All of the following statements about chemically-gated ion channels are true except
A) their amino acid chains wind back and forth across the membrane.
B) they close in response to binding of the signal molecule.
C) a pore exists in the center of the protein.
D) the pore connects the extracellular fluid with the cytoplasm.
E) the pore is big enough for ions to pass through it.
Correct Answer:
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Q1: Enzymatic receptors typically activate intracellular proteins by
Q2: A small number of surface receptors can
Q4: Adjacent cells can signal others by direct
Q5: Endocrine signaling involves the release of _.
A)neurotransmitters
B)hormones
C)peptides
D)cells
Q6: Hormones are an example of intercellular communication
Q7: Tight and anchoring _ cause cells to
Q8: Synaptic signaling requires which of the following
Q9: Signals with short-lived,local effects are called
A)direct contact.
B)endocrine
Q10: The molecules that convert extracellular signals into
Q11: Chemically-gated ion _ open or close when
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