Biology Revision

4. fusing of a male gamete with a female gamete
5. a cell in the retina that detects different colours of light
7. Part of the brain that controls balance, posture and fine muscle movements
12. different versions of the same gene
13. A substance that contains genetic information
14. change in a factor that is detected by receptors
16. a small area of undifferentiated cells in a plant, such as near the shoot tips and root tips
19. a single strand of RNA produced in transcription
20. The movement of particles across a cell membrane from a region of lower concentration to a region of higher concentration
21. allele that will always affect the phenotype
22. Large bundle of neurones (and blood vessels)

1. A bright blue chemical reagent that turns orange or red when warmed with a solution of reducing sugars
2. the process of cells dividing to produce two daughter cells that are genetically identical to the parent
3. Uncontrolled cell division
6. Liquid found in the permanent vacuole in a plant cell
8. A substance that can speed up some processes in living things
9. insulating covering around the axons of many neurones
10. Describes a cell that has two sets of chromosomes
11. the process by which the genetic code in one strand of DNA molecules is used to make mrna
15. a scan in which a radioactive marker is uses to pinpoint certain areas in the body, such as very active cells
17. a set of three cases found in DNA and RNA.
18. lump formed of cancer cells