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Across 1. is the double lipid bilayer membrane, which surrounds the genetic material. 5. a mature haploid male or female germ cell that is able to unite with another of the opposite sex in sexual reproduction to form a zygote. 8. the central and most important part of an object, movement, or group, forming the basis for its activity and growth. 9. a plastid that contains chlorophyll and in which photosynthesis takes place 12. an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. 13. an organelle in the cytoplasm of eukaryotic cells containing degradative enzymes enclosed in a membrane. 17. the process whereby organisms better adapted to their environment tend to survive and produce more offspring. 18. a person, company, or country that makes, grows, or supplies goods or commodities for sale 23. an organism, esp. a soil bacterium, fungus, or invertebrate that decomposes organic material. 26. containing two complete sets of chromosomes, one from each parent. Compare. 27. a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth. 28. the material or protoplasm within a living cell, excluding the nucleus.

Down 2. the more fluid, granular inner layer of the cytoplasm in amoeboid cells 3. the semipermeable membrane surrounding the cytoplasm of a cell. 4. a molecule that is involved in the maintenance and metabolic processes of living organisms. 6. animal that feeds on plants. 7. the branch of biology that deals with the relations ofcontaining degradative enzymes enclosed in a membrane. 10. a mature haploid male or female germ cell that is able to unite with another of the opposite sex in sexual reproduction to form a zygote. 11. the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth. 14. an animal or person that eats food of both plant and animal origin. 15. n organism deriving its nutritional requirements from complex organic substances. 16. a mature haploid male or female germ cell that is able to unite with another 19. a minute particle consisting of RNA and associated proteins, found in large numbers in the cytoplasm of living cells. 20. a mature haploid male or female germ cell that is able to unite with another of the opposite sex in sexual reproduction to form a zygote. 21. a rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria 22. a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth. 24. a diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum 25. a person who purchases goods and services for personal use.