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BIOLOGY AQA AS LEVEL 7401 1 PAPER 1 EXAM WITH CORRECT ANSWERS UPDATED.
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BIOLOGY AQA AS LEVEL 7401 1 PAPER 1 EXAM WITH CORRECT ANSWERS UPDATED.
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BIOLOGY AQA AS LEVEL 7401/1PAPER 1 EXAM WITH CORRECT
ANSWERS UPDATED
• The human cell then makes a complementary strand to the HIV DNA.
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The complementary strand is made in the same way as a new complementary
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strand is made during semi-conservative replication of human DNA. Describe how
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nthe complementary strand of HIV DNA is made. - correct answer-- there are
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ncomplementary nucleotides/bases pair n n
- DNA polymerase used
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- Nucleotides join together (to form new strand)/phosphodiester bonds form;
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Contrast the structures of DNA and mRNA molecules to give three differences. -
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ncorrect answer-- DNA is double stranded/double helix and mRNA single-stranded;
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- DNA (very) long and RNA short;
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-Thymine/T in DNA and uracil/U in RNA;
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- Deoxyribose in DNA and ribose in RNA;
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Describe the difference between the structure of a triglyceride molecule and the -
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correct answer-In phospholipid, one fatty acid replaced by a phosphate
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Describe how you would test for the presence of a lipid in a sample of food - correct
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nanswer-- Add ethanol, then add water;
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-White (emulsion shows lipid)
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Describe how a saturated fatty acid is different from an unsaturated fatty acid -
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correct answer-Unsaturated has (at least one) double bond (between carbons)
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