nmdcat.online
BIO NMDCAT Structure of DNA
nmdcat.online July 3, 2026

10. In a double-stranded DNA molecule, the base-pairing pattern always obeys Chargaff’s rules, which state that the total amount of

A. Adenine equals cytosine
B. Purines equals pyrimidines
✓
C. Thymine equals guanine
D. Uracil equals thymine

📝 Explanation

Chargaff’s rules dictate that [A]=[T] and [G]=[C]; therefore, the sum of purines (A+G) must equal the sum of pyrimidines (T+C).

📖 Additional Information

  • Adenine equals cytosine
  • Purines equals pyrimidines
  • Thymine equals guanine
  • Uracil equals thymine

Chargaff’s rules dictate that [A]=[T] and [G]=[C]; therefore, the sum of purines (A+G) must equal the sum of pyrimidines (T+C).

🔗 Share This Question

Facebook Twitter LinkedIn WhatsApp

🧭 Navigate Questions

Previous Question

9. The scientific data that directly provided Watson and Crick with the structural dimensions and helical nature of DNA was derived from

Next Question

11. The vertical distance covered by one complete turn of the standard B-DNA double helix is

Back to All Questions

🔗 Related MCQs

An increase in the incidence of ectopic pregnancies within a population can often be epidemiologically correlated with a prior increase in the prevalence of which sexually transmitted disease?
July 16, 2026
In the life cycle of Herpes Simplex Virus 2 (HSV-2), the virus travels along nerve fibers to reach the sensory ganglia. The cellular mechanism responsible for this retrograde transport utilizes:
July 16, 2026
A defining characteristic of the lesions associated with the secondary stage of syphilis is that they:
July 16, 2026
The causative agent of genital herpes, HSV-2, is enveloped. The biological significance of this viral envelope in the context of transmission is that it makes the virus:
July 16, 2026
The structural basis for the severe cardiovascular complications seen in tertiary syphilis, such as aortic aneurysms, is the chronic inflammation and destruction of:
July 16, 2026

Categories

View all →