Exam 26: Protein Metabolism

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) Properties of the compound urea include yellow color, strong odor, and high solubility in water. (2) The amino group acceptor in most transamination reactions is oxaloacetate. (3) Absorption of amino acids through the intestinal wall requires active transport.

Use the following to answer the questions below: For each of the urea cycle characterizations, select a correct response from the response list. Responses may be used more than once or need not be used at all. -Reacts with carbamoyl phosphate

Use the following to answer the questions below: In each of the following reactant-product combinations associated with the production of urea, contrast the nitrogen content of the two compounds using the response list. Responses may be used more than once or need not be used at all. -Citrulline-argininosuccinate

Use the following to answer the questions below: Following are reactants and the type of reaction they undergo. From the response list, select the product to which each reactant is converted. Responses may be used more than once or need not be used at all. -Transamination involving oxaloacetate

Use the following to answer the questions below: For the degradation products found for a particular amino acid carbon skeleton, use the response list to characterize the amino acid in terms of ketogenicity and glucogenicity. -Acetyl CoA only

Use the following to answer the questions below: For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all. -Substance that gives urine its characteristic color

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) Protein digestion begins in the stomach rather than the small intestine. (2) In the second step of heme degradation, biliverdin is converted to bilirubin. (3) In the oxidative deamination of glutamate, alpha-ketoglutarate is one of the products.

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) Excess amino acids are stored in the body for later use in the form of tetra- and pentapeptides. (2) The ultimate product of all transamination reactions is the amino acid glutamate. (3) The oxygen atom in urea comes from a water molecule that participates in a hydrolysis reaction.

Which of the following processes supplies amino acids to the amino acid pool?

Which of the following conversions could occur as part of a ansamination reaction?

As dietary protein materials leave the stomach, they

With a normal diet, the percentage of daily calories that come from proteins is about

Use the following to answer the questions below: For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all. -Molecular O₂ is required as a reactant to produce this substance.

The two nitrogen atoms in a urea molecule have as their biosynthetic source

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) Citric acid cycle intermediates are often the products from amino acid carbon skeleton degradation. (2) The net effect of transamination is to collect the amino groups from a variety of amino acids into the amino acids glutamate and aspartate. (3) All of the reactions of the urea cycle occur within mitochondria.

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) A reactant and a product in the first step of the urea cycle are, respectively, ornithine and citrulline. (2) Degradation of heme begins with a ring-opening reaction in which carbon monoxide is produced. (3) With a normal diet, only about 10 percent of our total calories come from protein.

Use the following to answer the questions below: For each of the heme degradation characterizations, select a correct degradation product from the response list. Responses may be used more than once or need not be used at all. -CO is produced at the same time as this substance.

A derivative of pyridoxine (vitamin B₆) is required as a coenzyme in

Use the following to answer the questions below: For each of the urea cycle characterizations, select a correct response from the response list. Responses may be used more than once or need not be used at all. -Is one of the standard amino acids

Carbon-containing amino acid degradation products can be converted to