Quiz 5 Flashcards
Why is reduction the term used to describe the gain of an electron?
The electron acceptor’s net charge decreases.
Which of the following statements regarding competitive inhibitors is true?
Competitive inhibitors decrease the rate of enzyme activity.
If high amounts of sulfanilamide are in the presence of an enzyme whose substrate is PABA, what outcome is expected?
PABA will not be catalyzed.
What is meant by the statement “Enzymes are biological catalysts”?
Enzymes speed up the chemical reactions in living cells.
What enables competitive inhibitors to bind to a specific enzyme?
Competitive inhibitors have structures that resemble the enzyme’s substrate.
Which of the following statements regarding redox reactions is true?
- Redox reactions must either be oxidizing reactions or reducing reactions.
- Redox reactions are only seen in the electron transport chain.
- No metabolic reactions are redox reactions.
- Redox reactions involve an oxidation reaction coupled with a reduction reaction.
Redox reactions involve an oxidation reaction coupled with a reduction reaction.
During an oxidation reaction,
the donor molecule loses an electron and becomes oxidized.
Why do all enzymatic reactions need activation energy?
Energy is required to disrupt a substrate’s stable electron configuration.
How does a competitive inhibitor slow enzyme catalysis?
They compete with the substrate for the enzyme’s active site.
Why are enzymes important to biological systems?
Enzymes decrease the amount of activation energy required for chemical reactions to occur.
A reaction that involves the transfer of electrons from one molecule to another is referred to as
a redox reaction.
