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BIOLOGY AQA AS LEVEL 7401 1 PAPER 1 TEST WITH ALL SOLUTIONS
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BIOLOGY AQA AS LEVEL 7401 1 PAPER 1 TEST WITH ALL SOLUTIONS
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BIOLOGY AQA AS LEVEL 7401/1PAPER 1 TEST WITH ALL SOLUTIONS
• The human cell then makes a complementary strand to the HIV DNA.
The complementary strand is made in the same way as a new complementary
strand is made during semi-conservative replication of human DNA. Describe how
the complementary strand of HIV DNA is made. - correct answer-- there are
complementary nucleotides/bases pair
- DNA polymerase used
- Nucleotides join together (to form new strand)/phosphodiester bonds form;
Contrast the structures of DNA and mRNA molecules to give three differences. -
correct answer-- DNA is double stranded/double helix and mRNA single-stranded;
- DNA (very) long and RNA short;
-Thymine/T in DNA and uracil/U in RNA;
- Deoxyribose in DNA and ribose in RNA;
Describe the difference between the structure of a triglyceride molecule and the -
correct answer-In phospholipid, one fatty acid replaced by a phosphate
Describe how you would test for the presence of a lipid in a sample of food - correct
answer-- Add ethanol, then add water;
-White (emulsion shows lipid)
Describe how a saturated fatty acid is different from an unsaturated fatty acid -
correct answer-Unsaturated has (at least one) double bond (between carbons)
This fat substitute cannot be digested in the gut by lipase. Suggest why. - correct
answer-- (Fat substitute) is a different/wrong shape/not complementary
- Unable to fit/bind to (active site of) lipase/no ES complex formed;
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