What Is the Most Expected Effect of a Deletion Mutation

question 20

Multiple Choice

What is the most expected effect of a deletion mutation covering the promoter sequence of the lactose operon?

• A) Loss of catabolite repression of beta-galactosidase.
• B) Loss of transcription of the beta-galactosidase gene in the presence of lactose.
• C) Transcription of the beta-galactosidase gene in the absence of lactose.
• D) Transcription of the beta-galactosidase gene only in the presence of high levels of lactose.
• E) Constitutive synthesis of beta-galactosidase in an F' merodiploid.

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Definitions:

Seafloor Spreading

The process by which new oceanic crust is created at mid-ocean ridges as tectonic plates diverge, leading to the gradual widening of an ocean basin.

Glaciers

Slow-moving rivers of ice formed by the accumulation and compaction of snow on mountains or near poles, which shape the land through erosion.

Sea Level

The average height of the ocean's surface between the high and low tide, used as a standard in reckoning land elevation or sea depths.

Ice Block

A large piece of ice, typically extracted from an ice field or frozen body of water.