Biochem 2 Exam 1 Mastery Questions.

Biochem 2: Exam 1 Mastery Questions Saturated fatty acids are different to unsaturated fatty acids because they: A. have an even number of carbon atoms B. have short hydrophobic tails C. have no C=C double bonds D. exhibit free rotation about the carbon carbon bonds in the hydrocarbon tail E. mostly have cis double bonds - C. have no C=C double bonds Which of the following statements is FALSE? A. The longer the chain length of a saturated fatty acid, the higher the melting temperature B. The difference in melting temperature between a saturated fatty acid and an unsaturated fatty acid with the same chain length is only a few degrees Celsius. C. Most types of fat in many animals is used in energy production D. Some unsaturated fatty acids are liquid at physiological temperatures E. Fatty acids exist in the anionic form (RCOO-) at physiological pH - B. The difference in melting temperature between a saturated fatty acid and an unsaturated fatty acid with the same chain length is only a few degrees Celsius. Explanation: Unsaturated fatty acids tend to be more liquid because they cannot be packed as tightly as saturated fatty acids. Which of the following lipids can be a major component of biological membranes? A. Phosphatic acid B. Phosphatidylcholine C. Phosphatidylinositol D. Cholesterol E. B and D. - E. B and D Spingomyelin contains a fatty acid linked by an _________ bond and phosphocholine linked via the C-3 hydroxyl group of sphingosine. - Amide Which of the following is unlikely to be a characteristic of a membrane protein? A. Largely hydrophobic transmembrane segments Biochem 2: Exam 1 Mastery Questions B. α-helical membrane-spanning motifs C. Covalently attached lipid motifs D. Symmetric orientation across the membrane