The Tryptophan Operon Is a Repressible Operon That Is

question 51

Multiple Choice

The tryptophan operon is a repressible operon that is

• A) permanently turned on.
• B) turned on only when tryptophan is present in the growth medium.
• C) turned off only when glucose is present in the growth medium.
• D) turned on only when glucose is present in the growth medium.
• E) turned off whenever tryptophan is added to the growth medium.

---

Definitions:

Private Philanthropy

Financial contributions or aid given by individuals or private organizations to support various causes and non-profit organizations.

Free-rider Problem

A situation where individuals benefit from resources, goods, or services without paying for them, leading to underprovision of those public goods.

Nonrivalry

A property of goods where one person's consumption does not prevent consumption by others, typically relevant in the context of public goods.

Nonexcludability

Nonexcludability is a feature of public goods where it is not possible to prevent individuals from consuming the good, irrespective of whether they have contributed to its provision.