Chapter 20 - Chromosomes and DNA - 1


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Chapter 20 - Chromosomes and DNA - 1

1. Which structure become visible when cell starts dividing

a) Cell membrane
b) Nucleus
c) Chromosomes
d) Nuclear membrane

2. The centromeric position divides chromosomes into _______ types

a) 2
b) 6
c) 3
d) 4

3. The bond exists between N₂ bases of DNA is:

a) Phosphodiester
b) Hydrogen
c) Ionic
d) Covalent

4. The replication of DNA is always from

a) None
b) Both
c) 5′ – 3′
d) 3′- 5′

5. Attachment of okazaki fragments to DNA′s lagging strand is facilitated by:

a) DNA ase
b) Ligase
c) Polymerase II
d) Polymerase III

6. Sequence of specific nucleotide that results specific proteins is called:

a) Nucleotides
b) Chromosomes
c) Nucleoside
d) Gene

7. Formation of RNA from DNA is a process called:

a) Transcription
b) None
c) Translation
d) Replication

8. UAA represents

a) Promoters
b) Stop codon
c) Both a & b
d) Non sense codon

9. The caps and tails attached to mRNA protect it from:

a) Ligases
b) Nucleases and phosphatases
c) Polymerases
d) None

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