Biology

AQA-7402-1-BIOLOGY FINAL MARK SCHEME PAPER 1-A LEVEL-Jun24.GRADED A. Question Marking Guidance Mark Comments 01.1 1. Circle(s)/shape(s) drawn around H in one of the HO groups of the glycerol and the OH group of the fatty acid; 2. Ester (bond); 3. Condensation (reaction); 3 (3 x AO1) 1. Accept circle(s)/shape(s) drawn around the OH group of one molecule and the H of an OH group of the other molecule Question Marking Guidance Mark Comments 01.2 Stearic (aci...

AQA-7402-3-QP-BIOLOGY QUESTION PAPER 3-A LEVEL-19Jun24. A-level BIOLOGY Paper 3 0 1 . 1 In the following passage, each numbered space can be filled with a biological term. Each type of cell has specific molecules on its (1) that identify it. An antibody is a (2) with two (3) binding sites. Antibodies are made and released by (4) cells. Vaccines can provide protection for individuals and populations against disease. The response to a vaccine is an example of (5) immunity. (6) immunity ...

AQA-7402-2-BIOLGY QUESTION PAPER 2-A LEVEL-14Jun24. 0 1 box 2 Following the release of acetylcholine into a neuromuscular junction, a muscle contraction occurs. Describe the sequence of events, following the release of acetylcholine, that leads to stimulation of this contraction. Do not include in your answer the events following the release of calcium ions in the myofibril.

AQA-7402-1-BIOLOGY QUESTION PAPER 1-A LEVEL-5Jun24.GRADED A. Answer all questions in the spaces provided. box 0 1 . 1 Figure 1 shows the structure of a fatty acid molecule and the structure of a glycerol molecule. Figure 1 On Figure 1, draw a circle around the part of the fatty acid molecule and the part of the glycerol molecule that is removed to form a bond in a triglyceride molecule. Name the bond formed between a fatty acid and glycerol in a triglyceride molecule. Name the reaction...

AQA-7401-2-Final MARK SCHEME BIOLOGY PAPER 2-AS LEVEL-MS-Jun24-v1.0.GRADED A Question Marking Guidance Mark Comments 01.1 1. Buffers changes in temperature; 2. (Provides a) cooling effect (via evaporation); 2 (2 x AO1) 1. Accept descriptions of buffering changes in temperature, eg resists temperature changes Question Marking Guidance Mark Comments 01.2 1. Evaporation/transpiration (from the porous pot); 2. Tension created moves water (upwards); 3. Cohesion mainta...

AS BIOLOGY 7401/1 Paper 1 Mark scheme June 2024 Question Marking Guidance Mark Comments 01.1 1. (A) Trachea; 2. (B) External intercostal (muscle); 2 (2 x AO1) 1. Accept cartilage Question Marking Guidance Mark Comments 01.2 3 correct = 2 marks;; 2 correct = 1 mark; 1 correct = 0 marks Box Statement F represents the diffusion of oxygen D represents the transport of a gas mixture C represents blood moving at the highest

AS BIOLOGY Paper 2 0 1 . 1 Water has a high heat capacity and a large latent heat of vaporisation. Describe the importance of each of these properties to living organisms. [2 marks] High heat capacity Large latent heat of vaporisation 0 1 . 2 Figure 1 shows that water loss from a porous pot can cause the upward movement of water. Figure 1 000002 Page 2 of 28 all the best 3 *03* Turn over ► IB/M/Jun24/7401/2 Do not write outside the Biologists have concluded that the...

AS BIOLOGY Paper 1 Answer all questions in the spaces provided. box 0 1 . 1 Figure 1 shows a diagram of the human gas exchange system. Figure 1 Structure B is muscle. The volume of the thorax is increased when structure B contracts. Name the structures labelled A and B

Cell The unit of Life Cell membrane Cell wall Prokaryotes vs Eukaryotes Endomembrane system.......

Biology