Which of the following is NOT a role of coenzymes?A. Receiver or donor of hydrides in redox reactionsB. Receiver or donor of carboxyl groups in reactions that involve carboxyl grouptransfer.C. Receiver or donor of amino groups in transamination and deaminationreactions.D. Receiver or donor of alkyl, alkenyl, acyl, or formyl groups in transfer reactions.E. Receiver or donor of oxygen in oxygenation reactions.

Coenzymes: Coenzymes are small organic non-protein molecules that are loosely attached to…

Answered: Which of the following is NOT a role of…

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter4: How Cells Obtain Energy

Section: Chapter Questions

Problem 5RQ: Which of the following is not true about enzymes? a. They are consumed by the reactions they...

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a) What amino acid is metabolite 1? b) What kind of reaction occurs when 1 is converted to 2? c) What kind of enzyme performs the reaction converting 1 to 2? d) What biomolecule (a) is needed for the reaction to occur? e) What biomolecule (b) is produced in addition to 2? f) What happened to metabolite 3 when it was converted to 4? g) What kind of enzyme might perform the conversion of 3 to 4? h) What cofactor(s) would be required in the conversion of 3 to 4? i) What kind of reaction happens when 4 is converted to 5? j) What kind of reaction happens when 5 is converted to 6? k) What is the name of metabolite 7? l) What is the name of metabolite 8?
Which 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.
Which of the following describes a purpose for the function of phosphoglucoisomerase? a) allows for phosphorylation for trapping the molecule in the cell b)promotes substrate level phosphorylation and formation of ATP c) allows formation of a primary alcohol necessary for the next step of phosphorylation d)facilitates epimerization, the change in stereochemistry at one chiral carbon
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.
Trypsin catalyzes the cleavage of: a) all peptide bonds b) peptide bonds after Lys or Arg c) peptide bonds before Lys or Arg d) peptide bonds after Met Papain catalyzes the cleavage of: a) all peptide bonds b) peptide bonds after Lys or Arg c) peptide bonds before Lys or Arg d) peptide bonds after Met The molecule which binds to an enzyme and undergoes chemical reaction is called a: a) substrate b) cofactor c) coenzyme d) prosthetic group A metal ion which binds to an enzyme and assists it in catalysis is called: a) substrate b) cofactor c) coenzyme d) prosthetic group Proteases are a subclass of which larger class? A) isomerases b) oxidoreductases c) lyases d) hydrolases Transferases which catalyze the transfer of a phosphate group are called: a) lyases b) ligases c) kinases d) phosphatases
Which of the following statements about isozymes is correct? (Select all that apply.) (a) Isozymes allow reactions to be optimized under different conditions. (b) The main reason for isozymes is so that a given reaction is never completely inhibited. (c) Isozymes have completely different active sites. (d) Bind the same substrates but form different products. (e) Isozymes display different physical properties, such as kinetic parameters.
Which of the following best explains why enzyme catalysis is affected by a change in pH? A. Change in pH alters ionization states of serine in the active site involved in nucleophilic catalysis B. The ionization states of his, asp and glu involved in acid/base catalysis are altered with change in pH C. Change in pH alters ionization states of contact amino acids in the active site D. All enzymes have optimum pH
Lactose--->galactose+glucose represents an enzymatic reaction. What statement about this reaction is true? A) lactose is the enzyme of this reacrion B) galactose is the substance of this reaction C) this reaction is a type of exchange reaction D) this reaction is a type of decomposition (catabolic) reaction
Which of the following statements concerning enzymes is TRUE? a. Enzymes can increase the equilibrium constant of a reaction by 1000-fold. b. The activity of many enzymes can be regulated. c. Many enzymes are consumed in the reactions they catalyze. d. The rate of enzymatic catalysis is independent of pH.
Protein biosynthesis is best described as an example of: a) Catabolism b) Anabolism c) Decomposition reaction d) Exergonic reaction e) All of the above
Which of the following is not true about enzymes? a. They are consumed by the reactions they catalyze. b. They are usually made of amino acids. c. They lower the activation energy of chemical reactions. d. Each one is specific to the particular substrate(s) to which it binds.
PREDICT In the following reaction series, which enzyme(s) is/are most likely to have an allosteric site to which the end product E binds? (a) enzyme 1 (b) enzyme 2 (c) enzyme 3 (d) enzyme 4 (e) enzymes 3 and 4

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