molecular biology

Question 1

historical events
1. Friedrich Miescher
2. Richard Altman
3. Griffith
4. Sir George Beadle and Edward Tatum
5.1944 Avery
6.1952 Hershey and Chase
7.1953 Watson and Crick

Answer 1

1. identified DNA, which he
   called nuclein
   2.renamed nuclein as nucleic acid
   3.transforming principle
   4.explained the existence of a precise relationship between DNA and proteins
   5.the transforming material was
   pure DNA not protein
   6.used bacteriophage (virus) and E. coli to show that only viral DNA entered the host..
   7..discovered the structure of
   DNA was a double helix

Question 2

what are the 2 strains of streptococcus pneumoniae

Answer 2

smooth-covered with capsule,virulent
rough-not covered with capsule,non- virulent

Question 3

Bacteriophages have two alternative life cycles

Answer 3

lytic cycle
lysogenic cycle

Question 4

what are nucleosides

Answer 4

consists of a bases covalently
bonded to the 1’ position of a pentose sugar
molecule

Question 5

what are nucleotides

Answer 5

Nucleotides are nucleosides with one or more
phosphate groups covalently bound to the 5’
position of the sugar molecule.