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3 years ago

One-way synaptic transmission occurs because ________.

Biology

1 answer:

Olegator [25]3 years ago

4 0

Answer:

Receptors for neurotransmitters are mostly found on the postsynaptic membrane

Explanation:

One-way synaptic transmission is usually a chemical synapsis, where an electrical impulse is transmitted along the neuron's axon until it reaches the axon terminals, then a depolarization of the presynaptic membrane occurs, leading to the liberation of neurotransmitter molecules from the synaptic vesicles (located in the presynaptic membrane) into the synaptic cleft. Then the neurotransmitter molecules are captured by specific receptors found in the membrane of the postsynaptic neuron, what then leads to a hyperpolarization of the membrane followed by the generation of the postsynaptic potential.

This process can only occur in one direction because the synaptic vesicles are only found in the axon terminals, while the neurotransmitters receptors are only found on dendrites.

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1. A mutant form of LDH in which Arg109 is replaced with Gln shows only 5% of the pyruvate binding and 0.07% of the activity of

Alex787 [66]

Answer:

It is a replacement that has an important effect on protein function because Arg and Gln are residues with different chemical properties.

Explanation:

In this case, Arginine (Arg) is a basic and positively charged residue, while Glutamine (Gln) is an uncharged (neutral) amino acid. Non-conservative substitutions like that are generally expected to have deleterious effects and they are generally removed by natural selection. Moreover, Arg is also a target for phosphorylation, which is the most important posttranslational modification. Phosphorylation is known to be capable of causing the activation of different proteins, especially kinases, and, therefore, the mutation at Arg109 might also inactivate the active site of this protein.

4 0

3 years ago

I need help on this question

OleMash [197]

Answer:

S is rotting, on the other hand Q is fine.

Explanation:

S is not watered, and will rot soon, and Q is watered, so the behavior will be different.

8 0

3 years ago

within a forest ecosystem, there is a large amount of diversity among members of a warbler species. of the following stages of m

anzhelika [568]

Crossing over occurs between homologous chromosomes, and is closely involved in genetic variation. The stage that most contributes to diversity is stage C, where you can see chromosomes after crossing-over.

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There are different mechanisms involved in producing genetic variation among descendants. These are,

Crossing-over between homologous chromosomes (prophase 1),

Random lining of homologous chromosomes (metaphase 1),

Random fertilization

The Crossing-over events occur between two homologous chromosomes in the equatorial plane and make the daughter cells genetically different from the original one.

The Chiasma is the position where two homologous chromatids interchange genetic information, giving a place for new genetic material or information to be provided to descendants.

After crossing over, homologous chromosomes get separated again.

In the attached imaged there are four different stages of meiosis.

Stage C is the one that contributes the most to diversity.

We can see that crossing over has already occurred between homologous chromosomes, and they have already interchanged segments.

In the image you will see the difference between chromosomes that has gone through the crossing over mechanism, and chromosomes that has not. The difference in color represents segments interchange and variation.

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You can learn more about crossing over at

brainly.com/question/12911831?referrer=searchResults

brainly.com/question/394891?referrer=searchResults

6 0

2 years ago

The process by which our sensory systems convert stimulus energies into neural messages is called

lesantik [10]

Answer:

transduction

Explanation:

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3 years ago

Explain the process of translocation in stems.

GrogVix [38]

Answer:

Translocation is the movement of materials in plants from the leaves to other parts of the plant. Nutrients, mainly sugars, are created in the leaves during photosynthesis. These are then transported throughout the plant through phloem, which are a long series of connected cells.

Explanation:

8 0

3 years ago