The Tryptophan Operon in Some Bacteria Is a Repressible Operon

question 16

Multiple Choice

The tryptophan operon in some bacteria is a repressible operon.Which of the following statements correctly describes this operon?

• A)It is permanently active.
• B)It is activated only when tryptophan is present in the growth medium.
• C)It is activated only when glucose is present in the growth medium.
• D)It is deactivated whenever tryptophan is added to the growth medium.

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Definitions:

90-Day Note

A short-term debt obligation that is due for repayment within 90 days of the note's issuance.

Direct Write-Off Method

A method of accounting for bad debts that involves charging unpaid customer accounts directly to the income statement when they are determined to be uncollectible.

Accounting Equation

The fundamental equation that ensures the balance of a company's financial records: Assets = Liabilities + Equity.

Uncollectible Accounts

Accounts that are considered to be uncollectable due to the debtor being unlikely to pay, also known as bad debt.