DNA As The Genetic Material

Question 1

Why were Proteins favorited to be the genetic material

Answer 1

1. Proteins were composed of different building blocks — amino acids
   2, dna was composed of only 4 building blocks - nucleotides
2. Proteins could assume very complex structures therefore more likely to be able to provide the genetic variation

Question 2

Who is Frederick Griffith

Answer 2

Doctor who was studying bacterium that caused pneumonia in mammals - streptococcus pneumoniae

Question 3

What bacteria strains did Griffith use

Answer 3

• s bacteria from the patients who died

- r bacteria from the paste it’s who didn’t die

Question 4

What happened to the s bacteria

Answer 4

Formed smooth colonies in agar plates -> bacteria had a capsule that prevented them from being identified

Question 5

What happens to r bacteria in Griffith experiment

Answer 5

R bacteria formed rough colonies in agar plate -> bacteria did not have a capsule hence they could be recognized by the immune system

Question 6

Griffith discovered what by accident

Answer 6

Bacterial transformation

Question 7

Griffith conclusions

Answer 7

S-heat-killed bacteria, the r-bacteria were able to make smooth capsules, become pathogenic and kill the mice
-material from the dead s bacteria was passed to the e bacteria to make them pathogenic