Biology Paper 1 AQA

4. The exothermic reaction that transfers energy from glucose to ATP in cells.
5. A random change in the DNA base sequence of a gene.
7. The process by which a cell changes to become specialised for its role.
9. The observable characteristics of an organism resulting from its genotype and environment.
10. An alternative form of a gene found at the same locus on homologous chromosomes.
11. A control mechanism that involves reversing a change to maintain internal balance.
15. The net movement of water molecules across a partially permeable membrane from high to low water potential.
16. The genetic makeup of an organism in terms of the alleles it possesses.
17. The endothermic reaction in which light energy is transferred to chemical energy in glucose.
18. The process by which cells develop specific structures to carry out particular functions.
20. membrane The selectively permeable boundary of a cell that controls the movement of substances in and out.

1. The regulation of internal conditions to maintain a stable optimum environment.
2. When an enzyme changes shape and its active site no longer fits the substrate due to extreme pH or temperature.
3. The difference in concentration between two areas.
6. A protein that acts as a biological catalyst by lowering activation energy.
8. The amount of a substance in a given volume of solution.
12. A type of cell that contains a nucleus and membrane-bound organelles.
13. A type of cell that lacks a nucleus and has genetic material free in the cytoplasm.
14. A type of cell division producing two genetically identical diploid daughter cells.
19. The movement of substances against their concentration gradient using energy from ATP.