biology unit 2 definitions Definitions from all of unit 2 in biology 5.0 / 5 based on 1 rating ? BiologyASAQA Created by: jessicaCreated on: 14-05-13 20:57 63285917 Across 1. A measure of the number of different species in a particular ecosystem (12) 2. An alternative form of a gene (6) 6. Single celled prokaryotic organism (8) 7. ne of four nitrogen-containing compounds that fit together (like jigsaw pieces) In DNA they are Adenine Thymine Cytosine and Guanine (4) 8. mechanism of gene transfer between bacteria in direct contact of each other (11) Down 2. One of the two polysaccharides which make up starch. An unbranched polymer of glucose (7) 3. mechanism by which water passes up the xylem of a plant from the roots to the leaves. The cohesion of water allows continuous columns under great tension (8, 7) 5. an antibacterial drug such as penicillin (10) 8. condensed mass of DNA that appears just before cell division. Each chromosome is one super-coiled DNA molecule containing thousands of genes. (10) 9. name given to the fact that in the presence of carbon dioxide, the affinity of haemoglobin for oxygen is lower (4, 6)
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