CBSE Class 12 Biology Molecular Basis of Inheritance Quiz 2

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CBSE › Class 12 › Biology › Molecular Basis of Inheritance

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1. A ribotide is made up of:

A Ribose + Phosphate + Uracil B Deoxribose + Uracil + Phosphate C Thymine + Ribose + Phosphate D Deoxyribpse + Phosphate + Adenine

2. the enzyme involved in transcription is:

A DNA Polymerase I B DNA Polymerase II C RNA Polymerase D DNA Polymerase

3. Antiparallel strands of a DNA molecule means that:

A One strand turns clockwise B One strand turns anticlockwise C The phosphate groups at the start of two DNA strands are in opposite position D The phosphate groups at the start of two DNA strands, at their ends, share the same position

4. Which one is mainly transcribed:

A Only RNA sequence B Middle repetitive DNA sequence C Highly repetitive DNA sequence D Single copy of DNA sequence

5. Amino acid sequence, in protein synthesis is decided by the sequence of?

A c-DNA B r-RNA C f-RNA D m-RNA

6. DNA multiplication is also called:

A Replication B Transduction C Translation D Transcription

7. During Protein synthesis, atone point the process comes to a halt. Select the group of the three codons from the following, from which any one of the three could bring about this halt:

A UUC, UUA, UAC B UAG, UGA, UAA C UUE, UCA, UCG D UUU, UCC, UAU

8. One turn of the helix in p-from DNA is approximately:

A 20 Å B 2 nm C 20 nm D 34 nm

9. Which is not component of lac operon:

A Primer gene B Promoter gene C constructive gene D Regulator gene

10. Okazaki fregments is:

A RNA primer B small segments of DNA on leading stand C Small segments of DNA on lagging stand D None of these

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