Question

Which of the following best describes the behavior of a gated channel?

(a) it stays open continuously when stimulated
(b) it opens more frequently in response to a given stimulus
(c) it opens more widely as the stimulus becomes stronger
(D) it remains closed if unstimulated

Answer 1

A gated channel protein is a transport protein that opens a 'gate,' allowing a molecule to pass through the membrane. The stimulus may be chemical or electrical signals, temperature, or mechanical force, depending on the type of gated channel.

Step-by-step explanation:

A gated channel protein is a transport protein that opens a "gate," allowing a molecule to pass through the membrane. Gated channels have a binding site that is specific for a given molecule or ion. A stimulus causes the "gate" to open or shut. The stimulus may be chemical or electrical signals, temperature, or mechanical force, depending on the type of gated channel. For example, the sodium gated channels of a nerve cell are stimulated by a chemical signal which causes them to open and allow sodium ions into the cell. Glucose molecules are too big to diffuse through the plasma membrane easily, so they are moved across the membrane through gated channels. In this way glucose diffuses very quickly across a cell membrane, which is important because many cells depend on glucose for energy.

Answer 2

Option B , It opens more frequently in response to a given stimulus.

Step-by-step explanation:

A gated channel is one which opens specifically to some kind of stimulus. These stimulus could be a neurotransmission, a variation or change in the pressure, voltage, lights, chemical environment or any other physical parameter.

For example

Ligand gated ion channel which have receptors forming a membrane ion channel to allow passage of specific chemicals such as Na+, K+, Ca++, or Cl− only after the activation of receptor/channel complex.

Hence, option B is correct