Structure of dsDNA Quiz | Structure of dsDNA Multiple Choice Questions(MCQs) & Answers
Questions
1
Which of them is used to introduce negative supercoiling in DNA?
Answer: Gyrase/ type 2 topoisomerase
2
What is the term given to the supercoiling of circular DNA?
Answer: Linking number
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3
Which of this factor is not responsible for thermal denaturation of DNA?
Answer: Humidity
4
The stability and formation of G-quadruplex depends on __________
Answer: Monovalent cation
5
Name the nitrogenous base which is found in abundance in G-quadruplex?
Answer: Guanine
6
The third strand of triple helix is paired in which scheme?
Answer: Hoogsteen base pair scheme
7
Which one of the following statement is INCORRECT for Z-DNA?
Answer: Anti glycosidic bond conformation
8
How many base pairs are there in every helical turn of Watson-Crick double helix model?
Answer: 10.4
11
Levene investigated and found that the nucleic acid is composed of poly-nucleotides and each nucleotide is composed of one base, a sugar molecule and a phosphate. This was performed on the genome of________________
Answer: Yeast
12
In the late 1970s non double helical form of DNA was also suggested but was discarded on the basis of certain factors. Which of the following is not a factor responsible?
Answer: Nuclein
13
With respect to the importance of hydrogen bonding and DNA double helix stability, which of the following statements is false?
Answer: Decreases the entropy
14
In a DNA double helix the bases are held together by hydrogen bonds. These hydrogen bonds are _________
Answer: Non-covalent bonds
15
The hydrogen bonds formed during A and T bonding occurs between C6NH2 of A and _____
Answer: C4O of T
16
What should be the complementary strand of 3’….ATGGCTTGA….5’?
Answer: 5’….TACCGAACT….3’
17
In 1952, an unambiguous established work in the laboratory of Alexander Todd led to the discovery of _____________
Answer: 3’-5’ phosphodiester linkage regularly links the nucleotides of DNA
18
In early 1950s high quality X-ray diffraction photographs of DNA suggesting the DNA being double helix and composed of two nucleotide strands. Who took those photographs?
Answer: Rosalind Franklin and Maurice Wilkins
19
The first X-ray diffraction patterns of DNA were taken in 1938 by ___________
Answer: William Asbury
