DNA Structure Practice Questions
20 free DNA Structure practice questions for the Botany, each with the correct answer and a detailed explanation. Open any question below, or take the full set as an interactive quiz.
Questions
20 questions
All DNA Structure questions
- Q1. Which of the following components forms the 'backbone' of a DNA strand?
- Q2. According to Chargaff's rules, if a DNA sample contains 20% Adenine, what is the percentage of Guanine?
- Q3. What type of chemical bond holds the two complementary strands of DNA together?
- Q4. The 'double helix' model of DNA was first proposed by Watson and Crick based on X-ray diffraction data produced by:
- Q5. Which nitrogenous base is found in DNA but is replaced by Uracil in RNA?
- Q6. What is the specific orientation of the two strands in a DNA molecule?
- Q7. The width of a standard B-DNA double helix is approximately:
- Q8. Which of the following is a purine base?
- Q9. In the DNA structure, the nitrogenous base is attached to the sugar molecule at which carbon position?
- Q10. What is the primary difference between the sugar in DNA and the sugar in RNA?
- Q11. One full turn of the B-DNA helix contains approximately how many base pairs?
- Q12. The 'Major Groove' and 'Minor Groove' in DNA are important because they:
- Q13. DNA packaging in eukaryotic plant cells involves wrapping DNA around proteins called:
- Q14. Which DNA form is a left-handed helix?
- Q15. A 'Nucleoside' is composed of:
- Q16. Phosphodiester bonds link which two parts of adjacent nucleotides?
- Q17. Why is the G-C base pair more stable than the A-T base pair?
- Q18. The rise per base pair (the distance between two consecutive rungs) in B-DNA is:
- Q19. Denaturation of DNA refers to:
- Q20. Circular DNA molecules are commonly found in which plant cell compartments?