Nucleotides and nucleic acids

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  • Created by: Georgia56
  • Created on: 12-04-17 11:20

1. Which one of the following is NOT a common feature of a nucleotide?

  • A nucleotide consists of a phosphate group, a 5 or 6- carbon sugar and an organic base.
  • The sugar molecule is a 5-carbon sugar, either deoxyribose (in DNA) or ribose (in RNA)
  • There are 5 possible bases: adenine, thymine, guanine, cytosine and uracil.
  • The phosphate groups of all nucleic acids are always the same.
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Other questions in this quiz

2. 17 How many polynucleotide strands are found in a tRNA molecule?

  • 4
  • 2
  • 1
  • 3

3. 7 Which of the following options, A – D, are the pyrimidine bases found in DNA?

  • thymine and cytosine
  • uracil and thymine
  • adenine and thymine
  • cytosine and uracil

4. RNA is structurally different from DNA in a number of important ways. Which one of these ways is INCORRECT?

  • The nitrogenous base uracil is found instead of the organic base thymine
  • 3 forms of RNA molecule exists
  • The polynucleotide is never single stranded
  • The sugar molecule that makes up the nucleotides is ribose.

5. 1 Which of the following bonds are broken during DNA replication?

  • ionic bonds between bases and phosphate groups
  • hydrogen bonds between bases
  • covalent bonds between bases
  • phosphodiester bonds
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