Which Statement Is TRUE Regarding Class I Ribonucleotide Reductase?
A) $\beta$

question 53

Multiple Choice

Which statement is TRUE regarding Class I ribonucleotide reductase?

• A) The \(\beta\) subunit contains the regulatory sites for the enzyme.
• B) The \(\alpha\) subunit contains the active site cysteines.
• C) The \(\alpha\) subunit contains the binuclear iron center.
• D) This enzyme catalyzes a hydrolysis reaction.
• E) ATP is an inhibitor for most isoforms of this enzyme.

---

Definitions:

Markup

The difference between the cost of a good or service and its selling price, expressed as a percentage of cost.

Selling Price

The cost at which a good or service is made available for purchase to consumers.

Traceable Fixed Expense

Fixed costs that can be directly linked to a specific business segment or product line.

Net Operating Income

The profit a company makes from its operations, exclusive of taxes and other non-operational expenses.