Free Biochemistry Genetic and Molecular Biology Questions and Answers

Question 1

Which of the following is true about the DNA replication?

Accepted Answer

It is semiconservative, where each daughter DNA molecule has one parent and one new strand.

Answer

It occurs only during mitosis.

Answer

It is conservative, where both parent strands remain together.

Answer

It does not require a primer to start synthesis.

Question 2

Which enzyme is responsible for unwinding the DNA double helix replication?

Accepted Answer

Helicase

Answer

DNA polymerase

Answer

Ligase

Answer

Topoisomerase

Question 3

In transcription, which of the following statements is correct?

Accepted Answer

RNA polymerase synthesizes RNA in the 5' to 3' direction.

Answer

Both DNA strands are transcribed into RNA.

Answer

Transcription occurs in the cytoplasm of eukaryotic cells.

Answer

The newly synthesized RNA remains permanently bound to the DNA template.

Question 4

Which of the following is NOT involved in post-transcriptional modification of eukaryotic mRNA?

Accepted Answer

Addition of a primer

Answer

5' capping

Answer

Splicing out introns

Answer

Polyadenylation at the 3' end

Question 5

Which of the following best describes the function of tRNA in translation?

Accepted Answer

Carries amino acids to the ribosome and matches them to the mRNA codon.

Answer

Catalyzes peptide bond formation between amino acids.

Answer

Acts as the template for protein synthesis.

Answer

Transports mRNA from the nucleus to the cytoplasm.