A researcher is studying a genetic switch in a new species of bacteria. She noti

Question

A researcher is studying a genetic switch in a new species of bacteria. She notices that, in order for a gene of interest to be transcribed, an activator must be bound to a region upstream of the promoter. This is an example of

A) Negative regulation

B) Positive regulation

C) Neutral regulation

D) Misregulation

E) A gene that is not regulated in any way

A researcher has just ordered a large quantity of a small molecule from a company. The researcher will treat bacteria with this molecule, which will bind to a specific activator protein, thus changing its shape and resulting in transcription of a target gene. This small molecule is a(n)

A) Activator

B) Repressor

C) Allosteric effector

D) Promoter

E) Operon

A researcher is interested in gene transcription in E. coli, and she is studying the promoter and operator regions of a specific gene. When it comes to proteins, ____________ will bind to the promoter, and ___________ will bind to the operator of her gene of interest.

A) RNA polymerase; a repressor

B) A repressor; RNA polymerase

C) RNA polymerase; ribosome

D) A repressor; an activator

E) An activator; an allosteric effector

A researcher is studying two types of chromatin. The first type is “open” or loosely packed, and would be referred to as __________. The second type is “closed” and tightly packed, and would be considered _______________.

A) Constitutive heterochromatin; non-constitutive heterochromatin

B) Heterochromatin; euchromatin

C) Euchromatin; heterochromatin

D) Promoter-proximal elements; enhancers

E) Enhancers; promoter-proximal elements

Explanation / Answer

1). Positive regulation.(B).

2). Allosteric effector (C).

3). RNA polymerase; repressor (A).

4). Euchromatin; heterochromatin (C).

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.