Question

A molecule that blocks the ion channels lining integral proteins in the plasma membrane would interfere with
(a) Cell recognition
(b) The movement of lipid-soluble molecules
(c) Producing changes in the electrical charges across a plasma membrane
(d) The ability of protein hormones to stimulate the cell
(e) The cell's ability to divide

Accepted Answer

Step 1: Understand the role of ion channels in the plasma membrane. Ion channels are integral membrane proteins that allow specific ions to pass through the membrane, contributing to the movement of charged particles across the membrane. Step 2: Recognize that blocking ion channels would prevent ions from moving across the membrane, which directly affects the electrical charge distribution on either side of the membrane. Step 3: Recall that changes in electrical charges across the plasma membrane are essential for processes like generating action potentials and maintaining membrane potential. Step 4: Evaluate each option in the problem: (a) Cell recognition involves surface markers, not ion channels; (b) Movement of lipid-soluble molecules occurs through the lipid bilayer, not ion channels; (c) Changes in electrical charges depend on ion movement through channels; (d) Protein hormones stimulate cells via receptors, not ion channels; (e) Cell division is a complex process not directly dependent on ion channels. Step 5: Conclude that blocking ion channels would most directly interfere with producing changes in electrical charges across the plasma membrane, corresponding to option (c).

비슷한 문제에 대한 검증된 영상 답변:

주요 개념

Ion Channels in Plasma Membrane

Membrane Potential and Electrical Charges

Cell Recognition and Signaling