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Chapter 1 and 2 Biology questions with answers -score mark A+

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2 Parts to an atom - ANSWER 1.) Nucleus (made up of protons and neutrons) 2.) Shell (made up of electrons) Element - ANSWER Pure substance that consists entirely of one type of atom Isotopes - ... ANSWER Atoms of the same element that differ in the number of neutrons (unstable atom) Compound - ANSWER Substance formed by the chemical combination of two or more elements (physical/chemical properties are different for the elements it is formed) Ionic Bond - ANSWER One or more electrons are transferred from one atom to another (an electrical attraction between ions with opposite charges) Ion - ANSWER An atom that either gains or loses electrons (has a positive or negative charge) Covalent Bond - ANSWER Electrons travel about the nuclei of two atoms (shared valence electrons) Molecules - ANSWER The result of atoms joining together by covalent bonds (smallest unit of most compounds) Polar molecule - ANSWER Molecule in which the charges are unevenly distributed (in water molecule, oxygen exerts a stronger pull on the shared electrons than hydrogen) Hydrogen Bond - ANSWER The attraction between a hydrogen atom with a partial positive charge and another atom with a partial negative charge (hydrogen bonding with oxygen, nitrogen, and fluorine) Cohesion - ANSWER An attraction between molecules of the same substance (water molecules are drawn together). Cohesion produces surface tension Adhesion - ANSWER An attraction between molecules of different substances (Meniscus: adhesion between water molecules and glass molecules is stronger than the cohesion between water molecules) pH scale - ANSWER Measurement system made to indicate the concentration of hydrogen ions in solution (7-Neutral. Below 7-Acidic. Above 7-Basic) Acid - ANSWER Any compound that forms hydrogen ions in solution (HCl-hydrochloric acid) Base - ANSWER Compound that produces hydroxide ions in solution (NaoH-sodium hydroxide) Macromolecules - ANSWER Giant molecules formed by a process of polymerization (4 major groups of macromolecules are Carbs,lipids,nucleus acids, and proteins) Carbohydrates - ANSWER Living things use carbohydrates as main source of energy (plants,animals, and other organisms use carbs for structural purposes). Carbs also make cell membranes and cell walls Monosaccharides - ANSWER (Carb monomer) Single sugar molecules (glucose, galactose, and fructose) Polysaccharide - ANSWER (Carb polymer) Large macromolecules formed from monosaccharides Ex. Cellulose, Starch, Chitin, Gly [Show More]

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