Biology 9700/13 Oct Nov 2015 | Cambridge AS Level Past Papers With Mark Scheme

1. Ribosome sizes in organelles like chloroplasts; correct measurement units for biological specimens including nanometers and micrometers.

2. Features of cilia and root hairs in cell surface area increase; roles of structures like rough ER and Golgi apparatus in synthesizing proteins, glycoproteins, and steroids.

3. Prokaryotic cell characteristics including cell wall composition and ribosome sizes; detection of biological molecules through Benedict’s, iodine, and biuret tests.

4. Bond formation in biological macromolecules; structure and characteristics of triglycerides and protein levels resistant to urea treatment.

5. Mutation effects on hemoglobin in sickle cell anemia; differences in enzyme activity due to substrate concentration, pH, and temperature changes.

6. Fluid mosaic model of membranes; active and passive transport processes including endocytosis and osmosis.

7. Diffusion experiments with selectively permeable membranes; stages of mitosis visible under microscopy.

8. Effects of transpiration on leaf mass; roles of active transport, mass flow, and osmosis in sucrose transport in plants.

9. Processes in the cardiac cycle; binding effects of 2,3BPG on hemoglobin affinity for oxygen.

10. Natural active immunity stimulation by pathogens; energy flow in food chains and nitrogen fixation activity by bacteria in ecosystems.