unit 3

Question 1

DNA

Answer 1

stores genetic info

Question 2

dna shape

Answer 2

double helix (anti parallel) 
- 2 strands run parallel to eachother but w opposite alignments

Question 3

DNA is made up of:

Answer 3

1. nitrogenous bases
2. phosphate (deoxyribose)
3. sugar (5c)

Question 4

4 types of nitrogenous bases:

Answer 4

adenine
thymine
guanine
cytosine

Question 5

things move and build from

Answer 5

move 3-5

build 5-3

Question 6

enzyme, dna ligase

Answer 6

linking enzyme joins strands (2 okazaki) joined w molecular and covalent bonding

Question 7

leaving strand:

Answer 7

• template strand of dna
• continuous addition of nitrogenous bases
• 5-3 direction and mcgraw hill replication fork

Question 8

lagging strand:

Answer 8

other dna strand

- dorms shirt strands of okazaki fragments that later join 5-3

Question 9

DNA polymerase 1

Answer 9

cuts off RNA primers and fills in w DNA between lagging strands
- can proof read gaps in lagging strand

Question 10

DNA polymerase 111

Answer 10

• elongated strand by adding nucleioids on leading strand

- also proof reads and corrects DNA strand

Question 11

single strand binding proteins:

Answer 11

stabilize DNA strands ad they are replicating

-prevents rejoining of DNA strands