Biology Terms (a) 9-1 spec. 0.0 / 5 ? BiologyDefinitionsGCSEEdexcel Created by: Billy B.Created on: 18-07-17 15:32 8924156 Across 1. One of the four bases of DNA (A) (7) 4. A type of respiration in which oxygen is used to release energy (7, 11) 5. system of sorting human blood into one of four phenotypes (A B AB O) on the basis of antogens on blood cells (3, 5, 5) 6. The pumping of particles across a cell membrane - requires energy (6, 9) 9. Stem cell found in specialised tissue that can produce more specialised cells in that tissue for growth and repair (5, 4, 4) Down 1. A cap like structure on the head of a sperm cell that contains enzymes used to penetrate an egg cell (8) 2. The features of something that allow it to do a certain job (8) 4. A measure of how common something is (9) 8. The space in an enzyme where the substrate fits during a enzyme catylised reaction (6, 4)
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