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Lady bird [3.3K]
3 years ago
10

Molecules that are not able to independently diffuse across a membrane may still move down their concentration gradient by

Biology
1 answer:
GaryK [48]3 years ago
6 0
Greater to lower concentration
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Which of the following statements about positive feedback mechanisms is not true?
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An Earth scientist is testing how various soil mixtures affect plant growth. She begins with 10 soil types. For each mixture, sh
Karolina [17]

Answer:

b

Explanation:

The correct answer would be 45.

Assuming that the 10 soils are each represented by A, B, C, D, E, F, G, H, I, J.

A can combine with 9 others as: AB AC AD AE A F AG AH AI AJ

B can combine as: BC BD BE BF BG BH BI BJ

C as: CD CE CF CG CH CI CJ

D as: DE DF DG DH DI DJ

E as: EF EG EH EI EJ

F as: FG FH FI FJ

G as: GH GI GJ

H as: HI HJ

I as: IJ

Adding all the combinations together = 45

In other words;

^{10}C_2 = \frac{10!}{(2!(10 - 2)!)} = 45

7 0
2 years ago
The change in electrical potential that occurs when an impulse passes through a nerve cell
Nadusha1986 [10]

Answer:

The answer to this definition is: ACTION POTENTIAL

Explanation:

Action potential is a phenomenon in nervous system used to describe a change in electrical current that occurs when an impulse passes through a neuron or nerve cell. Action potential is induced when sodium (Na+) ions move from the extracellular environment into the intracellular environment.

Impulse travels across the axon of a neuron and thereby causes a difference in the electric potential i.e. - mv to + mv. This process, according to this question, whereby a change in electrical potential occurs due to the passage of an impulse through a nerve cell is termed ACTION POTENTIAL.

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3 years ago
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