1st

Question 1

The link between ribose and phosphate is

Answer 1

Ester bond

Question 2

The link between ribose and nitrogenous base is

Answer 2

glycosidic bond

Question 3

Nucleotides are linked with each other by

Answer 3

Ester bond(phosphodiester bond)

Question 4

Adnenin and thymin hydrogen bonds number

Answer 4

2

Question 5

Guanine and cytosine hydrogen bonds number

Answer 5

3

Question 6

DNA consists of what

Answer 6

Two strands of polyneuclutides

Question 7

The nuclutides The phosphodiester bond is between what

Answer 7

The phosphate at 5 and hydroxyl group of the ribose suger at the 3 end

Question 8

What is the plasmids

Answer 8

Small circular extrachromosomal DNA molecules

Question 9

What does chromatin contain

Answer 9

DNA molecules, histones, non-histone proteins, RNA

Question 10

What does The non-histone proteins class include

Answer 10

Various transcriptional factors , polymerases, hormone receptors, nuclear enzymes

Question 11

All cellular functions depend on what

Answer 11

Protiens

Question 12

What is the DNA 1ry structure

Answer 12

The sequence of nucleotides

Question 13

What determines the coding structure of DNA

Answer 13

The sequence of bases

Question 14

Stability of the helix is provided by what

Answer 14

1. Van Der waals forces
2. Hydrophobic interactions
3. Hydrogen bonding between complementary base pairs

Question 15

Van Der waals distance

Answer 15

0.3 to 0.4

Question 16

What molecules make the hydrophobic interaction

Answer 16

Nonpolar molecules that cannot form hydrogen bonds with water

Question 17

Which atom of pyrimidine is linked to the carbon of ribose

Answer 17

Carbon num 1

Question 18

Which atom of purine is linked to the carbon of ribose

Answer 18

Carbon num 9