B5 Revision Crossword

3. Acids The small molecules that are joined in long chains to make protiens. All the protiens in living things are made from 20 _____/_____ joined in different orders.
4. A protien that catalyses chemical reactions in living things.
5. a new cell or individual. a _____ has the same genes as the parents
9. Cell division that halves the number of chromosomes to produce gametes. The four new cells are genetically different from each other and from the parent cell.
11. An organelle in animal and plant cells where respiration takes place.
12. Part of a plant or animal made up of different tissues.
13. cells Un specialised cells in plamts that can develop into any kind of specialised cell.
15. Helix The shape of a DNA molecule, with two strands twisted together in a spiral.
16. Group of specialised cells of the type working together to do a particular job.

1. The bending of growing plant shoots towards the light.
2. this is how an animal or organism matures. As a zygote developes, it forms more and more cells. These are organised into different tissues and organs.
6. Plant tissue transports water through a plant .
7. A plant hormone that affes=cts plant growth and development. For example, _____ stimulates growth of roots in cuttings.
8. A section of DNA giving the instructions for a cell about how to make one kind of protien.
10. Cloning Growing new tissues and organs from cloning embryonic stem cells. The new tissues and organs are used to treat people who are injured or ill.
14. A developing human embryo is referred to as a _____ once it reaches eight weeks after fertilization. A _____ already has all the main organs that it will have at birth.