Chapter 5 - quiz

Question 1

pyridamines

Answer 1

• single ring
  1. thymine
  2. cytosine

Question 2

purines

Answer 2

• 2 rings
  1. adenine
  2. guanine

Question 3

thymine and adenine have ___ hydrogen bonds

Answer 3

2

Question 4

cytosine and guanine have ___ hydrogen bonds

Answer 4

3

Question 5

3’

Answer 5

• OH- group attached
• continuous
• hydroxyl end
• no DNA loss
• nucleotides attach here

Question 6

5’

Answer 6

• phosphate attached
• lagged replication of the 5’ end
• loss of DNA

Question 7

DNA replication

Answer 7

• process of producing 2 identical DNA molecules from an original (parent) DNA molecule
• occurs during S phase of interphase

Question 8

semi conservative replication

Answer 8

• one strand of parent DNA conserved and one is newly synthesized
• correct theory

Question 9

conservative replication

Answer 9

forms 2 new daughter strands from parental template

Question 10

dispersive

Answer 10

original DNA chunked and dispersed into the newly synthesized

Question 11

helicase

Answer 11

binds to DNA and unwinds double helix

Question 12

topiosomerase

Answer 12

relieves strain on the double helix being separated

Question 13

DNA Polymerase III

Answer 13

catalyses addition of new nucleotides

Question 14

RNA primase

Answer 14

adds small complementary RNA primer

Question 15

DNA polymerase II

Answer 15

excise incorrect base

Question 16

SSBP (single strand DNA binding protein)

Answer 16

stabilize single strand regions of DNA as it unwinds

Question 17

DNA ligase

Answer 17

joins ends of Okazaki fragments in lagging strand

Question 18

leading

Answer 18

DNA polymerase III builds continuous process towards replication fork (towards center of Y)

Question 19

lagging

Answer 19

DNA polymerase III adds nucleotide away from replicationo fork but they jumps over fragments to build none as replication bubble opens