DNA Structure And Function (Chapter 14)

Question 1

DNA Structure

Answer 1

A Nucleic acid composed of nucleotides
-5 carbon sugar called deoxyribose
-Phosphate group attached to 5’ carbon of sugar
-Nitrogenous base attached 1’ carbon

Question 2

What bonds are formed between nucleotides?

Answer 2

Phosphodiester Bonds

Question 3

The Double Helix is….

Answer 3

-2 strands are polymers of nucleotides with a phosphate-ribose backbone

Question 4

What bonds for with T and C?

Answer 4

-A forms 2 H-bonds with T
-G forms 3 H-bonds with C

Question 5

What are the three possible models of DNA Replication?

Answer 5

-Semiconservative, Conservative, Dispersive

Question 6

What phase does DNA Replication occur in?

Answer 6

S phase

Question 7

How does Prokaryotic DNA Replication occur?

Answer 7

-Prokaryotes have a single circular chromosome
-It begins at the origin of replication site, and proceeds in both directions around the chromosome

Question 8

Enzymes and other proteins involved in Prokaryotic Replication

Answer 8

Helicase, Topoisomerase, Single-strand-binding proteins, DNA primate, DNA Polymerase I,II,III

Question 9

What are Telomeres?

Answer 9

-Telomeres are specialized structures found at the ends of eukaryotic chromosomes.

Question 10

What is Photorepair?

Answer 10

Is a specific repair mechanism
-Photolyase utilizes energy from the visible range of light to correct thymine dimers. (An example)