Edexcel Biology Topic 6 Quiz

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1. Why is the enzyme DNA Polymerase used in PCR?

  • It is the only enzyme which will join to a DNA primer, which is essential for PCR.
  • Because it is able to withstand the temperature that is needed to break the hydrogen bonds to separate the DNA strands when PCR is repeated.
  • Because it is an enzyme that works quickly.
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2. When someone dies, their core body temperature starts to fall until it reaches what temperature?

  • The earth temperature.
  • Ambient temperature.
  • The environmental temperature.

3. At what temperature is DNA heated in PCR so that the hydrogen bonds break and the DNA is seperated into two strands?

  • 95 degrees celsius.
  • 55 degrees celsius.
  • 70 degrees celsius.

4. There is a time period when using body temperature to predict time of death can be used, what is this time period?

  • 36 hours.
  • 24 hours.
  • 48 hours
  • 18 hours.

5. In Southern Blotting, a DNA probe binds to a complementary target DNA sequence to make this target sequence visible, when the complementary probe joins to the target DNA sequence it is said to have what?

  • Hybridised.
  • Phosphophorylated.
  • Hydrogenated.
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