Across
- 2. nucleic acid that contains the sugar deoxyribose.
- 3. process that requires oxygen.
- 5. physical characteristics of an organism.
- 11. double-layered sheet that forms the core of nearly all cell membranes.
- 13. first step in releasing the energy of glucose, in which a molecule of glucose is broken into two molecules of pyruvic acid.
- 15. process in which part of the nucleotide sequence of DNA is copied into a complementary sequence in RNA.
- 16. organism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds; also called a producer.
- 17. situation in which one allele is not completely dominant over another.
- 18. idea that all living things are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells.
- 19. second phase of mitosis, during which the chromosomes line up across the center of the cell.
Down
- 1. movement of specific molecules across cell membranes through protein channels.
- 4. opening in the underside of a leaf that allows carbon dioxide and oxygen to diffuse into and out of the leaf.
- 6. change in a DNA sequence that affects genetic information.
- 7. science that seeks to understand the living world.
- 8. energy needed to get a reaction started.
- 9. protein that acts as a biological catalyst.
- 10. diagram that shows the evolutionary relationships among a group of organisms.
- 12. possible explanation for a set of observations or possible answer to a scientific question.
- 14. factor in an experiment that can change.
- 20. one of a number of different forms of a gene.