functions of genetic material

Question 1

functions of genetic material

Answer 1

-replicate
- control growth and development
- adapt to changed in the environment

Question 2

Mice experiment: can an extract from dead bacterial cells genetically transform living cells?

Answer 2

4 methods
1) IIIS virulent bacteria
2) IIR nonvirulent bacteria
3) IIIS heat-killed bacteria
4) mixture of non virulent and heat-killed bacteria
conclusion: a substance in the heat-killed virulent bacteria genetically transformed the IIR bacteria into live, virulent IIIS bacteria

Question 3

Avery-Macleod-McCarty experiment: what is the chemical nature of the transforming substance?

Answer 3

1) use heat to kill virulent bacteria
2) treat samples with enzymes that destroy proteins, RNA or DNA
3) add the treated samples to cultures of type IIR bacteria
4) cultures treated with protease or RNase contain transformed type IIIS bacteria but culture treated with DNase does not
conclusion: since only DNase destroyed the transforming substance, the transforming substance is DNA

Question 4

TMV experiment: what substance, RNA or Protein, carries the genetic material in tobacco mosaic virus?

Answer 4

1) degrade both types of TMV to yield RNA and coat proteins
2) mix RNA of one type with protein of another type to create hybrid viruses
3) infect tobacco with virus
4) the type of RNA in the hybrid parent TMV determines the RNA and protein of the progeny virus
conclusion: RNA is the genetic material of TMV

Question 5

what stores genetic information

Answer 5

DNA in most living organism
RNA in some viruses