14.3

Question 1

Compare eukaryotic DNA replication with prokaryotic DNA replication.

Answer 1

o Eukaryotic replication
 Multiple origins of replication
 Takes longer
o Prokaryotes
 One point of origin
 Circular chromosomes, no telomeres
 Faster
 Don’t have to package DNA

Question 2

Identify the function of telomeres.

Answer 2

protects the end of chromosomes from nucleases (don’t contain genes/ important info)
extends the ends of chromosomes

Question 3

Evaluate the role of telomerase in cell division.

Answer 3

o Postpone erosion of genes by extending the ends of chromosomal DNA molecules
o Only active in early development and germline cells. Also active in cancer cells

Question 4

different forms of DNA repair.

Answer 4

1. mismatch repair
2. photo repair
3. nucleotide excision repair

Question 5

Mismatch repair

Answer 5

Removes incorrect bases and replaces them with the correct base by copying the template strand ( during replication)

Question 6

Photorepair

Answer 6

Absorbs light in visible range, uses that energy to cleave thymine dimer

Question 7

Nucleotide excision repair

Answer 7

The damaged part is removed and replaced by DNA synthesis. Re-synthesis happens from using the undamaged strand as a template