Cell Membrane Structure and Function Practice Questions

Question 1

Assertion: RMP depends on proteins and phosphate ions.
Reason: Diffusion potential can be calculated using nernst equation.
Choose the best statement regarding the assertion and reason.

Accepted Answer

Both true, Reason is not the explanation of assertion

Answer

Assertion false, Reason true

Answer

Both true, Reason is the explanation of assertion

Answer

Assertion true, Reason false

Question 2

Which of the following statements about the Na-K pump is false?

Accepted Answer

It is located on the apical membrane of cell

Answer

It is not directly involved in the generation of action potentials.

Answer

It is electrogenic

Answer

It needs ATP for its functioning

Question 3

Which of the following statements accurately describes G proteins?

Accepted Answer

Are associated with cellular membranes and play a crucial role in signal transduction.

Answer

Regulate second messengers like cyclic adenosine monophosphate (cAMP).

Answer

Play a role in the amplification of hormonal signals.

Answer

Consist of three subunits: alpha, beta, and gamma.

Question 4

Which of the following is the primary mechanism that drives sodium reabsorption in the proximal tubule?

Accepted Answer

Active sodium transport via the Na+-K+-ATPase pump at the basolateral membrane.

Answer

Sodium reabsorption through cotransport with amino acids at the luminal membrane.

Answer

Sodium reabsorption through cotransport with glucose at the luminal membrane.

Answer

Sodium reabsorption through countertransport with hydrogen ions at the luminal membrane.

Question 5

Which ion movement is primarily responsible for hyperpolarization of the cell membrane?

Accepted Answer

Potassium (K+) efflux

Answer

Chloride (Cl-) influx

Answer

Sodium (Na+) influx

Answer

None of the options

Question 6

Some cells secrete chemicals into the extracellular fluid that act on cells in the same tissue. Which of the following refers to this type of regulation?

Accepted Answer

Paracrine

Answer

Neural

Answer

Endocrine

Answer

Neuroendocrine

Question 7

Magnesium is not involved in ?

Accepted Answer

Hemoglobin synthesis

Answer

Cellular oxidation

Answer

Membrane transport

Answer

Glucose tolerance

Question 8

HIV envelope is formed by:

Accepted Answer

Both

Answer

Host cell

Answer

Virus

Answer

None of the options

Question 9

Which of the following statements about apoptosis is not true?

Accepted Answer

Cellular swelling

Answer

Nuclear compaction

Answer

Intact cell membrane

Answer

Formation of apoptotic bodies

Question 10

Equilibrium potential for an ion is calculated by:

Accepted Answer

Nernst Equation

Answer

Gibbs Donnan Equilibrium

Answer

Goldman Equation

Answer

None of the options

Cell Membrane Structure and Function — MCQs

Cell Membrane Structure and Function — MCQs

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