题目内容

Majority of the water soluble signal molecules bind to specific sites on the receptor proteins that are embedded into the plasma membrane. A receptor transmits information from the environment to the inside of the cell by changing shape or when binding to a specific ligand, or the molecule that specifically binds to another molecule, binds to it. Which of the following is not one of the three major types of membrane receptors?

A. ion channel receptors
B. G-protein-linked receptors
C. active receptor relay proteins
D. receptor tyrosine kinases

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There are three stages of cellular communication. They are reception, transduction, and response. During which stage are the signal molecules binding to proteins in the cell membrane causing the protein to change shape?

A. reception and response
B. transduction
C. response
D. reception

There are two major participants in every cell communication activity. The one that is giving communication, and the one that receives communication. Some also communicate through direct and indirect contact, which is also called local and long-distance signaling. Which of the following is an example of long-distance signaling occurring in the body?

A. paracrine signaling
B. systematic signaling
C. synaptic signaling
D. hormonal signaling

An example of a nuclear response is

A. epinephrine.
B. amplification.
C. growth factors.
D. termination of signal.

Endocrine signals are transmitted more slowly than paracrine signals because

A. the ligands are transported through the bloodstream and travel greater distances.
B. the target and signaling cells are close together.
C. the ligands are degraded rapidly.
D. the ligands don't bind to carrier proteins during transport.

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