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Across 3. a descendant or the descendants of a person, animal, or plant; offspring. 4. the natural coloring matter of animal or plant tissue. 5. the branch of biology that deals with phylogeny. 9. Every biologist is familiar with the profile of the rate of an enzymatic reaction versus temperature 11. ribonucleic acid, a nucleic acid present in all living cells. 13. the pH at which an enzymatic or any other reaction or process is most effective under a given set of conditions. 14. any eukaryotic organism that has cells with nuclei and is not an animal, plant or fungus. 15. the production of new living organisms by combining genetic information from two individuals of different types (sexes).

Down 1. any of the class of soluble, crystalline, typically sweet-tasting carbohydrates found in living tissues and exemplified by glucose and sucrose. 2. The ingestion of liquid into a cell by the budding of small vesicles from the cell membrane. 3. The evolutionary development and history of a species or higher taxonomic grouping of organisms. 6. an enzyme that is responsible for making rna from a dna template. 7. colorless, odorless gas produced by burning carbon and organic compounds and by respiration. 8. a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. 10. the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. 12. the supportive tissue of an epithelial organ, tumor, gonad, etc., consisting of connective tissues and blood vessels.