FREE Biochemistry Genetic and Molecular Biology Questions and Answers
Which of the following is true about the DNA replication?
DNA replication is semiconservative, meaning each new DNA molecule consists of one original parent strand and one newly synthesized strand. It occurs during the S-phase of the cell cycle and requires RNA primers to initiate synthesis.
Which enzyme is responsible for unwinding the DNA double helix replication?
Helicase unwinds the DNA double helix at the replication fork, enabling the replication machinery to access the template strands. Topoisomerase relieves supercoiling caused by unwinding.
In transcription, which of the following statements is correct?
RNA polymerase synthesis RNA in the 5' to 3' direction using one strand of DNA as the template. In eukaryotes, transcription occurs in the nucleus, and the RNA detaches from the DNA template once transcription is complete.
Which of the following is NOT involved in post-transcriptional modification of eukaryotic mRNA?
Post-transcriptional modifications in eukaryotic mRNA include adding a 5' cap, splicing to remove introns, and polyadenylation at the 3' end. Primer are used in DNA replication, not in mRNA modification.
Which of the following best describes the function of tRNA in translation?
tRNA molecules carry specific amino acids to the ribosome and match them to their corresponding codons on the mRNA using the anticodon sequence.