Chapter 07: DNA Structure and Replication

Question 0

How many hydrogen bonds are between adenine and thymine?

Answer 0

Two

Question 1

How many hydrogen bonds are between cytosine and guanine?

Answer 1

Three

Question 2

What bonds nucleotides on the same strand?

Answer 2

Phosphodiester bonds

Question 3

What bonds connect nucleotides across strands?

Answer 3

Hydrogen bonds

Question 4

What is the role of topoisomerase?

Answer 4

Relaxes supercoiled DNA by cutting, rotating, and rejoining supercoiled areas

Question 5

What is the role of helicase?

Answer 5

Breaks hydrogen bonds to unwind DNA strands

Question 6

What is another name for helicase?

Answer 6

DnaB protein

Question 7

What is the role of single-strand binding proteins?

Answer 7

Coats single-stranded DNA to prevent reannealing

Question 8

What is the role of primase?

Answer 8

Synthesizes RNA primers on leading and lagging strands

Question 9

What is the role of DNA polymerase III?

Answer 9

Synthesizes DNA 5’ to 3’ continuously along the leading strand and discontinuously along the lagging strand

Question 10

What is the role of DNA polymerase I?

Answer 10

Removes nucleotides of RNA primers, replacing them with DNA nucleotides

Question 11

What is the role of DNA ligase?

Answer 11

Catalyzes phosphodiester bonds to join DNA segments/Okazaki fragments