A Researcher Is Looking for Met^-strains

question 62

Multiple Choice

A researcher is looking for met^-strains. He compares two plates. One plate has colonies growing on complete medium. The other plate has colonies growing on methionine-deficient medium. How can the researcher determine which colonies are met^-?

• A) The colonies growing on the methionine-deficient plate are met^-.
• B) Colonies growing on the complete medium, but not on the methionine-deficient medium are met^-.
• C) More experiments must be performed to identify the met^-colonies.
• D) All of the colonies growing on the complete medium are met^-.
• E) Colonies growing on the methionine-deficient medium, but not on complete medium are met^-.

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Definitions:

Alkalinity

A measure of the capacity of water or any solution to neutralize acids, often associated with a pH level above 7, indicating a basic solution.

Molecular Formula

A notation that shows the number and type of atoms in a molecule, indicating the composition but not the structure of the molecule.

Hydrogen Atom

The simplest type of atom, consisting of one proton in the nucleus and one electron in orbit around it.

Oxygen Atom

A highly reactive element that is a key component of water and essential for cellular respiration in living organisms.