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

Subtopic:  Gene Regulation: Lac Operon |
 72%
From NCERT
AIIMS - 2012
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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

 69%
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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%

Subtopic:  The DNA |
 80%
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If T = 40%, C = 10% then G = ? in a pollen cell

(1) 40%

(2) 10%

(3) 91%

(4) 20%

Subtopic:  The DNA |
 92%
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Translocase is an enzyme required for

(1) DNA replication

(2) RNA synthesis

(3) initiation of protein synthesis

(4) protein synthesis chain elongation

Subtopic:  Translation Mechanism |
 59%
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Centre of DNA Fingerprinting and Diagnostics (CDFD) is located at

(1) Delhi

(2) Chennai

(3) Kolkata

(4) Hyderabad

Subtopic:  DNA Fingerprinting |
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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%

Subtopic:  The DNA |
 86%
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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

Subtopic:  The DNA |
 61%
AIIMS - 2010
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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’

Subtopic:  Transcription:II | Transcription |
 85%
From NCERT
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In prokaryotes, the process of replication is catalysed by the following enzymes. Identify which of the enzymes is best coordinate with the role.

(1) Helicase

 –

Joins the ends of DNA segments

(2) DNA polymerase-I

 –

Synthesises DNA

(3) DNA polymerase-II

 –

Erases primer and fills gaps

(4) Primase

 –

Synthesises RNA primers

 

Subtopic:  DNA Replication: II | DNA Replication |
 65%
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