aqa AS BIOLOGY Paper 1 (7401/1) May 2023 Question Paper.
aqa AS BIOLOGY Paper 1 (7401/1) May 2023 Question Paper. 1. Describe the primary structure of all proteins. 2. This question is about the genetic code. Define universal, non-overlapping and degenerate. 3. Describe how the appearance of the area containing DNA in a TEM image of a eukaryotic cell would differ from that shown in Figure 1. 4. Describe one difference between the structure of DNA in a prokaryotic cell and in a eukaryotic cell. 5. Streptococcus bacteria can infect the lungs when air is breathed in and cause lung disease. Describe the mechanism of breathing that causes air to enter the lungs. 6. Some strains of Streptococcus bacteria are more likely to cause lung disease than other strains. Strains that do not cause lung disease are quickly destroyed by phagocytes. Phagocytes are stimulated when they bind to murein on Streptococcus bacteria. Each strain of Streptococcus bacteria has a capsule of different thickness from the others. Suggest how Streptococcus bacteria with a thicker capsule are more likely to survive and so cause lung disease.
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