Selected MCQ

Current Question
Action potentials in neurons propagate because of sequential opening of:
  • A. Ligand-gated chloride channels only
  • B. Voltage-gated sodium and potassium channels
  • C. Aquaporins
  • D. Calcium pumps only
Correct Answer: B
Explanation:
Depolarization and repolarization are driven mainly by voltage-gated Na(^+) and K(^+) channels.
Related Question 1
Which reaction forms ester?
  • A. Hydrolysis
  • B. Esterification
  • C. Oxidation
  • D. Reduction
Correct Answer: B
Explanation:
Acid + alcohol forms ester.
Related Question 2
Which reaction releases electrons?
  • A. Reduction
  • B. Oxidation
  • C. Neutralization
  • D. Precipitation
Correct Answer: B
Explanation:
Oxidation is loss of electrons.
Related Question 3
Which interaction has shortest range?
  • A. Gravitational
  • B. Electromagnetic
  • C. Weak
  • D. Strong
Correct Answer: C
Explanation:
Weak force acts over very short distances.
Related Question 4
Which wave shows diffraction?
  • A. Light
  • B. Sound
  • C. Water
  • D. All
Correct Answer: D
Explanation:
All waves diffract.
Related Question 5
Which reaction produces polymer?
  • A. Hydrolysis
  • B. Polymerization
  • C. Oxidation
  • D. Reduction
Correct Answer: B
Explanation:
Polymerization links monomers.