14

Question 1

demonstrated bacterial transformation

Answer 1

Frederick Griffith

Question 2

DNA fragments were taken up by bacteria and changed their
phenotyp

Answer 2

Frederick Griffith

Question 3

worked with bacteriophages

Answer 3

Alfred Hershey and Martha Chase

Question 4

viruses ntroduced their DNA into the bacterial host, not their protein.
Isotopes were used to label the molecules

Answer 4

Alfred Hershey and Martha Chase

Question 4

analyzed nitrogenous bases by species

Answer 4

Erwin Chargaff’s

Question 5

Who found out that different species had different ratios of base pairs

Answer 5

Erwin Chargaff’s

Question 5

used X-ray crystallography to see the actual molecule

Answer 5

Maurice Wilkins and Rosalind Franklin

Question 6

Analyses of DNA composition lead
to what became known as

Answer 6

Chargaff’s Rules

Question 7

are credited with finally solving the puzzle as
to the actual structure of the molecule.

Answer 7

James Watson and Francis Crick

Question 8

Short segments of nucleotides are polymerized
in the 5’ to 3’ direction
– away from the fork

Answer 8

Okazaki fragments

Question 9

Okazaki fragments oare covalently bonded together by the enzyme

Answer 9

Dna Ligase

Question 10

Inserts the RNA primer
sequence

Answer 10

Primase

Question 11

lagging strand is made in short fragments called

Answer 11

Okasaki fragments

Question 12

Okazaki fragments are connected by

Answer 12

Ligase