Is the Lac Operon Transcribed When Lactose Is Present

question 1

Multiple Choice

Is the lac operon transcribed when lactose is present?  

• A) Yes, lactose is converted to another sugar that binds to the repressor, freeing the promoter region.
• B) Yes, lactose binds to RNA polymerase, allowing it to bind to the promoter and transcribe the operon.
• C) No, lactose is converted to another sugar that binds to the two operators preventing transcription.
• D) No, lactose has no effect on transcription of the lac operon.
• E) No, lactose binds to the second operator, blocking transcription by RNA polymerase.

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Definitions:

Red Blood Cells

The cells in the blood that carry oxygen from the lungs to the body tissues and carbon dioxide back to the lungs.

White Blood Cells

Cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.

Mucin

A protein component of mucus, which helps to protect and lubricate surfaces.

Simple Columnar Cells

A type of epithelial cell that is column-shaped and designed to absorb or secrete substances, commonly found in the digestive tract and uterus.