Across
- 1. deoxyribonucleic acid, a self-replicating material which is present in nearly all living organisms as the main constituent of chromosomes. It is the carrier of genetic information.
- 3. a compound which is one of the four constituent bases of nucleic acids. A pyrimidine derivative, it is paired with adenine in double-stranded DNA.
- 5. a compound found in living tissue as a constituent base of nucleic acids. It is paired with guanine in double-stranded DNA.
- 8. a sugar derived from ribose by replacing a hydroxyl group with hydrogen.
- 11. a threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes.
- 13. a compound that occurs in guano and fish scales, and is one of the four constituent bases of nucleic acids.
- 14. an association between two organisms in which one benefits and the other derives neither benefit nor harm.
- 15. the resting phase between successive mitotic divisions of a cell, or between the first and second divisions of meiosis.
- 17. cycle 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.
- 20. the first stage of cell division, before metaphase, during which the chromosomes become visible as paired chromatids and the nuclear envelope disappears. The first prophase of meiosis includes the reduction division.
- 22. base A nitrogenous base, or nitrogen-containing base, is an organic molecule with a nitrogen atom that has the chemical properties of a base.
- 23. describes the ecological interaction between two or more species where each species benefits
- 24. They are one of the building blocks of body tissue and can also serve as a fuel source.
Down
- 2. a compound which is one of the four constituent bases of nucleic acids. A purine derivative, it is paired with thymine in double-stranded DNA
- 4. the second stage of cell division, between prophase and anaphase, during which the chromosomes become attached to the spindle fibers
- 6. any of a large group of organic compounds occurring in foods and living tissues and including sugars, starch, and cellulose
- 7. physical rather than biological; not derived from living organisms
- 9. a compound consisting of a nucleoside linked to a phosphate group. Nucleotides form the basic structural unit of nucleic acids such as DNA.
- 10. relating to or resulting from living things, especially in their ecological relations.
- 11. a person or thing that eats or uses something.
- 12. a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane.
- 16. he practice of living as a parasite in or on another organism.
- 18. any of a class of organic compounds that are fatty acids or their derivatives and are insoluble in water but soluble in organic solvents
- 19. acid a complex organic substance present in living cells, especially DNA or RNA, whose molecules consist of many nucleotides linked in a long chain.
- 21. They get energy from chemicals or the sun, and with the help of water, convert that energy into useable energy in the form of sugar, or food