Question

Which are examples of active transport across the cell membrane? a. osmosis and diffusion b. diffusion and facilitated diffusion c. osmosis and chemiosmosis d. endocytosis and exocytosis

Answer 1

Answer:

d. endocytosis and exocytosis

Explanation:

These processes bring specific items in/out of the cell through active transport since the particles being brought in are generally large. Water for example, a much smaller particle, would use passive transport through the process of osmosis. Hope this helps!

Answer 2

Endocytosis and exocytosis are examples of active transport across the cell membrane.

Active transport is the movement of substances in and out of the cell through the membrane using energy and occurs against a concentration gradient.

• Endocytosis is called the process by which cells incorporate into them molecules, large or small, that cannot pass through the cell membrane.

An example is the endocytosis of the complex that is formed between receptor proteins of polypeptide or protein hormones at the level of the plasma membrane.

• Exocytosis is the process by which different types of molecules contained in a cytoplasmic vesicle of a cell are secreted outwards.

Insulin secretion is done in small pinocytosic vesicles that have insulin in colloidal dispersion, this secretion is in favor of a gradient, since insulin is more concentrated within the cell than in the extracellular space.

Therefore, we can conclude that endocytosis and exocytosis are examples of active transport across the cell membrane.

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