Class XII

Genetic material sometimes needs to leave the nucleus of the cell. This can be accomplished by using ________ to take messages to the outside of the nucleus.
  1. DNA
  2. CNA
  3. RNA
  4. none of the above
The three parts of a nucleotide are called: phosphate, nitrogen base and a ____________.
  1. sugar
  2. hydrogen
  3. potassium
  4. nickel
The shape of the double helix looks like a
  1. razor blade
  2. twisted ladder
  3. round balloon
  4. triangle
The two nucleic acids that play crucial roles in the synthesis of proteins:
  1. A. ribonucleic acid- RNA
  2. B. deoxyribonucleic acid
  3. both A & B
  4. neither A nor B
According to the nitrogen base pair ruling adenine (A) will only make a bond with ____________.
  1. urasil (U)
  2. guanine (G)
  3. thymine
  4. cytosine (C)
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