Biology Crossword

3. a plant growth regulator (plant hormone) that stimulates cell elongation
7. 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
11. 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
12. a lipid whose molecules are made up of a glycerol molecule and three fatty acids
13. a nitrogenous excretory product produced in the liver from the deamination of amino acids
14. a device that uses a biological material such as an enzyme to measure the concentration of a chemical compound
15. in the environment in which it is found
16. a green pigment responsible for light capture in photosynthesis in algae and plants
17. the probability of an organism surviving and
18. a haploid cell specialised for fertilisation

1. protection against infectious diseases, gained either actively or passively
2. having two identical alleles of a gene
3. a hormone secreted by the adrenal glands in times of stress or excitemen
4. enzymatic release of energy from organic compounds in living cells
5. tissue containing sieve tubes and other types of cell, responsible for the translocation of assimilates such as sucrose through a plant
6. the variety of ecosystems and species in an area and the genetic diversity within species
8. an illness in which the pancreas does not make sufficient insulin, or where cells do not respond appropriately to insulin
9. damage to the brain caused by bursting or blockage of an artery
10. a length of DNA that codes for a particular protein or polypeptide
19. nitrogen-containing purine base found in DNA and RNA