Chargaff's rule states that in an organism:

1.	The amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C).
2.	The amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C).
3.	The amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G).
4.	Amounts of all bases are equal.

During translation initiation in prokaryotes, a GTP molecule is needed in: 

In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids:

1. 20

2. 64

3. 61

4. 60

What does "lac" refer to in what we call the lac operon:

1. Lactose

2. Lactase

3. Lac insect

4. The number 1,00,000

Degeneration of a genetic code is attributed to the:

1. First member of a codon

2. Second member of a codon

3. Entire codon

4. Third member of a codon

During transcription, the DNA site at which RNA polymerase binds is called:

1. Promoter

2. Regulator

3. Receptor

4. Enhancer

What would happen if in a gene encoding a polypeptide of 50 amino acids, the 25th codon (UAU) is mutated to UAA?

Which one of the following triplet codes, is correctly matched with its specificity for an amino acid in protein synthesis or as a 'start' or 'stop' codon:

1. UCG – Start

2. UUU – Stop

3. UGU – Leucine

4. UAC – Tyrosine

In Negative operon:
1.  Inducer binds with repressor
2.  Co-repressor does not bind with repressor
3.  Corepressor binds with inducer
4.  CAMP has a negative effect on the lac operon

Due to the discovery of which of the following in 1980, the evolution was termed as RNA world?