Aqa Gcse Biology Study Guide Rated A+

Whats the most common optimum pH {Ans: its often pH 7- neutral but not always}What is the process by which cells become specialised? {Ans: differentiation}How many amino acids are used? {Ans: 20, but they make up thousands of different proteins}What does mitosis create new cells for? {Ans: grow or to replace cells that have been damaged}What is meant by phenotype? {Ans: physical appearance of the characteristic, e.g. dimples or no dimples}How do you work out the population size? {Ans: mean number of organisms per m² x total area (in m²) of the habitat}