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Apologia Biology M2
Apologia Exploring Creation with Biology Module 2
Term | Definition |
---|---|
Matter | Anything that has mass and takes up space (has volume) |
Atomic number | The number of protons in an atom--unique to each type of atom |
Elements | A collection of atoms that all have the same number of protons |
Periodic table | A table of the chemical elements arranged in order of atomic number |
Isotopes | One of several forms of an element, each containing the same number of protons but a different number of neutrons |
Atomic mass | The sum of the protons and neutrons in an atom |
Molecule | Chemicals that result when two or more atoms join together chemically |
Compound | A molecule that contains atoms of at least two different elements |
Ionic bond | A chemical bond formed when one or more electrons are transferred from one atom to another |
Ion | Positively or negatively charged atoms resulting from the transfer of electrons |
Covalent bond | Chemical bond formed by the sharing of electrons between two or more atoms |
Polar compound | A molecule in which there is an unequal distribution of the negatively charged electrons causing a partial positive charge at one end and a partial negative charge at the other. |
Hydrogen bonds | A weak electrical attraction between a partially positive hydrogen atom and a partially negative atom of another molecule (usually oxygen or nitrogen) |
Solvent | A substance in which other substances are dissolved; for example, water |
Solute | A dissolved substance |
Solution | A mixture of solutes dissolved in a solvent |
Aqueous solution | A solution in which water is the solvent |
Cohesion | An attractive force that holds molecules of the same substance together |
Adhesion | An attractive force that holds molecules of different substances together |
Heat capacity | The amount of heat energy required to increase the temperature |
Organic molecules | Molecules found in living organisms that contain carbon in rings or long chains, attached to other atoms like: hydrogen, oxygen, nitrogen, sulfur, and/or phosphorus |
Biosynthesis | The process by which living organisms produce larger molecules from smaller ones |
Isomers | Two different molecules that have the same chemical formula |
Monosaccharides | The building blocks of more complex carbohydrates, also called simple sugars |
Disaccharides | Carbohydrates that are made up of two monosaccharides |
Polysaccharides | Carbohydrates that are made up of more than two monosaccharides |
Dehydration reaction | A chemical reaction in which molecules combine by removing water |
Starch | A polysaccharide consisting of many glucose molecules stored in plants |
Glycogen | A polysaccharide consisting of many glucose molecules store in animals |
Cellulose | A polysaccharide consisting of many glucose molecules found in the cell wall of plants |
Hydrolysis | Breaking down complex molecules by the chemical addition of water |
Hydrophobic | Lacking any affinity to water, from the Latin meaning "water-fearing" |
Saturated fat | A lipid made from fatty acids that have no double bonds between their carbon atoms |
Unsaturated fat | A lipid made from fatty acids that have at least one double bond between their carbon atoms |
Steroid | Lipid molecule with four fused carbon rings |
Amino acids | The building blocks of proteins each containing a carboxyl group and an amino group |
Hydrophilic | Attracts water molecules |
Peptide bond | A bond that links amino acids together in a protein |
Activation energy | The energy needed to get reactions started |
Active site | Area of an enzyme to which a specific substrate fits |
Substrate | A specific reactant acted on by an enzyme |
Denaturation | The process in which the normal shape of a protein is lost, usually due to heat |
Nucleotides | The building blocks on DNA and RNA |