Biology

3. * any of a class of nitrogenous organic compounds that consist of large molecules composed of one or more long chains of amino acids
5. carries nerve signals from your brain to your body and vice versa. These nerve signals help you feel sensations and move your body.
6. thread-like structures located inside the nucleus of animal and plant cells.
8. the complex process of turning the food you eat into nutrients, which the body uses for energy, growth and cell repair needed to survive.
11. * a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some that can cause disease.
12. an infectious agent that can only replicate within a host organism.
13. portion of a nerve cell (neuron) that carries nerve impulses away from the cell body

1. are the fundamental units of the brain and nervous system, the cells responsible for receiving sensory input from the external world, for sending motor commands to our muscles
2. two large tubes that carry air from your windpipe to your lungs
3. the process by which green plants and certain other organisms transform light energy into chemical energy
4. the separation and throwing off of waste materials or toxic substances from the cells and tissues of a plant or animal.
7. the act or process of breathing
9. an organism that causes disease
10. a structural layer surrounding some types of cells, just outside the cell membrane.