18 Questions
Which type of specificity refers to an enzyme acting on only one substrate?
Absolute specificity
Which type of specificity involves enzymes acting on specific bonds or linkages?
Bond specificity
Enzyme activity can be regulated to respond to cellular needs. Which characteristic does this exemplify?
Rate-limiting step control
What term is used to describe the collective term for coenzymes and cofactors that are essential for enzyme function?
Prosthetic group
Which term describes an enzyme with its required prosthetic group or coenzyme attached?
Holoenzyme
Compartmentalization of enzymes within specific organelles serves which purpose?
Isolating reactions from competing reactions
What term is used to describe the non-protein part that is tightly bound to the apoenzyme and is difficult to remove without damaging the enzyme?
Prosthetic group
Which of the following best describes isozymes (isozymes)?
Enzymes with similar catalytic activity but different characteristics
What sets the pace for the entire enzymatic reaction, as it is usually the slowest step?
Rate limiting step
Which term refers to the fully active form of an enzyme consisting of both the protein part and its bound cofactor/prosthetic group?
Holoenzyme
In an enzymatic reaction, what is a coenzyme?
An organic molecule that aids enzyme function by carrying chemical groups
What primarily constitutes an apoenzyme?
The protein part of an enzyme without its cofactor/prosthetic group
What is the main difference between holoenzymes and apoenzymes?
Holoenzymes have both protein and non-protein components, while apoenzymes are made up of only protein molecules.
Which of the following is a characteristic of coenzymes in enzymes?
Coenzymes are organic molecules that facilitate enzyme function by carrying chemical groups between enzymes.
What role do cofactors play in enzyme function?
Cofactors stabilize the conformation of enzymes but do not directly participate in catalysis.
What is the significance of isozymes in metabolic reactions?
Isozymes increase the diversity of enzymes in cells, allowing for fine-tuning of metabolic processes.
In enzymatic reactions, what is the function of a prosthetic group?
Prosthetic groups bind covalently to the apoenzyme and participate directly in catalysis.
Which statement accurately describes the concept of rate-limiting steps in metabolic reactions?
Rate-limiting steps determine the overall rate of a metabolic pathway by being the slowest step in the sequence of reactions.
Learn about the tight binding of non-protein parts to apoenzymes known as prosthetic groups and the concept of isoenzymes which have similar catalytic activities but differ in physical and chemical characteristics. An example of isoenzymes is LDH (Lactate dehydrogenase).
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