Exam 1B marked to post

Exam 1B marked to post - Exam 1B CODE(on Scantron sheet...

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1 Exam 1B CODE (on Scantron sheet): 100002 1.The major difference between an ion and an atom is: a. An atom is smaller than an ion. b. An ion is an atom that has gained or lost one or more electrons. c. Atoms are electrically charged but ions have no net charge. 2. The top molecule is a water molecule and the bottom one is an amine (NH 3 ). The oxygen and nitrogen atoms are dark colored and hydrogen atoms are white. Which of the indicated bonds is a hydrogen bond? a. 1 b. 2 c. there are no hydrogen bonds 3. Which of these functional groups is/are hydrophobic (pick the single best answer)? Phosphate Methyl Hydroxyl 4. Are phospholipids hydrophilic or hydrophobic? a. Hydrophilic: the hydrogen atoms can form hydrogen bonds with water. b. Hydrophobic: carbon and hydrogen bonds are non-polar. c. Both: the phosphate portion will interact with water and the fatty acid tails will not interact with water. 5. What kinds of bonds are made and broken by dehydration and hydrolysis reactions? 6. What is a difference between an amino acid and a protein? a. amino acids can fold into various structures but proteins are locked into place by covalent and hydrogen bonds. b. a protein is composed of amino acids linked by peptide bonds c. a protein is a polysaccharide but amino acids are composed of polypeptides. 7. To sterilize culture media in the lab, we heat the solution well above the boiling temperature of water. Why does this kill cells” a. boiling disrupts electrons around atoms that compose the proteins b. boiling increases molecular motion and breaks bonds that maintain the tertiary structure of a protein. c. boiling breaks peptide bonds and proteins fall apart.
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2 8. Which of the arrows points to the 5’carbon in the ribose of this drawing of a portion of an RNA molecule? 9. Resolution is defined as the minimum distance two objects can be placed and still be resolved as two objects. The limit of resolution of a light microscope is about 0.2 µ m. What biological structure has the diameter of about 0.2 µ m? a. The nucleus of a eukaryotic cell b. The diameter of a typical plant cell. c. The diameter of a cilium on a eukaryotic cell d. The width of a cell membrane
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