Signaling Molecules Can Be "Tagged" by Attaching Glow-In-The-Dark Molecules to Them

question 53

Multiple Choice

Signaling molecules can be "tagged" by attaching glow-in-the-dark molecules to them. After adding tagged signaling molecules to the fluid around several cells, you observe the cells with a microscope designed to see glow-in-the-dark molecules. After a few minutes, you notice that the plasma membrane of some of the cells begins to glow. This observation indicates that some cells

• A)have more dense plasma membranes than others.
• B)have receptors for the signaling molecule.
• C)have no active carrier proteins for the signaling molecules.
• D)block the signaling molecules by repelling them.

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Definitions:

Exchange Rates

The value of one currency for the purpose of conversion to another, impacting international trade and investment.

Absolute Purchasing Power Parity

A hypothesis positing that when there are no transportation or transaction expenses, the same products in various nations ought to be priced equally if priced in the same currency.

Exchange Rate

The worth of one currency in relation to another for conversion purposes, specifying the amount of one currency that can be exchanged for another.