Meleson and Stahl

Question 1

what were they trying to prove in this experiment

Answer 1

that dna is replicated semi conservatively

Question 2

what did their experiemnt use.
what of

Answer 2

isotopes of nitrogen

Question 3

what was the light nitrogen

Answer 3

14
N

Question 4

what was the heavy nitrogen

Answer 4

15
N

Question 5

what is an isotope

Answer 5

same number of protons and electrons but different number of neutrons

Question 6

what are both spun in

Answer 6

a centrifuge

Question 7

how many generations were there

Answer 7

4

Question 8

what bacteria was grown in the medium containing 15N (g0)

Answer 8

100% of dna was 15N 15N

Question 9

what bacteria was grown in the medium containing 14N (g1)

Answer 9

100% of dna was 15N 14N

Question 10

what bacteria was grown in the medium containing 14N (g2)

Answer 10

50% of dna was 14N 14N
50% of dna was 15N 14N

Question 11

what bacteria was grown in the medium containing 14N

Answer 11

75% of dna was 14N 14N
25% of dna was 15N 14N

Question 12

how do these reults prove dna is replicted using the semi conservatve method

Answer 12

because they found that dna was found only in the middle of the test tube after centrifugation.