CBSE Class 12 Biology Molecular Basis of Inheritance Quiz 1

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CBSE › Class 12 › Biology › Molecular Basis of Inheritance

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1. Represser Lac-Operon protein attached to:

A Operator B Inducer C Regulator D β-Glacto sidase

2. Following is important in Ïranscription:

A DNA Methylase B CAAT Box C Promotar D DNA Polymerase

3. Anticodon found in:

A On DNA B On t-RNA C On r-RNA D On m-RNA

4. In DNA helix:

A Quadrate structure B Polarity C Antiparallel Polarity D Disuiphide bond

5. During splicing axon attached and inducer enzyme for reaction:

A RNA Ligase B RNA Catalase C RNA permease D RNA poloymerase

6. During DNA synthesis formed segment is:

A Polymerase fragment B RNA fragment C Okazaki fragment D RNA Primer

7. In a give DNA segment ATC ACC AGG ACC CCA ACA, the first base gets mutated. The effect of this on coding by the DNA segment will result in :

A One amino acid less in protein B No change in the sequence C Complete change in the type and sequence of amino acid D Change in first amino acid only

8. DNA fragments are joined in a correct sequence by :

A DNA ligase B RNA polymerase C Helicase D DNA polymerase

9. The ratio constant for a species is :

A T+C/G + A B A+C/T + G C G + G/A + T D A + C/C + T

10. DNA repairing is done by:

A By DNA polymerase I B By DNA Polymerase II C Both (a) and (b) D By Ligase

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