Across
- 5. organisms that make their own food
- 7. organisms that obtain energy from foods they consume
- 10. a pure substance that consists entirely of one type of atom
- 11. variable that is observed and that changes in response to the manipulated variable is called _______
- 13. positively and negatively charged atoms
- 14. smallest unit of most compounds
- 16. atoms of the same element that differ in the number of neutrons they contain.
- 18. amount of energy needed to raise the temperature of a gram of water degree celsius
- 19. a substance that speeds up the rate of a chemical reaction
- 21. variable that is deliberately changed
- 26. portion of the cell outside the nucleus
- 29. 2 tiny structures located in the cytoplasm near the nuclear envelope, separate and take up positions on opposite sides of the nucleus.
- 32. contain only a single set of chromosomes and therefore only a set of genes
- 33. the process of homologous chromosomes pairing up and forming tetras in meiosis I then exchanging portion of their chromatids is called ___
- 34. cells that do not contain nuclei
- 36. cell is able to reproduce so that a group of cells.
- 37. an organized way of using evidence to learn about the natural
- 38. strong forces bind protons and neutrons together to form the ______
Down
- 1. an attraction between molecules of the same substance.
- 2. the first and longest stage of mitosis
- 3. cells that contain nuclei
- 4. proposed scientific explanation for a set of observations
- 6. system a decimal system of measurements whose units are based on certain physical standards and are scaled on certain physical standards and are scaled on multiples of 10.
- 8. the site where lipid components of the cell membrane are assembled, along with proteins and other materials that are exported from the cell
- 9. the process of gathering information about events or processes in a careful, orderly way.
- 12. proteins that act as biological catalysts.
- 15. forms when electrons are shared between atoms
- 17. second phase of mitosis and often times only lasts a few minutes
- 20. small particles of RNA and protein found throughout the cytoplasm
- 22. plants use high energy of sunlight to convert water and carbon dioxide into high-energy carbohydrates
- 23. a slight attraction can develop between the oppositely charged regions of nearby molecules.
- 24. Bond/ formed when one or more electrons are transferred from one atom to another.
- 25. the science that employs the scientific method to study living things
- 27. devices that produce magnified images of structures that are too small to see with the unaided eye
- 28. a substance formed by the chemical combination of two or more elements in definite proportions.
- 30. region outside of the thylakoid membranes
- 31. a cell that contains both sets of homologous chromosomes
- 35. a disorder in which some of the body's own cells lose the ability to control cell growth