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.
Related Questions
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
A researcher isolates an enzyme from a thermophilic bacterium and finds that its activity dramatically decreases when incubated at 25°C compared to its optimal temperature of 70°C. 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.
All the chemical reactions occurring in living organisms are called
Metabolism
Anabolism
Catabolism
Enzymatic
Which of the following statement(s) are/is correct?
I. In the process of metabolism, all organic biomolecules are constantly being broken down but not being built up through chemical reactions
II. A product of metabolism in called a metabolite, but not always
III. Metabolism is always known to built up new products
IV. Metabolism is the characteristic feature of non-living things
Only I and II are correct
Only III and IV are correct
I, II, III and IV are correct
None of the statements are correct
The chemical reactions which liberate energy by enzymatic oxidation of food stuffs to and , in the tissues are referred to as the
Energy metabolism
Respiratory metabolism
None of these
Both (a) and (b)
The most important form of energy currency in living organisms is the bond energy in the chemical called …..
Adenosine Triphosphate (ATP)
Adenosine Diphosphate (ADP)
Phosphate (P)
None of the above
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.
Metabolic pathways are often regulated through feedback inhibition. This means:
The substrate of a pathway stimulates the first enzyme.
Enzymes are constantly synthesized regardless of product concentration.
The end product of a pathway inhibits an earlier enzyme in the pathway.
Enzymes are degraded rapidly after catalyzing a reaction.
What is the primary role of enzymes in metabolism?
Provide energy for reactions
Transport substances across membranes
Catalyze metabolic reactions
Store genetic information
The process of converting complex molecules into simpler ones with the release of energy is known as:
Anabolism
Catabolism
Metabolism
Homeostasis
