11. Which of following is a difference between a fat and oil? a. b. c. a fat has
ID: 141162 • Letter: 1
Question
11. Which of following is a difference between a fat and oil? a. b. c. a fat has a lower melting temperature than oil a fat contains unsaturated fatty acids and oil contains saturated fatty acids a fat contains saturated fatty acids and oil contains unsaturated fatty acids d. a fat has kinked fatty acid tails and oil has straight fatty acid tails 12. Which of following amino acids can form a disulfide bridge? a. glycine b. cysteine c. valine d. proline e. methionine 13. a-helices and B-sheets are examples of a protein's a. primary structure b. secondary structure c. tertiary structure d. quaternary structure 14. Sulfur can be found in a. triglycerides b. proteins c. carbohydrates d. nucleic acids 15. An ionic bond can form betweern a. b. c. d. two polar amino acids two hydrophobic amino acids two cysteine amino acids two oppositely charged amino acidsExplanation / Answer
11. Option C is the correct answer. Fats are composed high amounts of saturated fatty acids while oils are composed of high amounts of unsaturated fatty acids. Oils have kinked tails which do not pack tightly while saturated tails of fats pack tightly and thus oils are liquid while fats are solid at room temperature.
12. Option B is the correct answer. Disulfide bond is formed by sulphur containing amino acids. Here cysteine and methionine both are sulphur containing amino acid but methionine does not form disulfide bond.
13. Option B is the correct answer. Alpha helices and beta sheets are example of secondary structure of protein.
14. Option B is the correct answer. Sulphur can found in protein as few amino acids contain sulphur.
15. Option D is the correct answer. Ionic bonds are formed by oppositely charge atoms by electron transfer.
16. Option C is the correct answer. The exterior portions contain polar head groups while interior portions are hydrocarbon chain which are hydrophobic.
17. Option C is the correct answer.
18. Option D is the correct answer. Although cellulose is polymeric carbohydrate, it can be used by human as energy source because cellulose cannot be digested by human beings.
19. Option E is the correct answer. An amino acid contain an amino (NH2) group, an acid group and may contain a side chain residue.
20. Arrow is missing in the image.
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