Bio 121 LCC exam 1Questions With Correct Answers Guaranteed Pass.

Atom - correct answers smallest unit of matter Molecule - correct answers Formed when individual atoms bond together Organell - correct answers Molecules working together to perform a single function for the cell Cell - correct answers Smallest unit of life Tissue - correct answers2 or more cells working together to perform a function Organ - correct answers2 or more tissues performing a function Organ systems - correct answers2 or more organs performing a function Organism - correct answers All 11 systems working to form an individual Proton - correct answers has a positive charge and that is found in the nucleus of an atom Neutron - correct answers has no charge and that is found in the nucleus of an atom Electron - correct answers has a negative charge located in shells Atomic number - correct answers number of protons Atomic Mass - correct answers Number of protons and neutrons What are isotopes? - correct answers Atoms of the same element that have different numbers of neutrons ionic bonds - correct answers Formed when one or more electrons are transferred from one atom to another covalent bond - correct answers To obtain a full shell by sharing electrons Electronegativity - correct answers in left to right and down to up, The closer an atom has to a dill shell the stronger it desires electrons Properties of water - correct answers-Has a high specific heat and resists temp changes -Cohesion of water molecules accounts for surface tension and transportation Specific heat - correct answers The energy required to heat one gram of a substance by one Kelvin. Water insulates organisms - correct answers The large % of water in our body insulates us from temp changes Cohesion - correct answers-the result of numerous hydrogen bonds -the hydrogen bonds between molecules are stabilizing, causing water molecules to stick (cohese) together surface tension - correct answers-A measure of how difficult it is to stretch or break the surface of a liquid -At the surface of water, cohesion interactions are strong because there is no water above to H-bond to Transportation - correct answers-As water molecules in the leaves of vascular plants evaporate, cohesion pulls the next available water molecule to the surface. Solution - correct answers-Mix of 2 or more molecules solvent - correct answers The component of a solution that is present in the greatest amount Solute - correct answers The component of a solution that is present in the smallest amount How solutions work - correct answers-Each solute molecule becomes surrounded by solvent molecules Like dissolves like - correct answers-molecules that are polar covalently bonded (like sugars) are like water and dissolve -Ionic compounds (like salt) are also like water because of their charges on the ions Covalent molecules in water - correct answers-When sugar is added into water it dissolves -the sugar molecules partial charges get surrounded by water and the charges interact with each other Ionic molecules in water - correct answers-When salt is added to water it also dissolves -The ions separate and the ions with full charges are surrounded by water and the full charges of ions and partial charges of water interact 3 kinds of electrolytes - correct answers-Acid (hydrogen ion) -Base (hydroxide ion) -Salts Dissociation constant of water - correct answers Kw=[H+]x[OH-] Adding acid to water - correct answers You have more H+ ions than you started with Adding base to water - correct answers You have more H+ ions than you started with Kw never changes - correct answers-if [OH-] goes up then [H+] goes down Adding salts to water - correct answers-Neither H+ or OH- is present -This is why salts DO NOT change the pH of water H+ concentration is pH - correct answers-pH is -log[H+] -when [H+] goes up [OH-] goes down ex.) [H+] goes up to 10^-3 then pH changes to 3 Salts don't change the pH - correct answers[H+] and [O