Across
- 3. functional proteins that bring molecules together or split them apart in chemical reactions
- 8. a group of similar cells that all developed together and perform a certain function
- 9. relative constancy of the healthy body's internal environment; "staying the same"
- 11. a type of signal that moves away from an integrating center or other point of reference
- 12. any state or condition in the body that can change or vary
- 13. a functional group that is temporarily unattached and is highly reactive due to unpaired electrons
- 16. includes DNA and RNA; composed of nucleotides, a ribose or deoxyribose pentose sugar, and a phosphate group
- 19. a range of normal values of a regulated variable
- 20. a chemical bond formed by the transfer of electrons from one atom to another through a strong electrostatic force
Down
- 1. amplifies or reinforces a change that is occurring; does not help the body maintain homeostasis
- 2. a steroid found in the plasma membrane surrounding every cell in the body
- 4. chemical reactions that build chemical molecules from smaller subunits; require energy
- 5. a structure made up of several different kinds of tissues arranged to perform a special function
- 6. divides the body into right and left parts
- 7. midportion of the thoracic cavity that contains the heart and other structures
- 10. the smallest and most numerous structural unit that possess and exhibit the basic characteristics of living matter
- 14. the elements that make up a protein molecule and bind together to form chemical units
- 15. large organic molecules important in living organisms
- 17. chemical reaction that breaks down larger molecules into smaller chemical units; releases energy
- 18. an element that contains the same number of protons but different numbers of neutrons of a given element