26. Enzymes, responsible for unraveling short segments of DNA is

A. DNA polymerase
B. helicase
C. DNA ligase
D. primase

27. Enzyme, responsible for proofreading base pairing is

A. DNA polymerase
B. Telomerase
C. Primase
D. DNA ligase

28. Which of the following would not contain DNA?

A. Yeast
B. Bacteria
C. Glass crystals
D. Mold

29. The nucleosome consists of histone

A. octamer and 146 bp of DNA
B. tetramer and 146 bp of DNA
C. hexamer and 146 bp of DNA
D. none of the above

30. What bands will be observed in a cesium chloride gradient after two rounds of replication?

A. One light, one medium and one heavy band
B. One light and one medium band
C. One medium band
D. One medium and one heavy band