Biology Crossword

5. a plant growth regulator (plant hormone) that stimulates cell elongation
6. an illness in which the pancreas does not make sufficient insulin, or where cells do not respond appropriately to insulin
9. a lipid whose molecules are made up of a glycerol molecule and three fatty acids
12. damage to the brain caused by bursting or blockage of an artery
13. a device that uses a biological material such as an enzyme to measure the concentration of a chemical compound
15. the net movement of molecules or ions from a region of higher concentration to a region of lower concentration down a gradient, as a result of the random movements of particles
17. having two identical alleles of a gene
19. a length of DNA that codes for a particular protein or polypeptide
20. the loss of water vapour from a plant to its environment, by diffusion down a water potential gradient; most transpiration takes place through the stomata in the leaves
21. a hormone secreted by the adrenal glands in times of stress or excitemen

1. a change in the environment that is detected by a receptor, and which may cause a response
2. a nitrogenous excretory product produced in the liver from the deamination of amino acids
3. a haploid cell specialised for fertilisation
4. nitrogen-containing purine base found in DNA and RNA
7. tissue containing sieve tubes and other types of cell, responsible for the translocation of assimilates such as sucrose through a plant
8. the probability of an organism surviving and reproducing in the environment in which it is found
10. enzymatic release of energy from organic compounds in living cells
11. protection against infectious diseases, gained either actively or passively
14. the variety of ecosystems and species in an area and the genetic diversity within species
16. a tube that carries urine from a kidney to the bladder
18. a green pigment responsible for light capture in photosynthesis in algae and plants