When E Coli Are Grown in a Medium with Low Levels

question 16

Multiple Choice

When E. coli are grown in a medium with low levels of lactose,

• A) all the enzymes of the lactose operon are present in very small quantities.
• B) all the enzymes of the lactose operon are present in large quantities.
• C) no enzymes of the lactose operon are present.
• D) \(\beta\)-galactosidase and permease are present in small quantities, but transacetylase is present in large quantities.
• E) the mRNA of the lactose operon is not present at all.

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Definitions:

Reinforce

To strengthen a behavior by providing a consequence that increases the likelihood of the behavior being repeated.

Avoidance Conditioning

A response that prevents the occurrence of a punisher. This increases the probability of a low-occurring response and maintains that response at a high level. The principle of avoidance conditioning states that a behavior will increase in frequency if it prevents a punisher from occurring.

Yelled At

The act of raising one’s voice in a sharp, often aggressive manner, typically as a form of reprimand or expression of frustration towards someone.

Party

A social gathering of invited guests, typically involving eating, drinking, entertainment, and often celebrating a specific occasion.