QQuestionBiochemistry
QuestionBiochemistry
which of the following statements about enzymes are true? Choose all that apply
a.) an enzyme yields a specific product, whereas a nonbiologival catalyst may produce more than one product, and side reactions may occur.
b.) generally, an enzyme is specific for a substrate. for example, thrombin catalyzes the hydrolysis of the peptide bond between Arg and Gly.
c.) a substrate must bind to the active site before a reaction occurs.
d.) reactions occur at the active site, which usually consists of a crevice on the surface of the enzyme
e.) nonbiological catalysts and enzymes tend to have a similar degree of reaction specificity.
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Answer
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Step 1:
The specificity of enzymes is one of their key characteristics. An enzyme yields a specific product, whereas a non-biological catalyst may produce more than one product, and side reactions may occur. (TRUE)
Step 2:
Enzymes are generally specific for a substrate. For example, thrombin catalyzes the hydrolysis of the peptide bond between Arg and Gly. This specificity allows enzymes to carry out specific reactions in the cell without interference from other molecules. (TRUE)
Step 3:
A substrate must bind to the active site before a reaction occurs. Enzymes have a unique three-dimensional shape that contains an active site, a pocket or groove where the substrate binds. The active site is where the reaction takes place, and it is specific to the substrate. Therefore, a substrate must bind to the active site before a reaction can occur. (TRUE)
Step 4:
Reactions occur at the active site, which usually consists of a crevice on the surface of the enzyme. This is where the substrate binds and where the reaction takes place. (TRUE)
Step 5:
Non-biological catalysts and enzymes tend to have a similar degree of reaction specificity. While both enzymes and non-biological catalysts increase the rate of reactions, enzymes are typically more specific than non-biological catalysts. Enzymes have a unique three-dimensional shape that is specific to the substrate, whereas non-biological catalysts may not have such a high degree of specificity. (FALSE)
Final Answer
a) TRUE b) TRUE c) TRUE d) TRUE e) FALSE
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