Selected MCQ

Current Question
During DNA replication, the leading strand is synthesized:
  • A. Continuously in the 5' to 3' direction
  • B. Continuously in the 3' to 5' direction
  • C. Discontinuously away from the fork
  • D. Only after lagging strand is completed
Correct Answer: A
Explanation:
DNA polymerases extend only 5' to 3', allowing continuous synthesis toward the fork on one template.
Related Question 1
Crossing over during meiosis contributes directly to:
  • A. DNA replication arrest
  • B. Genetic recombination
  • C. Chromosome number doubling
  • D. Cytokinesis prevention
Correct Answer: B
Explanation:
Exchange between homologous chromatids creates new allele combinations.
Related Question 2
A body projected vertically upward from Earth’s surface neglecting air resistance will have which quantity conserved during flight if Earth’s rotation is neglected?
  • A. Kinetic energy only
  • B. Momentum only
  • C. Mechanical energy
  • D. Gravitational force
Correct Answer: C
Explanation:
In a uniform conservative gravitational field with no dissipation, total mechanical energy is conserved.