Home > General Studies (Hindi) > Quizzes > Life Sciences Practice Test: Structure of dsDNA
Life Sciences Practice Test: Structure of dsDNA
Fast practice, instant feedback. Timer auto-submits when time’s up.
Avg score: 58% Most missed: “How many base pairs are there in every helical turn of Watson-Crick double helix…”

Double-stranded DNA (dsDNA) is a double helix, meaning it has two strands that twist around each other like a spiral staircase. The strands run antiparallel, with the 5' end of one strand parallel to the 3' end of the other.

The structure of dsDNA includes:
Backbone:
The outside of the molecule, made of alternating deoxyribose sugars and phosphates.
Nucleotides: A repeated pattern of a phosphate group, a sugar group, and a base.
Hydrogen bonds: Non-covalent bonds that bind the strands together.

Life Sciences Practice Test: Structure of dsDNA
Time left 00:00
11 Questions

1. How many base pairs are there in every helical turn of Watson-Crick double helix model?
2. Who described the structure of DNA double helix?
3. Which one of the following statement is INCORRECT for Z-DNA?
4. Double-stranded DNA with high GC content has higher thermal stability than that of lower GC content?
5. Which of this factor is not responsible for thermal denaturation of DNA?
6. The third strand of triple helix is paired in which scheme?
7. Which form of DNA is described by Watson-Crick model?
8. The stability and formation of G-quadruplex depends on __________
9. What is the term given to the supercoiling of circular DNA?
10. Which of them is used to introduce negative supercoiling in DNA?
11. Name the nitrogenous base which is found in abundance in G-quadruplex?