Across
- 3. a tiny organelle found in large numbers in all cells; prokaryotic ones are smaller (20 nm diameter) than eukaryotic ones (25 nm diameter); made of protein and ribosomal RNA and consist of two subunits; they are the sites of protein synthesis in cells
- 8. the photosynthetic organelle in eukaryotes
- 10. the number of times greater that an image is than the actual object
- 12. a pore-like structure found in plant cell walls; these structures of neighbouring plant cells line up to form tube-like pores through the cell walls, allowing the controlled passage of materials from one cell to the other; the pores contain ER and are lined with the cell surface membrane
- 15. a relatively large organelle found in eukaryotic cells, but absent from prokaryotic cells; contains the cell’s DNA and therefore controls the activities of the cell
- 16. the loosely coiled form of chromosomes during interphase of the cell cycle; chromatin is made of DNA and proteins and is visible as loosely distributed patches or fibres within the nucleus when stained
- 17. one of two small, cylindrical structures, made from microtubules, found just outside the nucleus in animal cells, in a region known as the centrosome; they are also found at the bases of cilia and flagella
- 18. wall surrounding prokaryote, plant and fungal cells; contains a strengthening material which protects the cell from mechanical damage, supports it and prevents it from bursting
- 19. a functionally and structurally distinct part of a cell, e.g. a ribosome or mitochondrion
- 20. a spherical organelle found in eukaryotic cells; contains digestive (hydrolytic) enzymes and has a variety of destructive functions, such as removal of old cell organelles
Down
- 1. apparatus an organelle found in eukaryotic cells; consists of a stack of flattened sacs; vesicles carry their contents to other parts of the cell, often to the cell surface membrane for secretion; the organelle chemically modifies the molecules it transports
- 2. an organelle found in eukaryotic cells; a large, permanent central _____ is a typical feature of plant cells, where it has a variety of functions, including storage of biochemicals such as salts, sugars and waste products; temporary ________, such as phagocytic ______ (also known as phagocytic vesicles), may form in animal cells
- 4. the organelle in eukaryotes in which aerobic respiration takes place
- 5. reticulum a network of flattened sacs running through the cytoplasm of eukaryotic cells; molecules, particularly proteins, can be transported through the cell inside the sacs separate from the rest of the cytoplasm; continuous with the outer membrane of the nuclear envelope
- 6. containing a nucleus and other membrane-bound organelles
- 7. the contents of a cell, excluding the nucleus
- 9. does not contain a nucleus or any other membrane-bound organelles; includes bacteria and archeans
- 11. the ability to distinguish between two objects very close together; the higher the resolution of an image, the greater the detail that can be seen
- 13. a small structure, one or more of which is found inside the nucleus; is usually visible as a densely stained body; its function is to manufacture ribosomes using the information in its own DNA
- 14. the partially permeable membrane that surrounds plant vacuoles