Definitions

7. changing the genetic material of an organism by removing,changing or inserting individual genes
10. a network of interconnected food chains
14. a group of cells with similar structures, working together to perform a shared function
15. a unit containing the community of organisms and their environment, interacting together
16. any substance taken into the body that modifies or affects chemical reactions in the body
18. a group of organisms that can reproduce to produce fertile offspring
20. something present in the environment in such short supply that it restricts life processes
22. as the ability to detect or
23. a junction between two neurones
24. the movement of small food molecules and ions through the wall of the intestine into the blood

1. defence against a pathogen by antibody production in the body
2. the movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration using energy from respiration
3. having two different alleles of a particular gene
4. as a change in the base sequence of DNA
5. a thread-like structure of DNA, carrying genetic information
6. the removal of the nitrogen-containing part of amino acids to form urea
8. a length of DNA that codes for a protein
9. a permanent increase in size and dry mass by an increase in cell number or cell size or both
11. a chemical substance, produced by a gland and carried by the blood, which alters the activity of one or more specific target organs
12. a version of a gene
13. a group of organisms of one species, living in the same area, at the same time
17. the maintenance of a constant internal environment
19. stimuli in the internal or external environment and to make appropriate responses
21. the probability of an organism surviving and reproducing in the environment in which it is found