23. The enzyme that unzips or separates the DNA molecule during replication is _

Question

23. The enzyme that unzips or separates the DNA molecule during replication is ______________.

a.DNA ligase

b. Helicase

c. DNAase

d. DNA polymerase

24. The enzyme that catalyzes DNA synthesis (adds nucleotides to the DNA molecule) is called

a.DNA ligase

b. gyrase

c. helicase

d.DNA polymerase

25. Okazaki fragments indicate that the replication of the lagging strand is______________.

a. continuous

b. discontinuous

c. sporadic

d. 3' to 5'

26. If you wanted to research how cancer cells or different cell types (e.g., muscle, heart, lung) differ from one another using DNA chips, you would extract which of the following from the cells:

a. DNA    

b. mRNA

c. proteins

d. None of the above

Explanation / Answer

23. b. Helicase.

The enzyme that unzips or separates the DNA molecule during replication is helicase.

Replication fork thus moves with the help of helicase enzyme.

25. b. discontinuous

Okazaki fragments indicate that the replication of the lagging strand is discontinuous.

The lagging strand is discontinuously synthesized whereas leading strand is continuously synthesized.

26. a. DNA

For conducting DNA chips we need DNA from cells.

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