Solve these clues to fill the grid.
- German physiologist and histologist who in 1838 and 1839 identified the cell as the basic structure
- 2 Across
- Bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb
- 4 Across
- Having cells that lack membrane-bound nuclei
- 6 Across
- A netlike structure in the cytoplasm of animal cells
- 10 Across
- Center of an atom or a cell
- 11 Across
- A person who relies on another person for support
- 14 Across
- An organelle in the cytoplasm of a living cell (plural)
- 15 Across
- A writer or artist who sells services to different employers without a long-term contract with any
- 16 Across
- A standard or comparison condition used to help judge the effect of a variable in an experiment.
- 1 Down
- The protoplasm of a cell excluding the nucleus
- 3 Down
- Something that is likely to vary
- 5 Down
- Plastid containing ___ and other pigments
- 7 Down
- The act of conducting a controlled test or investigation
- 8 Down
- An organelle found in the cytoplasm of most cells (plural)
- 9 Down
- Any of several complex proteins that are produced by cells and act as catalysts in specific (plural)
- 12 Down
- A rigid layer of polysaccharides enclosing the membrane of plant and prokaryotic ___
- 13 Down
