2023 AQA AS BIOLOGY 7401/1 Paper 1 Question Paper & Mark scheme with 100%verified solution

2023 AQA AS BIOLOGY 7401/1 Paper 1 Question Paper & Mark scheme with 100%verified solution Contrast the structures of ATP and a nucleotide found in DNA to give two differences. - answers - 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. - answers diffusion Explain the advantages of lipid droplet and micelle formation. - answers - 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. - answers - modifies triglycerides - combines triglycerides with proteins - packaged for exocytosis Explain the role of the heart in the formation of tissue fluid. - answers - 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. - answers excess tissue fluid cannot be reabsorbed Which test could scientists use to identify that there are amino acids in white wine? - answers Biuret Name the chemical element found in all amino acids that is not found in triglycerides. - answers nitrogen Explain how the chromosome number is halved during meiosis. - answers - there's homologous chromosomes - one of each pair goes to each daughter cell Describe the process of crossing over and explain how it increases genetic diversity. - answers - homologous pairs of chromosomes form a bivalent - chiasma is formed - equal lengths of non-sister chromatids are exchanged - this produces new combinations of alleles