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What is the result when lactose is present in the growth medium of yeast?
The organism synthesizes the enzymes required for lactose metabolism.
What are constituative enzymes?
Enzymes that are produced continuously, regardless of the chemical makeup of the environment.
What results from a negative control for gene expression?
Gene expression occurs unless it is shut off by some form of a regulator molecule.
What results from a positive control for gene regulation?
Transcription occurs only if a regulator molecule directly stimulates RNA production.
What affect does lactose have on gene regulation of lactose metabolism?
Gene expression is repressed when lactose is absent, but induced when it is available.
What role does lactose play in gene expression of lactose metabolism?
Lactose serves as an inducer.
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