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Biology
Chapter 3
| Question | Answer |
|---|---|
| Valence electron | an electron that is found in the outermost shell of an atom andthat determines the atom's chemical properties |
| Chemical bond | the ATTRACTIVE force that holds atoms or ions together |
| Compound | a substance made of the ATOMS of TWO or more different ELEMENTS joined by CHEMICAL BONDS |
| Covalent bond | a bond formed when ATOMS share ONE or more PAIRS OF ELECTRONS |
| Molecule | a GROUP OF ATOMS HELD TOGETHER by CHEMICAL forces, a SMALLEST UNIT OF MATTER that can exist by itself and retain al of a substance's chemical properties |
| Ion | an atom or GROUP OF ATOMS that was an electric charge because it has GAINED OR LOSTED ELECTRONS |
| Hydrogen bonding | can play an important role in many of the molecules that MAKE UP LIVING THINGS |
| Latent heat | can cut organisms maintain a constant internal temperature |
| Cohesion | the force that holds molecules of a single material together |
| Adhesion | the attractive force between two bodies of different substances that are in contact with each other |
| Solution | a homogeneous mixture throughout which two or more substances are uniformly dispersed |
| pH | a value that is used to express the acidity of a system |
| Buffer | a solution made from a weak acid and its conjugate base that neutralize small amounts of acids added to it |
| Base | any compound that increase the number of hydroxide ion when dissolved in water |
| Acids | any compound that increase the number of hydronium ions when dissolved in water |
| Carbohydrates | a class of molecules that are mode of sugars |
| Lipid | a fat molecules that has the similar properties |
| Protein | an compound made of one or more chains of amino acids |
| Amino acid | a compound of a class of simple compounds |
| Nucleic acid | a long chain of nucleotide units |
| Nucleotide | a molecule made up of three parts |
| DNA | the material that contains the information that determines inherited traits |
| RNA | all living cells that plays a role in protein sythesis |
| ATP | the main source for cell processes |
| Enzyme | a molecule that acts as a catalyst in reactions |
| Atom | the smallest unit of matter |
| Element | a substance that cannot be separated into simpler substances by chemical means |
| Energy | The capacity to do work |
| Reactant | A substance or molecule that participates in a chemical reaction |
| Product | A substance that forms in a chemical reaction |
| Activation energy | The minimum amount of energy required to start a chemical reaction |
| Substrate | The reactant in reactions catalyzed by enzymes |
| Active site | The site that attaches to a substrate on an enzyme |
Created by:
Victoria718
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