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djverab [1.8K]
3 years ago
13

When a cell is in equilibrium with its environment, which of the following processes occurs for substances that can diffuse thro

ugh the plasma membrane?
A) There is random movement of substances into and out of the cell.
B) All movement of molecules across the plasma membrane occurs by active transport.
C) There is directed movement of substances into and out of the cell.
D) There is no movement of substances into or out of the cell.
Biology
2 answers:
Ronch [10]3 years ago
5 0

Answer:

The correct answer is A.

Explanation:

Diffusion is the net movement of a substance from a region of higher concentration to a region of lower concentration. The difference in concentration between two environments creates a concentration gradient which is what drives diffusion. Therefore, this movement does not require aid such as extra energy molecules for active transport or integral membrane proteins for directed movement, hence the answer is not B nor C. If the cell is in equilibrium with its environment, it means that the concentration of substances inside the cell is equal to the concentration outside the cell, and any movement that takes place will be random movement of substances across the plasma memberane. Movement in the cell will not cease as the cell is still active. Therefore, the answer cannot be D either.

telo118 [61]3 years ago
4 0

Answer:

The correct answer is A.

Explanation:

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If you are checking a cell for a zero value and the cell is blank, the test evaluates to true. For example, if you have the following formula in cell A1 =IF(B1=0,"zero","blank") and B1 is blank, the formula returns "zero" and not "blank" as expected.

If the range might contain a blank cell, you should use the ISBLANK function to test for a zero value, as in the following example: =IF(ISBLANK(B2),"blank",IF(B2=0,"zero","other")) Note that the above formula returns "zero" if there is a zero value in the cell, "blank" if the cell is blank, and "other" if anything else is in the cell.

You must always use the ISBLANK formula first before you test for a zero value. Otherwise you will always return a "true" for the zero value, and never get to the test for the ISBLANK formula.
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