TABLE 03 - Important DNA Enzymes

Question 1

Relaxes supercoiling ahead of the replication fork (Important DNA enzymes)

Answer 1

DNA gyrase

Question 2

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

Answer 2

DNA ligase

Question 3

Synthesize DNA; proofread and facilitate repair of DNA (Important DNA enzymes)

Answer 3

DNA polymerases

Question 4

Cut DNA backbone in a strand of DNA; facilitate repair and insertions (Important DNA enzymes)

Answer 4

Endonucleases

Question 5

Cut DNA from an exposed end of DNA; facilitate repair (Important DNA enzymes)

Answer 5

Exonucleases

Question 6

Unwinds double-stranded DNA (Important DNA enzymes)

Answer 6

Helicase

Question 7

Add methyl group to selected bases in newly made DNA (Important DNA enzymes)

Answer 7

Methylase

Question 8

Uses visible light energy to separate UV-induced pyrimidine dimers (Important DNA enzymes)

Answer 8

Photolyase

Question 9

An RNA polymerase that makes RNA primers from a DNA template (Important DNA enzymes)

Answer 9

Primase

Question 10

RNA enzyme that remove introns and splices exons together (Important DNA enzymes)

Answer 10

Ribozyme

Question 11

Copies RNA from a DNA template (Important DNA enzymes)

Answer 11

RNA polymerase

Question 12

RNA-protein complex that removes introns and splices exons together (Important DNA enzymes)

Answer 12

snRNP

Question 13

Relaxes supercoiling ahead of the replication form; separates DNA circles at the end of DNA replication (Important DNA enzymes)

Answer 13

Topoisomerase/Gyrase

Question 14

Cuts DNA backbone, leaving single-stranded “sticky ends” (Important DNA enzymes)

Answer 14

Transposase