Unit 3- Molecular Genetics

Question 0

Okazaki fragments

Answer 0

The new piece of DNA on the lagging strands

Question 1

Chargaff rule

Answer 1

If you know the nucleotide sequence of one strand you can uncover the sequence of the other strands

Question 2

Chromosomes

Answer 2

A threadlike strand of DNA in the cell nucleus that carries the genes in a linear order

Question 3

Locus

Answer 3

Specific location on a gene

Question 4

Gene

Answer 4

A distinct sequence of nucleotides forming part of a chromosome

Question 5

DNA molecule

Answer 5

Pentose sugar
Phosphate group
Nitrogenous base

Question 6

How is the nitrogenous base attached to the carbon ring?

Answer 6

Glycosyl bond

Question 7

How is the phosphate group attached to the 5’ carbon?

Answer 7

Ester bond

Question 8

Complementary base pairing

Answer 8

Purines are always bonded to a pyrimidine

Question 9

Meselson and Stahl model 1

Answer 9

The original parent DNA is conserved and not altered in any way. The daughter DNA molecule will be made entirely from free floating nucleotides in the nucleus

Question 10

Meselson and Stahl’s model 2

Answer 10

Half the parent DNA will be used in the construction of the new DNA molecule. This half is conserved (semi conserved). Thus it is half parent cell and half free floating nucleotide

Question 11

M and S experiment

Answer 11

Step1 grow E. coli bacteria in the presence of N15 only (parent)
Step2 take those bacteria and allow them to reproduce in the presence of N14 (gen 1)
Step3 take gen 1 bacteria and again allow them to reproduce in N14 (gen 2)

Question 12

M and S conclusion

Answer 12

The DNA that contains N15 are heavier