Fifteen Different Strains of Bacteria Are Auxotrophic for Maltose and Their

question 33

Multiple Choice

Fifteen different strains of bacteria are auxotrophic for maltose and their mutations do not complement each other.The mutations in these bacteria map to the same DNA region using transformation of random fragments of genomic DNA.Only two different enzymes participate in the maltose biosynthetic pathway, and the genes for both are within a single operon.What does this data suggest?

• A)There are fifteen enzymes in maltose metabolism.
• B)All the strains have mutations that prevent transcription of the operon.
• C)Fifteen genes encode maltose biosynthesis enzymes, but only two genes are crucial.
• D)Maltose is the preferred sugar source for the mutant bacteria.

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Definitions:

Fold and Thrust Belt

A series of mountainous folds and fault-driven compressions in the Earth's crust, typically found at convergent tectonic plate boundaries.

Magmas

Molten rock beneath or within the Earth's crust, from which igneous rocks are formed.

Ocean-Continent Convergence

A type of plate boundary where a continental plate and oceanic plate collide, often resulting in volcanic activity and mountain building.

Fold and Thrust Belt

A series of mountainous folds and thrust faults created by the compression of the earth's crust.