Selected MCQ

Current Question
Which base pairs with adenine in DNA?
  • A. Cytosine
  • B. Guanine
  • C. Thymine
  • D. Uracil
Correct Answer: C
Explanation:
A pairs with T in DNA.
Related Question 1
Which base is strong?
  • A. NH₃
  • B. NaOH
  • C. CH₃COOH
  • D. H₂O
Correct Answer: B
Explanation:
NaOH fully dissociates.
Related Question 2
Which base turns red litmus blue?
  • A. Acid
  • B. Base
  • C. Neutral
  • D. Salt
Correct Answer: B
Explanation:
Bases change litmus color.
Related Question 3
Which compound is strongest base?
  • A. NH₃
  • B. OH⁻
  • C. CH₃COO⁻
  • D. Cl⁻
Correct Answer: B
Explanation:
Hydroxide is strong base in water.
Related Question 4
Which base is found in RNA but not DNA?
  • A. Thymine
  • B. Cytosine
  • C. Uracil
  • D. Guanine
Correct Answer: C
Explanation:
RNA uses uracil instead of thymine.
Related Question 5
Independent assortment occurs because homologous chromosome pairs:
  • A. Replicate at different times
  • B. Align randomly at metaphase I
  • C. Separate in mitosis only
  • D. Undergo mutation during cytokinesis
Correct Answer: B
Explanation:
Random orientation of homologs generates different combinations in gametes.