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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Hints

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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Hints

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 |
 66%
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Hints

hn-RNA undergoes two additional processing. Out of which, in one of them an unusual nucleotide (methyl guanosine triphosphate) is added to the 5’-end of hnRNA. This is known as

(1) capping

(2) tailing

(3) splicing

(4) termination

Subtopic:  Transcription: IV | Transcription |
 86%
From NCERT
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James Watson and Francis Crick got Nobel prize in the year

(1) 1960

(2) 1962

(3) 1959

(4) 1953

Subtopic:  DNA Double Helix |
 54%
From NCERT
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Polymerisation of which of the following produces Nucleic acids?

(1)Nucleosides

(2)Nucleotides

(3)DNA and RNA

(4)Both 1 and 2

Subtopic:  The DNA |
 68%
From NCERT
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Which of the following is a genetic material in most of the organisms?

(1)DNA

(2)RNA

(3)Both DNA and RNA

(4)Nucleic Acid

Subtopic:  DNA vs RNA as Genetic Material |
 88%
From NCERT
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Which of the following can act as genetic material?

(1)RNA only

(2)DNA only

(3)DNA but not RNA

(4)DNA and RNA

Subtopic:  The DNA | DNA vs RNA as Genetic Material |
 86%
From NCERT
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RNA cannot act as

(1)Adapter molecule

(2)Catalytic molecule

(3)Respiratory substrate

(4)Genetic material

Subtopic:  The DNA |
 86%
From NCERT
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