Question

7.3 vocabulary and concept review - i
drag the words into the correct boxes

1. is the enzyme that maintains the supercoiling of dna
2. the enzyme that unzips the dna to prepare it for replication by breaking the hydrogen bonds between the nucleotide bases is
3. a single dna strand that, during dna replication, is replicated in the same direction as the replication fork is the
4. are short sequences of dna nucleotides (approximately 150 to 200 base pairs long in eukaryotes) which are synthesized discontinuously and later linked together by the enzyme dna ligase during dna replication
5. the is the area where the two strands of dna are exposed once the double helix is opened
6. refers to the orientation of nucleotides of a single strand of dna or rna and the direction in which nucleotides are added during replication
7. is the enzyme which adds complimentary nucleotides in the 5-3 direction during replication
8. the is one of two strands of dna found at the replication fork, in the double helix which requires a slight delay before undergoing replication, and it must undergo replication discontinuously in small fragments

okazaki fragments
5-3
helicase
dna gyrase
dna polymerase iii
lagging strand
replication fork
leading strand

Explanation:

1. DNA gyrase maintains DNA supercoiling.
2. Helicase unzips DNA by breaking hydrogen - bonds.
3. Leading strand is replicated in the same direction as the replication fork.
4. Okazaki fragments are short, discontinuously synthesized DNA sequences.
5. Replication fork is where DNA strands are exposed.
6. 5'-3' refers to nucleotide orientation and addition direction.
7. DNA polymerase III adds complementary nucleotides in 5'-3' direction.
8. Lagging strand has a delay and replicates discontinuously.

Answer:

1. DNA gyrase
2. helicase
3. leading strand
4. Okazaki fragments
5. replication fork
6. 5'-3'
7. DNA polymerase III
8. lagging strand