DNA Double Helix

Q.

What are the characteristics of DNA?

Q. The pitch of the DNA helix is:

1. 36 degrees

2. 360 degrees

3. 3.4 Angstrom

4. 34 Angstrom

Q.

DNA is a polymer of _______.

Q. Which of the following is/are correct for Watson-Crick model of DNA structure?

1. DNA is a double stranded helical structure.
2. The two strands of DNA are anti-parallel.
3. The two strands of DNA are parallel.
4. The pitch is 34 A$°$ containing 10 base pairs.

Q. Length of DNA segment having 200 nitrogen bases is _______.

1. $680\stackrel{\circ }{A}$
2. $340\stackrel{\circ }{A}$
3. $68000\stackrel{\circ }{A}$
4. $68\mu m$

Q. The double helix structure of the DNA was proposed by

1. Watson and Crick
2. Gregor Mendel
3. Carolus Linnaeus
4. Robert Whittaker

Q. The double-helix model of DNA structure was first proposed by ________.

1. Watson and Crick
2. Rosalind Franklin
3. Emil Fischer
4. Khorana

Q.

What is incorrect about DNA?

1. Sugar is pentose

2. Pyrimidine is uracil

3. Phosphodiester bonds between nucleotides

4. Glycosidic bond in nucleoside

Q. In an experiment, DNA was found to have $31\%$ adenine and $19\%$ guanine. The quantity of cytosine would have been ___________.

1. $38\%$
2. $31\%$
3. $19\%$
4. $62\%$

Q.

One strand of DNA has the following sequence of nucleotide 3’ATTCGCTAT5’ so the other strand of DNA has:

1. 5’ TAAGCGATA 3'

2. 3’ TAAGCGATA 5’

3. 5’ GACGCGATA 3’

4. 3’ GACGCGATA 5’