18 Questions
What is the substrate concentration at the maximal velocity of an enzyme-catalyzed reaction?
Half the maximal velocity of the reaction
Uncompetitive reversible inhibition of an enzyme results from inhibitor binding to which of the following?
The free enzyme and the enzyme-substrate complex
In a plot of 1/V against 1/[S] for an enzyme-catalyzed reaction, what does the presence of a competitive inhibitor alter?
The intercept on the 1/[S] axis
What is the overall ΔG'° for the two successive reactions converting glucose 1-phosphate to fructose 6-phosphate?
-5.4 kJ/mol
Where and under what conditions is acetyl-CoA produced from pyruvate?
The mitochondria, only under aerobic conditions
What is true about the glycolytic pathway?
Endergonic reactions are all driven forward by being coupled to exergonic reactions
What is the primary function of glycogen phosphorylase in the mobilization of glucose from glycogen?
Release free glucose 1-phosphate molecules
What is a characteristic of the reaction that converts pyruvate to acetyl-CoA and CO2?
It involves the participation of thiamine
Where are triacylglycerols acted upon during the digestion and absorption of dietary lipids?
In the small intestine by the action of lipases
What happens to glucose 6-phosphate in the liver?
It is dephosphorylated to maintain blood glucose levels
How many NADH molecules are produced per glucose molecule during glycolysis?
Two
What is produced from the addition of inorganic phosphate to ADP during ATP production?
ATP
What is a characteristic of oligomeric proteins?
They can further associate into large fibres
Which of the following is a type of protein found in red blood cells?
Oxygen transport protein found in red blood cells
What is the role of enzyme catalysts in biochemical reactions?
To lower the activation energy for the conversion of substrate to product
What is a characteristic of allosteric enzymes?
Their activity is not influenced by modulators
What is the Vmax for an enzyme catalysed reaction?
The maximal velocity of an enzyme catalysed reaction
What is a characteristic of a subunit in a protein?
It may have non-protein prosthetic groups
Test your understanding of enzyme kinetics and inhibition mechanisms, including substrate concentration, reversible inhibition, and competitive inhibitors. Evaluate your knowledge of enzyme-substrate interactions and their effects on reaction rates.
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