LESSON 5B: Nucleic acid, double helix, supercoiling

Question 1

What organic compound contains one heterocylic ring in Nucleic acid?

Answer 1

Pyrimidine

Question 2

What organic compound contains fused heterocylic rings in nucleic acid?

Answer 2

Purine

Question 3

What nucleotide bases are example of Pyrimidine?

Answer 3

Cytosine, Uracil, Thymine

Question 4

What nucleotide bases are example of Purine?

Answer 4

Adenine and Guanine

Question 5

A bond that connects phosphate group though ester linkage.

Answer 5

Phosphodiester bond

Question 6

DNA is _______ handed.

Answer 6

DNA is right handed.

Question 7

What is the backbone of the double helix of DNA?

Answer 7

Sugar-phosphate

Question 8

How many nucleotide base pairs are there in one helical turn?

Answer 8

10 base pairs

Question 9

How is DNA helix arranged in?

Answer 9

3’-5’ to 5’-3’

Question 10

What caused the DNA to helical?

Answer 10

The two strands wrapped around each other.

Question 11

What enzyme or topoisomerase processes DNA into supercoiling due to large molecule of DNA?

Answer 11

DNA gyrase

Question 12

At what cell supercoiling happens?

Answer 12

Only at Prokaryotes, due to DNA is linear.

Question 13

What is the counter part of supercoiling for Eukaryotes?

Answer 13

Wounding DNA around histones.