crossword #1

5. - Developed vaccination.
6. – These are involved in protein synthesis.
9. - First to observe bacteria.
11. - Disproved spontaneous generation.
13. - Used the first synthetic chemotherapeutic agent.
16. – It is the region in the cytoplasm where the genetic material is present.
17. – These are long structures in the form of a whip, that help in the locomotion of a cell.
18. – Plasmids are non-chromosomal DNA structures. These are not involved in reproduction.
19. - Observed that viruses are filterable material.
20. - Discovered penicillin.

1. - First to observe cells in plant material and name them.
2. -does not have a nuclear membrane
3. -It is an outer protective covering found in the bacterial cells, in addition to the cell wall. It helps in moisture retention, protects the cell when engulfed, and helps in the attachment of cells to nutrients and surfaces.
4. – This layer surrounds the cytoplasm and regulates the entry and exit of substances in the cells.
7. - Proved that microorganisms can cause disease.
8. – The cytoplasm is mainly composed of enzymes, salts, cell organelles and is a gel-like component.
10. - First to use disinfectants in surgical procedures.
12. – These are hair-like outgrowths that attach to the surface of other bacterial cells.
14. – It is the outermost layer of the cell which gives shape to the cell.
15. - Said living cells arise from preexisting living cells.