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Midterm #1 Answers - A This section consists of short...

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Unformatted text preview: A. This section consists of short answer questions. Each is worth 3 points. Answer in the space provided and be succinct! 1. List two properties of living cells that viruses do not have. Metabolism, response to stimuli, ability to utilize genome (transcription and translation), not made of cells Any 2 for 3 points 2. Illustrate the hydrogen bonding seen between water and a carbonyl group. Don’t need partial charges, do need to mark clearly which is H bond 3. Illustrate the structure of an amino group pH 10.0. 4. Why is cellulose not considered a nutritional polysaccharide? Because we don’t have an enzyme capable of breaking its bonds ( β 1-4) 5. Indicate two features shared by fats and phospholipids and one difference. Both have glycerol backbone, both have fatty acids attached Phospholipids have polar head group on third position, fats do not. One point each 6. Which has the lower melting point, a cis-unsaturated or a trans unsaturated fat? Why? Cis. Because cis adds kinks to chain making it harder to solidify. Trans doesn’t add the kinks 1 point for correct answer, two for correct argument. 7. To what group (i.e. polar charged, polar uncharged, non-polar, etc.) does each of the following amino acids belong (answer goes on the line under the drawing): (a)____ Polar charged ____ (b)_______ non-polar ______________ (c)_____ polar uncharged ________ 8. Which of the amino acids above (a, b or c) would be most likely to be found buried within the internal structure of the protein? Why did you choose that one? b 9. Hydrogen bonding can be part of both secondary and tertiary structure. What is the difference between these types of hydrogen bonding? In secondary the hydrogen bonds are between peptide bond elements, in tertiary they are between side chains. 10. The pH within a lysosome is about 5, but the pH of the surrounding cytoplasm is 7....
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