1361-Unit-1-Lecture-_42726 - UNIT I Lecture Questions 1. A...

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Unformatted text preview: UNIT I Lecture Questions 1. A cell is capable of reproduction, but when the cell’s components are isolated, none of them can reproduce. Thus, reproduction is an example of: a. Reductionism b. Adaptation c. An emergent property d. Natural selection e. Form fitting function 2. Evolution is biology’s core theme because it explains... a. the unity & diversity of life b. why some organisms have traits in common c. how organisms become adapted to their environment d. why descendant species differ from their ancestors e. all of the above 3. A key point in Darwin's explanation of evolution is that: a. the biological structures most likely inherited are those that have become better suited to the environment through constant use. b. mutations that occur are those that will help future generations fit into their environments. c. slight variations among individuals significantly affect the chance that a given individual will survive in its environment and be able to reproduce. d. genes change in order to help organisms cope with problems encountered within their environments. e. extinction is nature's way of weeding out undeserving organisms. 4. ____ are the differences among organisms that allow for life in such a wide variety of environments on Earth. a. b. c. d. prokaryotic cells eukaryotic cells adaptations multicellularity 5. Which statement is true? a. b. c. d. e. Flow of information in life: Protein RNA DNA Multicellular organism capable of converting sunlight to chemical energy: in Domain Eukarya, Kingdom Fungi Heterotrophs can utilize carbon dioxide (CO2) as their source of organic carbon. The sequence of nucleotides in DNA is grouped into genes which specify different amino acid sequences. Negative feedback: common control mechanism to maintain homeostasis in an organism. 6. Which of the following atomic numbers would describe the element that is least reactive? a. b. c. d. e. 1 8 1 2 1 6 18 2 7. Which of the following is false concerning electrons? a. b. c. d. e. Electrons occupy orbitals around the nucleus of an atom. Outer shell electrons have more potential energy than those closer to the nucleus. Atoms with paired electrons in their outer shell would be highly reactive. Atoms that share electrons form covalent bonds. None are false statements, they are all true. 8. For hydrogen bonding to occur, water molecules must be involved. T or F? 9. Which of the following molecule(s) is/are capable of forming a hydrogen bond? Circle all that apply. a. b. c. d. CH4 H2O NaCl NH3 10. Oxygen is significantly more electronegative than carbon. What does this fact say about acetone, the active ingredient in nail polish remover? a. The C=O bond in acetone is a nonpolar covalent bond. b. Acetone is soluble in water. c. There is a partial positive charge around the oxygen atom in acetone. d. All are true regarding acetone. e. Only 2 & 3 are true. 11. In a reaction in chemical equilibrium, a. b. c. d. e. the forward & reverse reactions are occurring at the same rate. the reactants & products are in equal concentration. the forward reaction has gone further than the reverse direction. there are equal numbers of atoms on both sides of the equation. a, b, & d are correct. 12. Solution A has a pH of 4, solution B a pH of 1. Which of the following statements apply? a. b. c. d. e. Solution A has 4X fewer H+ ions than solution B. Solution B has a 1000X more H+ ions than solution A. Solution B is 4X more acidic than solution A. Solution A has 1000X more H+ ions than solution B. There is more than one correct answer here. 13. Which molecule pair is correctly matched with its isomer form? a. b. c. d. e. D, F: structural isomers A, C: geometric isomers B, E: enantiomers D, F: geometric isomers A, C: structural isomers 3 14. Which functional group(s) are present in this molecule? a. b. c. d. e. Sulfhydryl Hydroxyl Amino Carboxyl Methyl 15. Reactions in which a polysaccharide is broken down into monosaccharides: a. b. c. d. require breakage of peptide bonds are condensation reactions depend upon disrupting van der Waals forces involve the addition of water 16. Sucrose is made by linking a glucose (C6H12O6) and a fructose (C6H12O6) molecule in a dehydration reaction. What is the molecular formula for this disaccharide? a. C6H12O6 b. C12H22O11 c. C10H20O10 d. C12H24O12 e. C12H24O13 17. Which is correct regarding the molecules A ‐ F? a. b. c. d. e. Polysaccharide: combine multiple monomers of E, or F, or D. Fat: 3 of E + 1 of D Phospholipid: 2 of A + 1 of D + 1 of C Oil: 3 of A + 1 of D 2 or more of the above are correct. 4 18. What are molecules 1‐6? a. b. c. d. Which would have hydrophobic interactions? Which residues would H‐bond to each other? Which would H‐bond to water? Which part of molecules 1‐6 contribute to the tertiary structure of a protein, A or B? 19. The secondary structure of a protein involves: a. b. c. d. e. f. g. Interaction between 2 different polypeptide chains Hydrogen bonding R groups Only atoms of the polypeptide backbone All are correct Two answers are correct Three answers are correct 20. The structural level of a protein least affected by a disruption in hydrogen bonding is the a. primary level b. tertiary level c. secondary level d. quarternary level 21. If a DNA sample were composed of 10% thymine, what would be the percentage of guanine? a. b. c. d. e. 10% 20% 40% 80% Cannot tell from the information given. 22. Which DNA strand is complimentary to: 5’ A G G T C 3’? a. b. c. d. e. 5’ A G G T C 3’ 5’ U C C A G 3’ 5’ T C C A G 3’ 5’ G A C C T 3’ No correct answer given ...
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This note was uploaded on 10/16/2010 for the course HE 012928 taught by Professor Storrs,london during the Spring '10 term at École Normale Supérieure.

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