Biology As Level, Ocr Study Guide Rated A+

Amylose and amylopectin. {Ans: What are the names of the two polysaccharides that make up starch?}Bend, which means that they cannot pack as closely together, making them liquid at room temperature instead of solid. {Ans: The presence of double bonds in fatty acids causes them to do what?}All living organisms are composed of cells, and since most cells are too small to see without a microscope, we cannot observe the functions of cells and their organelles without one. {Ans: Outline the importance of microscopes in the study of living organisms.}Approximately 90 days. {Ans: How long is the life span of an erythrocyte?} {Ans: Phospholipid?}The shortest distance between two objects that can still be seen as separate entities. {Ans: Define the term 'resolution'.}Light = 200nm Electron = TEM: 0.5nm and SEM: 3-10nm {Ans: Relative resolving power of light and electron microscopes?}The first one. {Ans: Which division in mitosis is classed as the reduction division?}Polarity. {Ans: Which property of water enables it to be a good solvent?}1. Grind sample in mortar and pestle to break down the cell walls. 2. Mix sample with detergent to break down the cell membrane. 3. Add salt