A Researcher Has Isolated a Protein Produced by a Snail

question 212

Multiple Choice

A researcher has isolated a protein produced by a snail and thought to be an intercellular chemical signaling agent.The researcher will incubate this agent with snail cells to test whether a specific cellular response occurs.What control should be run at the same time?

• A) Incubate normal snail cells with a solution that does not contain the signal protein.
• B) Incubate normal snail cells with a solution containing signal protein that has been chemically altered.
• C) Incubate normal snail cells with a solution that contains a signal protein other than the one being investigated.
• D) Incubate mutant snail cells known to be incapable of the cellular response with the signal protein.
• E) Incubate mutant snail cells that constantly carry out the cellular response with the signal protein.

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Definitions:

First Schemes

Early cognitive structures in Piaget’s theory of cognitive development, representing patterns of behavior or thinking that children use to explore and engage with the world.

Reflexes

Built-in reactions to stimuli.

Symbols

Objects, figures, or colors used to represent ideas, concepts, or other abstractions.

Habits

Regularly repeated behaviors that are often done subconsciously.