South Africa Matric · Life Sciences

DNA, RNA and protein synthesis

15 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 15 questions

  1. Which three components make up one nucleotide of DNA?
  2. In a DNA molecule, adenine pairs with
  3. A DNA template strand has the base sequence TAC GGA. What is the base sequence of the mRNA transcribed from it?
  4. How many nucleotides make up one codon on mRNA?
  5. In which part of a eukaryotic cell does transcription take place?
  6. Translation of mRNA into a polypeptide takes place at the
  7. What is the role of tRNA in protein synthesis?
  8. Which type of RNA carries the genetic code from the nucleus to the ribosome?
  9. A DNA molecule contains 20% adenine. What percentage of the bases is cytosine?
  10. A mutation changes one base in a gene but the polypeptide is unchanged. This is possible because
  11. DNA replication is described as semi-conservative because
  12. A gene is best described as
  13. How many chromosomes are found in a normal human body cell and in a human sperm cell respectively?
  14. Which molecule has the shape of a double helix?
  15. In which stage of the cell cycle does DNA replication take place?

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