Nucleic Acids

Question 1

Nucleosides =

2

Answer 1

Sugar + nucleic acid base

Question 2

DEOXYRIBONUCLEIC ACID (DNA) primary structures (4)

Answer 2

see slide

Question 3

DNA sugar (deoxyribose) structure

Answer 3

see slide

Question 4

Nucleic acid bases

Purines (2)

Answer 4

Adenine & guanine

Question 5

Nucleic acid bases

Pyrimidines

Answer 5

cytosine and thymine

Question 5

Nucleic acid bases

Pyrimidines

Answer 5

cytosine and thymine

Question 6

adenine structure

Answer 6

see slide

Question 7

guanine structure

Answer 7

see slide

Question 8

cytosine structure

Answer 8

see slide

Question 9

thymine structure

Answer 9

see slide

Question 10

Where is the 5’ end on a nucleoside?

Answer 10

Top

Question 11

Where is the 3’ end on the nucleoside?

Answer 11

Bottom

Question 12

Is the sugar backbone constant?

Answer 12

Yes

Question 13

In what order are the bases appearantly attached on a nucleoside?

Answer 13

Random

Question 14

What is the secondary structure of DNA?

Answer 14

Double helix

Question 15

What do you call the wider gap in a double helix?

Answer 15

Major groove

Question 16

What do you call the smaller gap in a double helix?

Answer 16

Minor groove

Question 17

Size of minor groove?

Answer 17

10 A

Question 18

Size of major groove?

Answer 18

34 A

Question 19

Base pairing of thymine?

Answer 19

Adenine

Question 20

Base pairing of guanine?

Answer 20

Cytosine

Question 21

G-C base pairing involves ____ H bonds

Answer 21

3

Question 22

A-T base pairing involves___ H bonds

Answer 22

2

Question 23

Does the sugar phosphate backbone have a favourable interaction with water?

Answer 23

Yes

Question 24

Is the sugar phosphate backbone ionised or unionised?

Answer 24

Ionised

Question 25

Are chains complementary or uncomplementary?

Answer 25

Complementary

Question 26

What direction does the sugar phosphate backbone face?

Answer 26

Outward