

MCQOPTIONS
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1. |
When a __________ reaches its __________ , there is a specific means of receiving it and acting on the message. This task is the responsibility of specialized proteins called __________ . |
A. | signaling molecule; target cell; G proteins |
B. | signaling molecule; receptor; G proteins |
C. | kinase; receptor; proteases |
D. | signaling molecule; target cell; receptors |
Answer» E. | |