Lect 1&2 MCQ

Question 1

What are pyrimidine bases?

Answer 1

Uracil
Thymine
Cytosine

Question 2

What are purine bases?

Answer 2

Adenine

Guanine

Question 3

Central dogma of molecular biology does not involve:

Answer 3

Carbohydrates

Question 4

A nucleotide is not composed of

Answer 4

Methyl residues

Question 5

what does dATP stand for?

Answer 5

2’-deoxyadenosine-5’-triphosphate

Question 6

Principle difference between a nucleoside and a nucleotide is

Answer 6

Nucleosides don’t contain phosphate groups

Question 7

What are strands of DNA helix held together by?

Answer 7

H bonds

Question 8

Cellular DNA replication requires

Answer 8

Primase

Question 9

Phosphodiester bonds are formed

Answer 9

5’-3’

Question 10

DNA polymerase

Answer 10

Catalyses DNA synthesis
Requires RNA primer
Uses old strand as template
Begins at replication origin

Question 11

During DNA replication the fragments made on lagging strand are

Answer 11

Okazaki fragments

Question 12

During DNA replication, DNA ligases enzyme carries out:

Answer 12

Joining Okazaki fragments

Question 13

The enzyme that requires ATP to break the H bonds between 2 bases to open up the DNA ahead of the replication fork is:

Answer 13

Helicase

Question 14

Which enzyme relieves twists in DNA ahead of replication fork?

Answer 14

Topoisomerase

Question 15

DNA replication is

Answer 15

Semi conservative