Describe how the action potential is regenerated by local ion flux

1 answer:

6 0

Action potential is a mechanism of transfer of ions across the plasma membrane down their elctrochemical gradient. Action potential is regenerated by the influx of ions such as sodium in case of voltage gated sodium channels. The voltage gated channels can be either open or closed depending on the action potential. Depolarization of membrane leads to the opening of these channels that allow the sodium ions to enter the cell down their electrochemical gradient. The threshold of action potential is reached when the entry of sodium ions out reach the exit of potassium ions from the cell. This leads to the generation of action potential.

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the two sources of information used to direct the expression of genes durning various stages of development are

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The two sources of information used to direct the expression of genes during various stages of development are Transcription and Translation.

<h3><u>Explanation:</u></h3>

Both of them combined is called gene expression.Transcription is the process of sharing information stored in a DNA to RNA. The process of translation is carried out in cytoplasm. Here, the mRNA, in which stands for messenger, send messages to a more complex and specialized molecule called the ribosome. The sequence present on the mRNA base is read by the ribosome.

Transcription takes place in nucleus and translation takes place in Cytoplasam. The products of transcription are mRNA, tRNA, rRNA. The products of translation are Proteins.

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What type of cells, sex cells or somatic cells ,are produced by this process

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Answer:

Human sex cells are produced by a two-part cell division process called meiosis.

Explanation:

Through a sequence of steps, the replicated genetic material in a parent cell is distributed among four daughter cells. Meiosis produces gametes with one-half the number of chromosomes as the parent cell

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Which is a true statement of crossing-over?

inna [77]

Answer: The DNA of the diploid cell is copied

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Which is an example of active transport?

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Active transport is a type of transport that requires energy to move substances across a membrane. It occurs against a concentration gradient.

The use of energy to move waste materials out of a cell is an EXAMPLE of transport active.

Active transport occurs against a concentration gradient, whereas passive transport (i.e., diffusion) occurs in favor of a concentration gradient.

Active transport can be mediated by membrane proteins that move substances from an area of high concentration to an area of low concentration.

This movement (active transport ) usually requires the energy provided by the hydrolysis of ATP.

Water molecules move across cellular membranes through membrane protein channels called aquaporins that act in favor of a concentration gradient (passive transport).

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