Exam 25: Lipid Metabolism

Which of the following statements concerning lipogenesis is correct?

How many "turns" in the -oxidation pathway are needed to "process" a C₂₀ fatty acid molecule?

Use the following to answer the questions below: In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: -Statements: (1) Both TAG emulsification and TAG digestion occur in the small intestine. (2) On an equal-mass basis, fatty acids produce more than twice as much ATP per gram as carbohydrates (glucose). (3) The "opposite" processes of lipogenesis and fatty acid oxidation cannot occur at the same time.

Use the following to answer the questions below: In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: -Statements: (1) Initial triacylglycerol digestion usually produces monoacylglycerols rather than glycerol itself. (2) Fatty acids are the preferred fuel for "running" the heart (cardiac muscle) and the brain. (3) The ketone body acetoacetate is the "parent" compound for the other four ketone bodies.

Use the following to answer the questions below: In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: -Statements: (1) The human body, in the resting state, burns more fat than carbohydrate. (2) The initial stages of exercise are fueled primarily by glucose. (3) Statins lower plasma concentrations of LDL by inhibiting cholesterol synthesis in the liver.

The molecule carnitine is involved in

The correct sequence for the four reactions of the -oxidation pathway in terms of "functional group acted upon" is

Use the following to answer the questions below: Identify the step (1 through 4) in a "turn" in the -oxidation pathway at which each of the compounds would be encountered as a reactant using the response list. Responses may be used more than once or need not be used at all. -How many FADH₂ are produced?

Which of the following compounds is an intermediate in the conversion of glycerol to dihydroxyacetone phosphate?

Which of the following is a correct ordering of cholesterol intermediates as they are encountered during the biosynthesis of cholesterol?

The carrier of the "two carbon units" used to biosynthesize a fatty acid is

Use the following to answer the questions below: In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: -Statements: (1) The products of the first two stages of cholesterol biosynthesis are, respectively, mevalonate (C₆) and isopentenyl pyrophosphate (C₅). (2) Over 90 percent of total dietary lipids are triacylglycerols. (3) The activation stage of fatty acid oxidation involves both CoA and ATP.

Three of the following four compounds are classified as ketone bodies. The one that is not is

Which of the following is an intermediate in the process of lipogenesis?

Which of the following pairings of terms is correct for reactions in the -oxidation pathway?

Use the following to answer the questions below: On the left are characteristics of various reactions that occur in the chain elongation phase of fatty acid biosynthesis. Identify the step (1 through 4) of the chain elongation process to which each characterization applies using the response list on the right. Responses on the right may be used more than once or need not be used at all. -A carbon-carbon double bond is converted to a carbon-carbon single bond.

Use the following to answer the questions below: In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: -Statements: (1) The -oxidation pathway involves a repetitive series of four reactions. (2) Triacylglycerol mobilization is a hydrolysis process that occurs in adipose tissue. (3) ATP and ACP have similar functions within the human body.

Which of the following is a possible fate for the acetyl CoA produced from the degradation of a fatty acid?

Use the following to answer the questions below: Identify the step (1 through 4) in a "turn" in the -oxidation pathway at which each of the compounds would be encountered as a reactant using the response list. Responses may be used more than once or need not be used at all. -How many NADH are produced?

Use the following to answer the questions below: On the left are characteristics of various reactions that occur in the chain elongation phase of fatty acid biosynthesis. Identify the step (1 through 4) of the chain elongation process to which each characterization applies using the response list on the right. Responses on the right may be used more than once or need not be used at all. -A dehydration reaction occurs.