IGCSE BIOLOGY

6. what is the substance that increases the rate of a chemical reaction and is not changed by the reaction
7. what is the net movement of water molecules from a region of higher water potential to a region of lower region of water potential through a partially permeable membrane
9. ........... digestion is the breaking down of food into smaller pieces without chemical change to the food molecules
11. Most mature plant cells have a large, fluid-filled space called a
12. what is the sub units of carbohydrate
13. amino acids are made by combining ..........with sugar molecules
14. what is a group of organisms that can reproduce to produce fertile offspring

1. ........microscope has two convex lenses
2. what are present in the membrane system, in the mitochondria in special vacuoles and in the fluid part of the cytoplasm
3. What is used to identify unfamiliar organisms
4. what is the enzyme that breaks down starch into sugar
5. what is the net movement of molecules and ions from a region of their higher region of their lower concentration down a concentration gradient
8. some proteins also need ....... molecules and these are absorbed from the soil in the form of sulfates
10. A .......... diet must contain enough carbohydrates and fats to meet our energy needs