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Bio Exam 1 Review

Bio Exam 1 Review - Sarah Brenda Diana TJ BISC 220 Spring...

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Sarah, Brenda, Diana, TJ www.usc.edu/si BISC 220, Spring 2009 1 st Exam Review- Chapters 1-7 [email protected] Chapter 1 and 2 – Chemistry Review What are the three subatomic particles and what is their charge? Subatomic Particle Charge Electrons -1 Protons +1 Neutrons 0 An isotope refers to an element with the same number of protons but a different number of ________neutrons_____. What is an example of a strong bond? _____covalent____________. In some biological molecules we give the strong bond mentioned above a different name. Fill in the bond/linkage name: Between monomers of this biological molecule: Linkage name: All covalent Amino acids Peptide bond Carbohydrate Glycosidic linkage Lipids (between fatty acids and glycerol) Ester linkage Nucleic Acids Phosphodiester bond What is a mole? a. a small furry animal b. a mark (either a birthmark or sun-induced) on one’s skin that may be colored and/or raised. c. An undercover agent d. A highly spiced Mexican sauce made chiefly from Chili peppers and chocolate, served with meat e. The number of grams of a substance that equals its molecular weight in Daltons and contains Avogadro’s number of molecules. f. All of the above, but E is the best answer. What are the bio-organic elements: __ C _ ___ H ___ ____ O ___ ___ N ____ ___ P ___ ___ S __ A trace element is: a. an element that is found only in small amounts throughout the world. b. an element that can cause harmful effects, such as goiter. c. an element that is only required in small amounts. d. an element that the body requires. e. A and B f . C and D Water – Chapter 3 The image to the right shows a solute molecule surrounded by a hydration shell of water. Based on your knowledge of the polarity of water, the solute molecule is most likely. a. Positively charged b. Negatively charged c. Neutral in charge d. Hydrophobic e. Nonpolar Which pair of atoms has the greatest difference in electronegativity? a. C-H b. C-C c. C-N d. H-H e. C-O 1
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A molecule with two atoms is always what shape? ______ linear ______ Why does ice float? Ice is less dense. When water at 0 o it becomes locked in crystalline lattice. Boded t max # of hydrogens. 10% less dense than liquid. Some other properties of water that can be attributed to its hydrogen bonding include… 1. floating ice 2. universal solvent 3. thermodynamics a. heat of vaporization b. specific heat 4. surface tension A substance that has affinity for water is called _____ hydrophilic _______. It is contains mostly ______ polar ______ or ___ ionic ______ bonds. Substances that have no affinity for water are called ______ hydrophobic ____. They contain mostly ____ nonpolar ______ or ______ nonionic _____, and an example is: _______ oils _________. Assume that acid rain has lowered the pH of a particular lake to pH 5.0. What is the hydroxide ion concentration of this lake?
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