Questions and Answers

Topoisomerase:
– A. Separates the DNA strands at the origin
– B. Keeps the single-stranded DNA regions from coming back together
– C. Re-coils the DNA into a helix after replication is complete
– D. Breaks DNA backbone to remove tension produced by the helicase
– E. Breaks hydrogen bonds between DNA and the RNA primers

What end overhangs?

What kind of cells need cell replication of their telomeres?

What percent of all human cancers have high levels of telomerase?

If the problem of the telomeres were not solved, what would happen?

A repeating DNA sequence at the end of chromosomes that prevents them from losing base pair sequences at their ends and from fusing together is—
– A telomere
– A telomerase
– A replicon
– A primer
– A promoter

All are part of a nucleotide except—
– Pentose sugar
– Nitrogenous base
– Phosphate group
– Fatty acid tail
– All of the above are parts of a nucleotide

The enzyme that stitches Okazaki fragments together on the lagging strand is—
– DNA polymerase II
– DNA polymerase III
– Topoisomerase
– DNA ligase
– DNA helicase

A DNA strand has the sequence 5′ ATCGTTATGCAA 3′. What would be the sequence of the complementary strand?