The coenzyme pyridoxal phosphate (PLP) in its active form has all the following characteristics except: It is covalently bonded to its enzyme. It possesses a phosphate group. It bonds to an amine group by means of the phosphate group. All of these characteristics are true. All of these characteristics are false.
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- Which one of the following statements about coenzyme Q is not true? a. coenzyme Q is lipid-soluble b. coenzyme Q can accept one or two electrons c. conenzyme Q often diffuses in the membrane from one protein complex to another in its semiquinone form d. Coenzyme Q is one of the five electron carriers used in the electron transport chainWhich of the following statement regarding coenzyme A is incorrect? a) The B vitamin pantothenic acid is present as a subunit of its structure. b) Its main biochemical function is to transfer acetyl groups. c) Its structure contains a phosphorylated ADP.. d) The B vitamin pantothenic acid is the “active” subunit of the coenzyme A.label all the carbon atoms in glutamine (1-5) and nitrogen (1-2) and show how the molecule is metabolized, which enzymes and cofactors are needed to do so and what metabolic pathway do their products lead into?
- all dehydrogenase reactions are variations upon a theme. Within that set of reactions, all reactions involving NAD+ are variations on a theme. Within that set of reactions, all reactions involving decarboxylation are variations on a theme; oxidative deamination is a variation on the theme of oxidative decarboxylation.An organic cofactor (usually derived from a vitamin or a nucleotide), which is tightly attached to the enzyme (like FAD when used by the Krebs cycle enzyme succinate dehydrogenase), is always called: the metalloenzyme the metal-activated enzyme the holoenzyme the prosthetic group the cosubstrateWhich of the following statements are true?For each, explain why or why not.(a) All coenzymes are electron-transfer agents.(b) Coenzymes do not contain phosphorus or sulfur.(c) Generating ATP is a way of storing energy.
- Which of the following best describes a coenzyme? Small charged ions like Fe2+ that help an enzyme to do its job Larger molecules like vitamin D that help an enzyme to do its job A source of energy needed to power an energy-requiring chemical reaction Another name for the substrates that an enzyme will act upon Products made from an enzyme-catalyzed reactionWhen the enzyme hexokinase binds to glucose and ATP it undergoes a conformational change. All of the following are true about this enzyme-substrate binding EXCEPT: The active site changes shape so that it binds more tightly to the substrates The substrates are optimally positioned for the reaction to occur The substrates become contorted or strained, which increases their reactivity The activation energy of the reaction increasesWhich of the following doesn’t occur in the transition reaction? Pyruvic acid is oxidized Pyruvic acid is decarboxylated Pyruvic acid is reduced Acetic acid attaches to coenzyme A to form Acetyl CoA
- Which of the following statements are true? For each, explain why or why not. (a) All coenzymes are electrontransfer agents. (b) Coenzymes do not contain phosphorus or sulfur. (c) Generating ATP is a way of storing energy.All of the following classes of enzymes catalyze the Fatty acid synthesis except a. synthetase b. Synthase c. Carboxylase d. DehydrgenWhat general kinds of reactions do the following types of enzymes catalyze?(a) Dehydrogenases (b) Decarboxylases(c) Lipases