Q. Termination of replication is triggered by
(a) DNA polymerase
(b) Helicase
(c) SSB
(d) Tus protein
Answer: : (d)
Q. DNA polymerase synthesizes
(a) DNA in 5’-3’ direction
(b) DNA in 3’-5’ direction
(c) mRNA in 3’-5’ direction
(d) mRNA in 5’-3’ direction
Answer: : (a)
Q. Association of histones H1 with nucleosome shows
(a) the occurrence of transcription
(b) the occurrence of replication
(c) exposed DNA double helix
(d) the condensation of DNA into chromatin fibre
Answer: : (d)
Q. The 3’ – 5’ phosphodiester linkage joins
(a) two DNA strands
(b) two nucleotides
(c) a nitrogenous base with pentose sugar
(d) two nucleosides
Answer: : (b)
Q. The fragments of DNA are joined together by which of the following enzymes?
(a) Endonuclease
(b) DNA polymerase
(c) Primase
(d) Ligase
Answer: : (d)
Q. During replication, Okazaki fragments elongate
(a) leading strand towards the replication fork
(b) lagging strand towards the replication fork
(c) leading strand away from the replication fork
(d) lagging strand away from the replication fork
Answer: : (d)
Q. Which of the following enzymes separates the two strands of DNA during replication?
(a) Gyrase
(b) Topoisomerase
(c) Helicase
(d) DNA polymerase
Answer: : (c)
Q. DNA replication is
(a) conservative
(b) conservative and discontinuous
(c) semi-conservative and discontinuous
(d) semi-conservative and semi-discontinuous
Answer: : (d)
Q. Which of the following is used in DNA replication studies?
(a) Neurospora crassa
(b) Drosophila melanogaster
(c) Escherichia coli
(d) Pneumococcus
Answer: : (c)
Q. Which of the following helps in opening of DNA double helix in front of replication fork?
(a) topoisomerase
(b) DNA polymerase-I
(c) DNA gyrase
(d) DNA ligase
Answer: : (c)
