A Previously Unknown Chemical Signal Is Discovered in Mice

question 69

Multiple Choice

A previously unknown chemical signal is discovered in mice.Five observations about this signal are listed.Which observation would serve as evidence in distinguishing whether this chemical signal should be classified as a juxtacrine or a paracrine signal?

• A) The signal molecule is a protein.
• B) Cells responding to the signal have receptors specific to the signal.
• C) Cells producing the signal are not affected by the signal molecule.
• D) The signal molecule is not present in blood.
• E) The signal molecule is not present in extracellular fluid.

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Principal Portion

The part of a loan payment that reduces the outstanding balance of the loan, as opposed to the part that covers interest charges.

Contractual Obligation

A legally binding agreement between parties that specifies actions or non-actions that are required to be completed.

Pay Cash

The act of making a payment for goods or services with physical currency or through a cash equivalent transaction.