Biology Chapter on Cell Membrane Functions

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Questions and Answers

What is the primary role of transport proteins in the plasma membrane?

To facilitate the movement of molecules across the membrane (correct)
To store energy for cellular processes
To synthesize proteins within the cell
To provide structural support to the cell

What accurately describes the difference between exocytosis and endocytosis?

Both processes require ATP and transport proteins.
Exocytosis brings substances into the cell, while endocytosis expels substances out.
Exocytosis is a form of bulk transport out of the cell, whereas endocytosis is the bulk transport into the cell. (correct)
Endocytosis occurs in response to external signals, while exocytosis is a passive process.

In the context of cellular signaling, what defines a ligand?

A signaling molecule that interacts with a receptor (correct)
A molecule that cannot cross the plasma membrane
A receptor that binds to hormones
An ion that participates in enzyme reactions

What is a key characteristic of a selectively permeable membrane?

It selectively allows certain ions and molecules to cross while blocking others. (B) Signup and view all the answers

Which of the following accurately describes a hypertonic solution in relation to a cell?

A solution with a higher concentration of solutes than the cell, leading to water leaving the cell. (B) Signup and view all the answers

What differentiates catabolic pathways from anabolic pathways in metabolism?

Catabolic pathways involve energy release through breakdown, whereas anabolic pathways involve energy use for synthesis. (D) Signup and view all the answers

Which of the following best describes the fluid mosaic model of the plasma membrane?

The membrane consists of a lipid bilayer with embedded proteins that can move laterally. (A) Signup and view all the answers

What is the significance of hydrolysis of ATP in cellular processes?

It releases energy used by the cell for various activities. (C) Signup and view all the answers