TABLE 03 - Important DNA Enzymes

Question 1

Relaxes supercoiling ahead of the replication fork

Answer 1

DNA gyrase

Question 2

Makes covalent bonds to join DNA strands; Okazaki fragments, and new segments in excision repair

Answer 2

DNA ligase

Question 3

Synthesize DNA; proofread and facilitate repair of DNA

Answer 3

DNA polymerases

Question 4

Cut DNA backbone in a strand of DNA; facilitate repair and insertions

Answer 4

Endonucleases

Question 5

Cut DNA from an exposed end of DNA; facilitate repair

Answer 5

Exonucleases

Question 6

Unwinds double-stranded DNA

Answer 6

Helicase

Question 7

Add methyl group to selected bases in newly made DNA

Answer 7

Methylase

Question 8

Uses visible light energy to separate UV-induced pyrimidine dimers

Answer 8

Photolyase

Question 9

An RNA polymerase that makes RNA primers from a DNA template

Answer 9

Primase

Question 10

RNA enzyme that remove introns and splices exons together

Answer 10

Ribozyme

Question 11

Copies RNA from a DNA template

Answer 11

RNA polymerase

Question 12

RNA-protein complex that removes introns and splices exons together

Answer 12

snRNP

Question 13

Relaxes supercoiling ahead of the replication form; separates DNA circles at the end of DNA replication

Answer 13

Topoisomerase/Gyrase

Question 14

Cuts DNA backbone, leaving single-stranded “sticky ends”

Answer 14

Transposase