Across
- 3. It contains most of the cell's DNA and is usually the largest structure in a eukaryotic cell.
- 4. The process by which materials spread out from areas where there are more of them to areas where there are less of them; the simplest form of passive transport.
- 8. The membrane-bound sac in a plant cell that acts as a storage area.
- 11. Structures in the cytoplasm of eukaryotic cells. They perform all the activities necessary for life of a cell. They each have a specific structure or function.
- 12. Organisms composed of cells with a membrane-bound nucleus and other membrane-bound organelles. All protists, fungi, plants, and animals are these.
- 13. Single-celled organisms that do not have internal, membrane-bound parts. First organisms on Earth were these...
- 14. The diffusion of water across a selectively permeable membrane.
- 16. Provides the instruction for making proteins, directs cell activities, and enables the cell to reproduce. In some cells, it is enclosed in a nucleus.
- 19. They provide quick energy, can store energy, or provide structure.
- 20. Are made mostly from carbon and hydrogen atoms. They do NOT dissolve in water, so cell can store energy as these. They also provide insulation and make up cell membranes. Fats, oils, and waxes are common names for them.
- 21. A substance that speeds up the rate of a chemical reaction, but its not consumed by the reaction.
Down
- 1. Act as catalysts in the chemical reactors that take place in organisms. They each have a function that is determined by its shape.
- 2. The movement of materials across the cell membrane without using the cells energy.
- 5. The process in which a cell completely surrounds a substance to move materials into the cell.
- 6. The process by which organism keep internal conditions relatively stable regardless of change in the external environment.
- 7. An organelle that moves molecules from one part of the cell to another. It's covered with ribosomes.
- 9. The structure in a plant that protects and supports the plant and is not found in animal cells.
- 10. Organelles that convert glucose molecules into energy in the form of ATP (which is the cell's main energy source).
- 12. The process in which a vesicle in a cell joins with the cell membrane and then release its contents to the outside environment.
- 15. The organelle in plant cells where photosynthesis takes place.
- 17. Are made up of long chains of individual units called nucleotides. The two types of these are DNA and RNA. They contain info that determines how an organism grows and develops, and control the building proteins in cells.
- 18. Are made of carbon, hydrogen, oxygen, and nitrogen. They control cell functions, defend the organism, support transport and movement, and provide structure. They are made up of individual units called amino acids.