You are studying a metabolic pathway and are trying to decide if it is an anabolicpathway or a catabolic pathway. Which of the following would help diagnose thisproblem?A) Look for common intermediates.B) Look for ATP-requiring steps.C) Look for enzymes under allosteric regulation.OD) All of the above.OE) None of the above.

Catabolic pathways are those that can breakdown the larger compounds into simple molecules. Anabolic…

Answered: You are studying a metabolic pathway…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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2
Which class of macromolecules includes a majority of cellular enzymes? O nucleic acids proteins lipids O carbohydrates
Which of the following is true as it relates to the phosphorylation of enzymes? a) Phosphorylation of an enzyme changes its activity. b) Phosphates can be added to R groups of any amino acid. c) Phosphate groups are added by a class of enzymes known as kinases. d) a and c e) a, b and c
Predict the major product of each of the following reactions or series of reactions. In cases involving an ortho/para-directing substituent where two products would be obtained, draw the product resulting from para-substitution only..
Consider a hypothetical metabolic pathway involving four enzymes to convert molecule A into molecule E: Enz 1 Enz 2 C Enz 3 A O2) B Which molecule is most likely to be a feedback inhibitor that, when present in high concentrations, will reduce the flow of material through the pathway? 1) A 3) C 4) D B OS) E D 6) none of these Enz4 E
Which of the following are needed to convert fructose 6-phosphate to fructose 1,6-bisphosphate? a) Phosphofructokinase, ATP, and Mg2+ b) only phosphofructokinase c) Phosphofructokinase, ADP, and Mg2+ d) only phosphofructokinase and Mg2+
The figure below represents a reaction in the presence and absence of an enzyme catalyst. What can you conclude about this reaction? energy activation energy activation energy 1 uncatalysed reaction catalysed reaction A) It is endergonic in the absence of the enzyme. B) It will proceed more quickly in the presence of the enzyme. C) Once the reaction has reached equilibrium, there will be more product in the enzyme-catalyzed reaction. D) It has a negative AG. OE) Both B and D are true
As biological catalysts, enzymes play a fundamental role in many cellular processes. Which of the following statements about enzymes is correct? 1. Enzymes are essential for anabolic pathways; they are not required for catabolic pathways. 2. While an increase in temperature can increase the rate of an uncatalyzed reaction, it can’t increase the rate of an enzyme-catalyzed reaction. 3. Enzymes force substrates into unique conformations that do not occur in the absence of an enzyme. 4. Enzymes decrease the free energy of a reaction’s transition state. A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1, 2, 3 and 4 are correct
Which one of the following statements about the control of enzyme activity by phosphorylation is correct? a) Phosphorylation of an enzyme results in a conformational change b) Phosphorylation of an enzyme occurs only at specific tyrosine residues c) Phosphorylation of an enzyme is carried out by phosphoprotein phosphatases d) Enzyme control by phosphorylation is irreversible
Several of these reactions are energetically unfavorable and will only occur if coupled to a second, energetically favorable reaction? Circle the unfavorable reactions. a) Glucose + 02 → CO2 + H2O b) CO2 + H2O → glucose + 02 c) Nucleoside triphosphates → DNA d) Nucleotide bases → nucleoside triphosphates e) ADP + Pi → ATP
Q: Select the features of the structure and functioning of allosteric enzymes: a) are metabolic pathway limiting enzymes b) when interacting with ligands do not show a cooperative effect c) are monomeric proteins d) have spatially separated active and regulatory centers e) do not exhibit regulatory properties during dissociation of the molecule into protomers
Which of the following is an appropriate definition of zymogen? a) An inactive enzyme precursor b) A digestive enzyme c) A protease d) All of the above

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