Term | Definition |
atom | smallest particle of an element that keeps the chemical identity of that element. |
lipids | energy-rich compounds that include fats, oils, and waxes. |
cholesterol | a lipid found in animal products that can lead to coronary artery disease. |
carbohydrates | energy-rich compounds such as starch, glucose, and sucrose. |
starch | plants store energy as large carbohydrate molecules. |
elements | 92 of them make millions of different compounds. |
pH scale | the amount of acid or base in water |
water | excellent solvent that is capable of dissolving almost everything. |
proteins | made of smaller molecules called amino acids. |
carbon | makes most of the compounds that make up life. |
carbon, oxygen, and hydrogen | are the most abundant atoms in living organisms. |
DNA | nucleic acid that contains the information cells need to make proteins |
proteins | hair, fingernails and skin |
starch | rice, potatoes, and bread |
dark zone | sunlight does not reach this area of the ocean. few organisms live here |
habitat | a place where an organism lives |
element | simplest form of matter |
water | supports life because 1. it dissolves just about anything 2. has a high specific heat 3. stays liquid at a wide range of temperature |
product | what the react molecules make (is shown after the arrow in a chemical formula). |
reactant | molecules combined to make a product (before the arrow in the chemical formula). |
chemical reaction | rearranging atoms in one substance into a new substance |
photosynthesis | water + carbon dioxide ---> glucose + oxygen |
compound | 2 or more different ELEMENTs that are chemically joined |
molecule | group of two or more ATOMs joined together chemically |
water | 2 hydrogen atoms + 1 oxygen atom |