MOLECULAR GENETICS

Structure of DNA discovered in year
1. 1957
2. 1958
3. 1962
The elementary structure unit of polynucleotide chain are
1. nucleotides
2. nucleoids
3. nucleosomes
Pentose contains
1. 5 carbon atoms
2. 6 carbon atoms
3. 10 carbon atoms
Which ones belong among purine bases?
1. adenine and guanine
2. thymine and cytosine
3. guanine and thymine
Polynucleotide chains are connected by ............................. between bases
1. hydrogen bridges
2. phosphate bridges
3. peptide bridges
Complementarity of bases means
1. A connected with T by two hydrogen bonds (bridges)
  C connected with G by three hydrogen bonds
2. A connected with T by three hydrogen bonds (bridges)
  C connected with G by two hydrogen bonds
3. C connected with T by two hydrogen bonds
  A connected with G by three hydrogen bonds (bridges)
Denaturation of DNA proceeds by
1. high temperature 90 – 100°C
2. chilling down
DNA molecules in nuclei of eukaryotic cells are
1. linear
2. circular
3. both linear and circular
In prokaryotic cells there are also small DNA molecules are called
1. plasmids
2. plastids
3. chloroplasts
Pyrimidine bases are
1. adenine and guanine
2. adenine and guanine
3. adenine and cytosine