Question

Which cellular structure makes it possible for a cell to differ structurally and biochemically from its surroundings? select one:

a. nucleolus

b. nucleus

c. plasma membrane

d. cell wall

e. endoplasmic reticulum?

Answer 1

Answer: The correct answer is - c. plasma membrane.

Plasma membrane( also called Cell membrane, made up of bilayer of phospholipids) is a membrane surrounding the cytoplasm of all cells and separates the internal environment of cell from its exterior environment.

It is a semipermeable membrane, which means that it allows the entry and exit of only specific molecules ( such as small uncharged molecules, small polar molecules like Oxygen and Carbon-dioxide, small uncharged polar molecules like water).

Also, it does not allow the toxic substances to enter the cell and at the same time the useful substances to leave the cell.

By doing this, it keeps the cell interior structurally and biochemically different from its surroundings.

Answer 2

Correct answer: C). Plasma Membrane

The plasma membrane is a network of proteins and lipids that are known to form the boundary between the cell contents and the outside environment. The cell membrane is made up of a phospholipid bilayer.

It is a selectively permeable membrane that is known to regulate the movement of the substances inside and outside of the cell. Its main function is to protect the cell from the surrounding environment.

Hence, the correct answer would be option C.