Biology 9700/02 Oct Nov 2004 | Cambridge AS Level Past Papers With Mark Scheme

1. Phloem structure and function: sieve tube elements facilitating translocation, companion cells' role in active transport, and sucrose as a primary assimilate.

2. Polysaccharide formation: β-glucose bonding in cellulose synthesis, glycosidic bond identification, and structure differences from α-glucose.

3. Nitrogen cycle in grasslands: conversion of ammonium ions to nitrate via nitrification, nitrate uptake inhibited by cyanide, and nitrate level reduction after replacing solution with water.

4. Bacterial structure: identification of capsule, cell wall, and nucleoid; TB transmission by droplets; multi-antibiotic treatment to counter resistance.

5. Enzyme activity: phosphatase reaction pH effects, competitive inhibitor mechanisms, and expected enzyme activity curve adjustments at lower temperatures.