Chapter 14: DNA and RNA revision worksheet
1. Define the following:
(i)
Heredity:
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(ii)
Gene:
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(iii)
Gene expression:
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2. What two substances make up a chromosome?
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3. Distinguish between coding and non-coding regions of a chromosome:
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4. What does DNA stand for? ____________________________________
5. Name the three components of a nucleotide.
(i)
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(ii)
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(iii)
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6. Which part of the nucleotide varies? _____________________
7. Name the four possibilities of this part of the nucleotide in DNA.
(i)
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(ii)
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(iii)
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(iv)
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8. In the space below, draw the structure of DNA showing 3 pairs of nucleotides in DNA with
the following sequence on one strand: ATC
9. Explain what you understand by ‘complementary base-pairing’:
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10. Briefly describe the process involved in DNA replication:
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11. What is DNA profiling?
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12. Briefly describe the four distinct stages in DNA profiling:
(i)
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(ii)
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(iii)
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(iv)
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13. What is genetic screening?
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14. Explain the ethical problems associated with genetic screening:
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15. Answer the following questions with regard to the experiment you carried out to isolate
DNA from plant tissue:
(i)
Name the plant that you used: _______________________
(ii)
Explain the importance of salt in this experiment:
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(iii)
Explain the importance of washing up liquid in the experiment:
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(iv)
Explain the importance of the heating step:
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(v)
How did you separate the DNA mixture from the other remnants of the plant cells
(e.g. plant cell wall):
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(vi)
How did you remove the protein from the DNA?
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(vii)
Why was ice-cold ethanol used rather than ethanol at room temperature?
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16. What does RNA stand for? ________________________________________
17. Give two structural differences between DNA and RNA:
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