Which of the following statements is INCORRECT regarding the regulation of metabolic pathways?
Feedback inhibition involves the end-product of a pathway inhibiting an earlier enzyme.
Allosteric regulation exclusively involves the binding of molecules to the active site of an enzyme.
Covalent modification, like phosphorylation, can alter enzyme activity.
Enzyme compartmentalization within organelles can regulate metabolic flux.
Related Questions
Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these
Enhance oxidative metabolism
Are conjugated proteins
Are exclusively synthesized in the body of a living organism as at present
Help in regulating metabolism
In a metabolic pathway, enzyme A catalyzes the conversion of substrate X to intermediate Y. Enzyme B then catalyzes the conversion of Y to product Z. If a mutation in enzyme B renders it completely inactive, which of the following is MOST likely to occur?
Increased production of substrate X.
Accumulation of intermediate Y and depletion of product Z.
No change in the concentrations of X, Y, or Z.
Increased activity of enzyme A to compensate for the loss of enzyme B.
When a metabolic disequilibrium is in effect, then only cells continue to function
How do cells avoid reaching metabolic equilibrium?
Only cells that have reached metabolic equilibrium continue to function.
Only cells that avoid reaching metabolic equilibrium continue to function.
Metabolic equilibrium is essential for cell function.
Cells function optimally at metabolic equilibrium.
Which of the following best describes metabolism?
The process of breaking down food into simpler substances.
The process of building complex molecules from simpler ones.
The sum of all chemical reactions occurring within a living organism.
The process of energy production in cells.
A competitive inhibitor of an enzyme:
I. Increases the of the enzyme.
II. Decreases the of the enzyme.
III. Can be overcome by increasing substrate concentration.
IV. Binds to the allosteric site of the enzyme.
I and II only
II and IV only
I and III only
III and IV only
What is the starting point in the production of food?
Catabolism
Metabolism
Anabolism
Photosynthesis
Which process releases energy stored in glucose?
Photosynthesis
Protein synthesis
DNA replication
Cellular respiration
The term metabolism means
The sum of all the enzymatically catalysed chemical reactions constantly taking place in the cells and tissues of the living organisms
Processes that change the small molecules into larger ones
Processes that converts the large molecules into smaller ones
None of the above
The free energy of a system, in a spontaneous reaction
Decreases
Increases
Becomes equal to zero
Remains unchanged
A researcher isolates an enzyme from a thermophilic bacterium and finds that its activity dramatically decreases when incubated at 25ยฐC compared to its optimal temperature of 70ยฐC. This decrease in activity is MOST likely due to:
Increased substrate affinity at lower temperatures.
Changes in the enzyme's three-dimensional structure affecting the active site.
A decrease in the activation energy of the catalyzed reaction.
An increase in the concentration of competitive inhibitors at lower temperatures.
