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AQA AS BIOLOGY paper 1(7401_1) solutions .
AQA AS BIOLOGY paper 1(7401_1) solutions .
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AQA AS BIOLOGY paper 1(7401/1)solutions
Contrast the structures of ATP and a nucleotide found in DNA to give two differences. -
ANS-- ATP has ribose and DNA nucleotide has deoxyribose
- ATP has 3 phosphate groups and DNA nucleotide has 1 phosphate group
Name the process by which fatty acids and glycerol enter the intestinal epithelial cell. -
ANS-diffusion
Explain the advantages of lipid droplet and micelle formation. - ANS-- droplets increase
surface areas for lipase enzyme action
- so faster hydrolysis of triglycerides
- micelles carry fatty acids and glycerol through the membrane to intestinal epithelial
cell.
Suggest how the golgi apparatus is involved in the absorption of lipids. - ANS-- modifies
triglycerides
- combines triglycerides with proteins
- packaged for exocytosis
Explain the role of the heart in the formation of tissue fluid. - ANS-- contraction of
ventricles produces a high blood pressure
- this forces water out of the blood capillaries
Suggest how a blockage in the lymphatic system could cause lymphoedema. -
ANS-excess tissue fluid cannot be reabsorbed
Which test could scientists use to identify that there are amino acids in white wine? -
ANS-Biuret
Name the chemical element found in all amino acids that is not found in triglycerides. -
ANS-nitrogen
Explain how the chromosome number is halved during meiosis. - ANS-- there's
homologous chromosomes
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