AQA AS Level Biology Paper 1 June 2018 latest update 2024 GRADED A+

AQA AS Level Biology Paper 1 June 2018 latest update 2024 GRADED A+ Name the blood vessels that carry blood to the heart muscle. [1 mark] - CORRECT ANSWER-coronary arteries What is a monomer? (1 mark) - CORRECT ANSWER-the smaller/ repeating unit from which larger molecules/polymers are made Following digestion and absorption of food, the undigested remains are processed to form faces in the parts of the intestine below the ileum. The faeces of people with constipation are dry and hard. constipation can be treated by drinking lactulose. Lactulose is soluble, but not digested or absorbed in the human intestine. Use your knowledge of water potential to suggest why lactulose can be used to help people suffering from constipation. (2 marks) - CORRECT ANSWER-(lactulose) lowers water potential in the faeces water enters due to osmosis and softens the faeces Give two features of DNA and explain how each one is important in the semi-conservative replication of DNA. (2 marks) - CORRECT ANSWER-Weak / easily broken hydrogen bonds between bases allow two strands to separate / unzip; Two strands, so both can act as templates; Complementary base pairing allows accurate replication; What is meant by a hierarchy? [2 marks] - CORRECT ANSWERsmaller groups within larger groups and no overlap Use Figure 6 D. erecta and D. willistoni are closely related species but different species. Describe evidence from Figure 6 that supports this statement. - CORRECT ANSWER-both sine song is very similar but pulse song have different peaks When two females were together, their songs did not lead to any attempt to mate. Use information from Figure 6 to suggest why the two females did not attempt to mate. Use information from Figure 6 to suggest why the two females did not attempt to mate. [2 marks] - CORRECT ANSWER-3 peaks in pulse song occur at the same time since both are female so normal male song to stimulate/ cause mating Name the blood vessels that carry blood to the heart muscle. [1 mark] - CORRECT ANSWER-coronary arteries What is a monomer? (1 mark) - CORRECT ANSWER-the smaller/ repeating unit from which larger molecules/polymers are made Following digestion and absorption of food, the undigested remains are processed to form faces in the parts of the intestine below the ileum. The faeces of people with constipation are dry and hard. constipation can be treated by drinking lactulose. Lactulose is soluble, but not digested or absorbed in the human intestine. Use your knowledge of water potential to suggest why lactulose can be used to help people suffering from constipation. (2 marks) - CORRECT ANSWER-(lactulose) lowers water potential in the faeces water enters due to osmosis and softens the faeces Give two features of DNA and explain how each one is important in the semi-conservative replication of DNA. (2 marks) - CORRECT ANSWER-Weak / easily broken hydrogen bonds between bases allow two strands to separate / unzip; Two strands, so both can act as templates; Complementary base pairing allows accurate replication; What is meant by a hierarchy? [2 marks] - CORRECT ANSWERsmaller groups within larger groups and no overlap Use Figure 6 D. erecta and D. willistoni are closely related species but different species. Describe evidence from Figure 6 that supports this statement. - CORRECT ANSWER-both sine song is very similar but pulse song have different peaks When two females were together, their songs did not lead to any attempt to mate. Use information from Figure 6 to suggest why the two females did not attempt to mate. Use information from Figure 6 to suggest why the two females did not attempt to mate. [2 marks] - CORRECT ANSWER-3 peaks in pulse song occur at the same time since both are female so normal male song to stimulate/ cause mating