchymatous tissue makes up the husk of the coconut .
Explanation: It is one of the permanentant tissue . It is the tissue which makes the plant hard and stuff like a husk of coconut . The cells of this tissue are dead . They are long and narrow .
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Which of the following is an example of a plant virus?O BacteriophageO InfluenzaO FIVO TMV
Answers
An example of a plant virus is the Tobacco mosaic virus (TMV), which when infecting plants, cause them to have an stunted and irregular growth of their tissues, such as leaf and stems, which provokes the plant to not developing well
how does the cell membrane work
Answers
Answer:
The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.
Explanation:
having polydactyly (extra digits on hands and feet) is a dominant trait. a man has polydactyly. his wife and oldest daughter do not have polydactyly. the couple's second child has polydactyly. what is the probability that their next (third) child will have extra digits?
Answers
The probability that the next child of the couple will have extra digits is 50% or 1/2.
Probability in GeneticsPolydactyl refers to the attribute of having extra digits apart from the 5-digits that we are all used to.
The trait is considered a dominant one. This means that only one dominant allele is required for the trait to manifest itself in individuals.
Let's assume that the dominant polydactyly trait is represented by the allele A. The alternate version of the trait, not having extra digits, will be a.
The man has the trait, Thus, his genotype would be AA or Aa. If he is AA, all his children will have the trait because every one of them will inherit the A allele. But not all his children have the trait. Meaning that the man can only be heterozygous, Aa.
The woman does not have the trait. Thus, she can only be aa.
Aa x aa
Aa Aa aa aa
We already know that Aa individuals will have the polydactyl trait while aa individuals will not.
Probability of their children having polydactyl trait = 1/2 or 50%
Probability of their children not having polydactyl trait = 1/2 or 50%
Thus, at every point in time, irrespective of the number of children they have had and whether they have extra digits or not, the probability of their next child having extra digits is 50% or 1/2.
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what layer of the plant cell wall is abundant in pectins that function to hold neighboring cells together? multiple choice question. central vacuole middle lamella primary cell wall cytoplasm
Answers
The layer of the plant cell wall that is abundant in pectins that function to hold neighboring cells together is the middle lamella. Middle lamella is the correct answer.
What is the middle lamella? The middle lamella is the layer between the primary walls of adjacent plant cells. Pectins are abundant in the middle lamella, which functions to hold neighboring cells together. What is the function of pectin in plant cell walls? Pectin is a family of complicated polysaccharides that are found in cell walls. The pectin's function in the plant cell wall is to regulate cell adhesion and growth. Pectin plays a key role in cell wall structure and cellular communication, which is why it is found in the middle lamella of plant cell walls. Therefore, the middle lamella is the layer of the plant cell wall that is abundant in pectin and holds the cells together.Learn more about plant cell walls: https://brainly.com/question/16830473
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Which of the following statements correctly identifies a way in which prokaryotic cells are different from eukaryotic cells?
Answers
Answer:
Prokaryotic cell has undeveloped nucleus but eukaryotic cell has well developed nucleus.
Food moving through the G.I. tract spends the most time in which of the following organs?
Answers
Answer:
a. Large intestine
Explanation: is correct
Answer:
Large Intestine
Explanation:
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