UCI Bio 93 - Midterm 1 COMPLETE SET EXAM QUESTIONS WITH ANSWERS | VERIFIED

UCI Bio 93 - Midterm 1 COMPLETE SET EXAM QUESTIONS WITH ANSWERS | VERIFIED atoms - ANSWER smallest unit of chemical elements molecules - ANSWER two or more atoms combined compound - ANSWER two or more elements combined in a fixed ration C, O, H, N - ANSWER ... are 4 elements that make up 96% of all living matter covalent bond - ANSWER what is the strongest bond? covalent - ANSWER sharing of electrons by two atoms ionic - ANSWER transfer of electrons between two atoms hydrogen bond - ANSWER what is a weak bond? hydrogen bond - ANSWER the H atom forms one covalent bond and a second weaker bond with an atom in another molecules nonpolar - ANSWER equal sharing of electrons (two of the same element) polar - ANSWER unequal sharing of electrons has a charge (water) negative - ANSWER what is the charge of O in water? positive - ANSWER what is the charge of H in water? cohesion - ANSWER interactions between water molecules (H2O with H2O) solvent - ANSWER interactions between water and other molecules 4 bonds - ANSWER what is the maximum amount of bonds that hydrogen can form? 15% - ANSWER in room temperature of water what % is the maximum amount of bonds going to be made? more acidic - ANSWER when H+ concentration increases... more basic - ANSWER what H- concentration decreases... hydrophilic - ANSWER affinity for water (polar and ionic bonds) hydrophobic - ANSWER repel water (nonpolar covalent bonds) buffers - ANSWER chemical processes are sensitive to pH changes and resist change in the pH solution 7.4 - ANSWER the pH of human blood is... carbonic acid and bicarbonate - ANSWER what are the main buffers in blood? right - ANSWER response to a rise in pH in blood (becomes more basic) left - ANSWER response to a drop in pH in blood (becomes more acidic) carbon atoms - ANSWER building blocks for biological molecules 4 VE - ANSWER how many VE does carbon have? covalent bonds - ANSWER how do functional groups join to the carbon skeleton? hydroxyl - ANSWER -alcohols -polar -dissolves organic compounds (like sugars) carbonyl - ANSWER -ketones (within skeleton) -aldehydes (at the end of skeleton)