Living Environment Chemistry

Term Definition
Acid A compound that forms H+ ions in a solution.Acidic solutions have higher concentrations of H+ ions than pure water and have pH values below 7.
PH Scale A measurement system called pH scale to indicate the concentration of H+ ions in a solution. Ranges from 0-14. pH of 7 indicates ions are equal. pH below 7=acidic pH above 7 are basic
Carbohydrate Compounds of carbon, hydrogen, and oxygen atoms.Living things use carbohydrates as "main" source of energy.Four groups of organic compounds in living things are: carbohydrates, lipids, nucleic acid, and proteins.
Monomer/polymer Built by joining smaller compounds together.Form in to polymers-may be identical or different
Buffers Weak acids or bases that can react with strong acids or bases to prevent sharp, sudden changes in pH.
Substrate reactant of an enzyme-catalyzed reaction (brought together to react)
Enzyme Proteins that act like biological catalysts. They speed up chemical reactions that take place in cells.
Protein Macromolecules that contain nitrogen, carbon, hydrogen, and oxygen are polymers of molecules called amino acid.
Nucleic Acid Macromolecules containing hydrogen, oxygen, nitrogen, carbon, and phosphorus are polymers in nucleotides.They store and transmit hereditary and organic information.2 types: ribonucleic RNA, and deoxyribonucleic DNA
Lipid Large variety group of biological molecules (not soluable in water) used to store energy.
Bases A compound that produces hydroxide in solution.

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