In the lac operon model, lactose molecules function as:-

(1) inducers, which bind with the operator
gne

(2) repressors, which bind with the operator
gene

(3) inducers, which bind with the repressor
protein

(4) corepressors, which bind with repressors
protein

A recessive mutant is one which is

(1) not expressed

(2) rarely expressed

(3) expressed only in homozygous and hemizygous state

(4) expressed only in heterozygous state

If the total amount of adenine and thymine in a double-stranded DNA is 60%, the amount of guanine in this DNA will be

(1) 15%

(2) 20%

(3) 30%

(4) 40%

If T = 40%, C = 10% then G = ? in a pollen cell

(1) 40%

(2) 10%

(3) 91%

(4) 20%

Translocase is an enzyme required for

(1) DNA replication

(2) RNA synthesis

(3) initiation of protein synthesis

(4) protein synthesis chain elongation

Centre of DNA Fingerprinting and Diagnostics (CDFD) is located at

(1) Delhi

(2) Chennai

(3) Kolkata

(4) Hyderabad

In a bacterium, the amount of adenine was found to be 18 per cent. Suggest the cytosine base composition from the following

(1) 64%

(2) 36%

(3) 32%

(4) 18%

In which of the following combinations, the compounds in ascending order based on their molecular weights are arranged?

(1) DNA, RNA, AMP, ADP, ATP

(2) DNA, RNA, ATP, ADP, AMP

(3) AMP, ADP, ATP, RNA, DNA

(4) AMP, ATP, ADP, DNA, RNA

If a segment of an mRNA molecule has the sequence 5’ GUACCGAUCG 3’, which of the following could have been the template DNA molecule?

(1) 3’ GCUAGCCAUG 5’

(2) 3’ GUACCGAUCG 5’

(3) 3’ CATGGCTAGC 5’

(4) 3’ CGATCGGTAC 5’

In prokaryotes, the process of replication is catalysed by the following enzymes. Identify which of the enzymes is best coordinate with the role.