Concept explainers
Vitamin E is the name for a set of chemically related tocopherols, which are lipid
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Chapter 17 Solutions
GENETIC ANALYSIS: AN INTEG. APP. W/MAS
- An enzyme that catalyzes disulfide– sulfhydryl exchange reactions, called protein disulfide isomerase (PDI), has been isolated. PDI rapidly converts inactive scrambled ribonuclease into enzymatically active ribonuclease. In contrast, insulin is rapidly inactivated by PDI. What does this important observation imply about the relation between the amino acid sequence of insulin and its threedimensional structure?arrow_forwardWhich of the following statements are descriptions of metal ion catalysis or examples of metal ion catalysis? Choose all correct answers a Zn²+ cofactor may properly orient the substrate in the active site through ionic interactions. a covalent bond forms between enzyme and substrate lowers the energy or stabilizes the transition state or intermediate catalyst retains its original form after reaction occurs catalysts may participate in oxidation-reduction reactions by changes in the oxidation statearrow_forwardSome enzymes can be regulated by covalent modification, in which a group is covalently bonded to an amino acid side chain. Phosphorylation of side chains is a common regulatory covalent modification. In this essay, you will explore phosphorylation of side chains. Compare and contrast the types of interactions a free alcohol side chain such as serine could make with that of a phosphorylated alcohol such as phosphoserine (pSer). Could this modification affect the 3D structure of the protein? How? Imagine you are trying to separate a protein containing an unphosphorylated S residue from the same protein containing a pSer residue. Discuss how you could use ion-exchange chromatography to separate these two proteinsarrow_forward
- In order to metabolize lactose, most infants express the enzyme lactase in their intestines. What kind of glycosidic linkage does lactose have? Please draw the individual monosaccharides to explain your answer. Please explain how the monosaccharides in lactose will be used in glycolysis. Be specific.arrow_forwardFish living in environments such as the Arctic Ocean, wherewater temperatures are below the freezing point of theirblood, are able to survive because of so-called antifreezeglycoproteins. Suggest how these glycoproteins work.arrow_forwardIndividuals with phenylketonuria must avoid dietary phenylalanine because they are unable to convert phenylalanine to tyrosine. Look up this condition and find out what happens if phenylalanine accumulates in the body. Would you advise a person with phenylketonuria to consume foods sweetened with aspartame? Why or why not?arrow_forward
- α -Amylose is an unbranched glucose polymer. Why would this polymer not be as effective a storage form of glucose as glycogen?arrow_forwardDraw the structure of the a-keto acid formed by removal of the amino group during the catabolism of leucine. Note: Reference the Naturally-occurring amino acids table for additional information. Click and drag to start drawing a structure. 口:肚arrow_forwardThe cells that line the mammalian intestine produce glycoproteins with O-linked oligosaccharides. Some of the glycoproteins remain anchored to the cell surface and some are released into the intestinal space. In a healthy animal, numerous microbial species (the microbiome) live in the intestine. These organisms produce fucosidase, an enzyme that hydrolyzes glycosidic bonds involving fucose. (a) Why is this enzyme useful to the micro organisms? (b) Pathogenic (disease-causing) bacteria typically lack fucosidase. How does this help prevent the growth of pathogens in the intestine, particularly during an illness when the human host stops eating?arrow_forward
- List two classes of compounds derived from arachidonic acid. Suggest some reasons for the amount of biomedical research devoted to these compounds.arrow_forwardIf phenylalanine was not an essential amino acid, would diet therapy (the elimination of phenylalanine from the diet) for PKU work? Do not just say yes or no. Give a short explanation for this hypothetical situation.arrow_forwardTrue or Falsearrow_forward
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