Jumping genes given by Barbara Mclintock are also called

1

(a)

Transposons

(b)

Mutons

(c)

Cistrons

(d)

Vectors

Temin and Baltimore are associated with the discovery of

1

(a)

RNA synthesis

(b)

Transcription

(c)

Reverse transcription

(d)

photorespiration

How many codons code for amino acids?

1

(a)

64

(b)

61

(c)

68

(d)

60

How many base pairs are present in DNA cut by endonuclease

1

(a)

2

(b)

4

(c)

6

(d)

8

In DNA, guanine and cytosine are bonded with how many hydrogen bonds?

1

(a)

1

(b)

2

(c)

3

(d)

4

Out of 64 codons how many codons do not code for any amino acid?

1

(a)

62

(b)

61

(c)

3

(d)

1

Initiator (starting) codon in eukaryotes is

1

(a)

AUG

(b)

AAG

(c)

CCU

(d)

GGC

Intrinsic flow of information means

1

(a)

Transcription

(b)

Translation

(c)

Both of the above

(d)

None of the above

During replication of a bacterial chromosome DNA synthesis starts from a replication origin site and

1

(a)

is facilitated by telomerase

(b)

moves in one direction of the site

(c)

moves in bi-directional way

(d)

RNA primers are involved

The number of codons that code different amino acids is

1

(a)

16

(b)

31

(c)

61

(d)

64

Which of the two subunits of ribosome encounters an mRNA?

1

(a)

Small subunit

Which one is tailed with adenylate residue between 3' end and 5'end of hnRNA?

1

(a)

3' end

Name two basic amino acids that provide positive charge to histone proteins.

1

(a)

Lysine and Arginine

Mention the role of codons AUG and UGA during protein synthesis.

1

(a)

AUG codes for methionine and it is the initiation codon.

How is a nucleotide different from a nuclioside different from a nucleoside?

1

(a)

A nucliotide has a phosphate along with the pentose sugar and nitrogenous base; a nucleoside has only the pentose sugar and nitrogenous base.

How are the consecutive nucleotides linked together in a polynucleotide strands?

1

(a)

Consecutive nucleotides are attached through 3'-5' phosphodiester linkage.

What forms the backbone of a polynucleotide strand of a nucleic acid?

1

(a)

Pentose sugar and phosphate

Write the other chemical name for thymine.

1

(a)

5' methyl uracil.

Who discovered the nucleic acid DNA? What was it called then?

1

(a)

Frederich Meischer discovered DNA. 

It was called

State the dual role of deoxyribonucleoside triphosphates during DNA replication

2

(a)

How does DNA express its biological information?

2

(a)

What do you understand by genome.

2

(a)

Discuss the role the enzyme DNA ligase plays during DNA replication.

2

(a)

1. Explain the role DNA-dependent RNA-polymerase in transcription

   2

   (a)

There are certain complexities in eukaryotic transcription.Bring out the significance of such complexities.

3

(a)