Aqa A-Level Biology Paper 2 Study Guide Questions And Correct Answers

1. Chlorophyll absorbs light which excites electrons 2. And causes them to be lost {Ans: Describe what happens during photoionisation in the LDR. (2)}1. Have an irregular shape 2. Contain a darker and larger nucleus 3. Do not produce the correct proteins 4. Have different antigens on their surface 5. Divide by mitosis more frequently than normal cells {Ans: Describe how tumour cells look and function differently to healthy cells. (5)}1. Found in the first few divisions of a fertilised egg 2. Can differentiate into any cell {Ans: Totipotent Stem cells (2) [Where][Power]}1. High visual sensitivity 2. Can detect light in low light intensity as many rod cells are connected to a single bipolar cell (spatial summation) 3. Low visual acuity (quality of vision) 4. Rhodopsin {Ans: Rod Characteristics (The Where)}1. Add a healthy dominant allele which will insert into the person's original DNA. {Ans: Suggest how Gene therapy is used to treat a disorder caused by two mutated recessive alleles. (1)}The niche species could potentially occupy. {Ans: Fundamental Niche}Nitrogen fixing bacteria found in soil or in leguminous plants convert N2(g) —> NH4+ (in soil) {Ans: Nitrogen Fixation (1)}1. Detected by baroreceptors in