Across
- 5. groupings of similar cells
- 6. the fluid that fills a cell
- 7. letting some (usually very small, uncharged) substances through, but not others
- 13. tunnelling microscope a type of electron microscope that uses the quantum-mechanical tunnel effect to study atomic structures and observe single atoms
- 14. organisms with cells that contain a distinct nucleus
- 15. the outermost layer of cells in plants and animals
- 18. a microscope that uses a beam of electrons instead of light to obtain the
- 19. so that any differences observed must be due to the variable being tested
- 20. requires electrons to pass through very fine slices of tissue
- 24. diffusion of water through a semipermeable membrane from a dilute solution to a concentrated solution until there is an equal concentration of fluid onboth sides of the membrane
- 25. small structures inside eukaryote cells
- 27. a person who studies the branch of
- 28. a microscope that is built from two or more lenses, one of which is in the single eyepiece. It is used to magnify very small objects such as a drop of water or a very
- 29. a very thin piece of glass that is used to cover a specimen on a microscope slide
- 32. a complex structure in a large organism, such as an eye, wing or leaf, that performs a specific function
- 34. organisms built from more than one cell
- 37. the stiff outside layer of a plant cell
- 38. the chemical reaction in which carbon dioxide and water are converted into
- 39. slice of tissue.
- 40. caused by loss of water through osmosis
Down
- 1. organisms whose cells do not have a nucleus
- 2. that deals with microorganisms
- 3. the outer skin of a plant or animal cell
- 4. to become widely dispersed; spread out
- 7. involves electrons interacting only with the surface of the object being viewed
- 8. glucose and oxygen. This process requires chlorophyll and sunlight. It occurs within the cells that are present in the chloroplasts of plant leaves.
- 9. the organelles found in plant cells in which photosynthesis occurs
- 10. a factor in an experiment that may affect the results and that can be changed
- 11. a process in which chloroplasts and other organelles can move around the cytoplasm of living cells
- 12. within the cell, growth and reproduction
- 16. and can magnify things up to a million times. Transmission electron microscopes and scanning electron microscopes are the two main types.
- 17. test a test in which the effect of one variable is tested and all other variables are kept the
- 21. a large, membrane-bound structure that controls a living cell, including chemical
- 22. shrinkage or contraction of the cytoplasm away from the wall of a living
- 23. a fluid-filled cavity in the cytoplasm of plant cells
- 26. organisms organisms that consist of a single cell
- 30. the process in which nutrients are converted into useful energy in a cell
- 31. a process in which sugars are converted to alcohol and carbon dioxide by organisms such as yeast to obtain their energy
- 33. the building blocks of living things
- 34. (singular: mitochondrion)an organelle that supplies the cell with energy
- 35. repeat trials of experimental tests, to reduce random sampling errors
- 36. their effects on other living organisms