Identify and describe the chemical change in the lyase-catalyzed reaction in Table 19.4 that involves fumarate and malate. Identify the substrate(s) and product(s). <IMAGE>

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Textbook Question

Answer questions (a)–(e) concerning the following reaction:

<IMAGE>

a. The enzyme involved in this reaction belongs to what class of enzymes?

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Textbook Question

The meat tenderizer used in cooking is primarily papain, a protease enzyme isolated from the fruit of the papaya tree. Why do you suppose papain is so effective at tenderizing meat?

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Textbook Question

The reaction that follows is catalyzed by isocitrate dehydrogenase and occurs in two steps, the first of which (step A) is formation of an unstable intermediates (shown in brackets).

<IMAGE>

d. To what class of enzymes does isocitrate dehydrogenase, the enzyme that catalyzes this reaction, belong?

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Textbook Question

Serotonin is a monoamine neurotransmitter. It is formed in the body from the amino acid tryptophan (Figure 28.6, p. 836). What class of enzyme catalyzes each of the two steps that convert tryptophan to serotonin?

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Textbook Question

What is the reactant for each of the following enzymes?

a. galactase

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Textbook Question

What is the name of the class of enzymes that would catalyze each of the following reactions?

c. converting glucose (C₆H₁₂O₆) to fructose (C₆H₁₂O₆).

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Textbook Question

What is the name of the class of enzymes that would catalyze each of the following reactions?

a. addition of water to a double bond

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Textbook Question

Ethylene glycol (HO—CH₂—CH₂—OH) is a major component of antifreeze. If ingested, it is first converted to HOOC—CHO (oxoethanoic acid) and then to HOOC—COOH (oxalic acid), which is toxic. (16.4, 16.5).

<IMAGE>

a. What class of enzyme catalyzes the reactions described?

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Textbook Question

Adults who are lactose intolerant cannot break down the disaccharide in milk products. To help digest dairy food, a product known as Lactaid can be added to milk and the milk then refrigerated for 24 hours. (16.4, 16.5)

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a. What enzyme is present in Lactaid, and what is the major class of this enzyme?

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Textbook Question

Indicate whether each of the following would be a substrate (S) or an enzyme (E): (16.4)

a. glucose

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Textbook Question

Give the substrate of each of the following enzymes: (16.4)

a. urease

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Textbook Question

Give the substrate of each of the following enzymes: (16.4)

a. maltase

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Textbook Question

Does each of the following statements describe a simple enzyme (no cofactor or coenzyme necessary), an enzyme that requires a cofactor, or an enzyme that requires a coenzyme?

b. consists of one polypeptide chain in its active form

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Textbook Question

Does each of the following statements describe a simple enzyme (no cofactor or coenzyme necessary), an enzyme that requires a cofactor, or an enzyme that requires a coenzyme?

c. contains vitamin B₆ in its active site

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Multiple Choice

Which of the following could be the possible name of enzyme that involves the transference of a phosphate group between substrates?

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Multiple Choice

Which of the following enzyme name and function is incorrectly matched?

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Multiple Choice

Identify the class and subclass of an enzyme that catalyzes the following reaction.

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