Across
- 2. Composed of several or many cells
- 7. A process in which living organisms involving the production of energy
- 10. A rigid external covering for the body in some invertebrate animals
- 11. The primary function of the lungs involving the transfer of oxygen from inhaled air into the blood and the transfer of carbon dioxide from the blood into the exhaled air
- 12. An inert carbohydrate, the chief constituent of the cell walls of plants and of wood, cotton, hemp, paper, etc
- 14. Submicroscopic infectious agent that replicates only inside the living cells of an organism
- 15. Movement of molecules from a region of its higher concentration to a region of lower concentration
- 16. Hereditary material in humans and almost all organisms
Down
- 1. Each of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome
- 3. Microorganisms which are similar to bacteria in size and simplicity of structure but radically different in molecular organization
- 4. Group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction
- 5. Movement of water through a semipermeable membrane according to the concentration gradient of water across the membrane, which is inversely proportional to the concentration of solutes
- 6. A cold-blooded vertebrate animal of a class that comprises the frogs, toads, salamanders, and caecilians. Distinguished by having an aquatic gill-breathing larval stage followed by a terrestrial lung-breathing adult stage
- 8. The movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy
- 9. A substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction
- 13. Having or consisting of one cell