Question

which of the following are true of neurotransmitters?

each kind of neurotransmitter has a distinctive configuration that allows it to fit into a specific type of receptor site.
there are several types of neurotransmitters.
a neurotransmitter must fit precisely into a receptor site to make chemical communication possible.
all neurons are capable of receiving messages from any type of neurotransmitter.

Explanation:

1. For the first statement: Neurotransmitters have specific molecular structures (configurations) that match specific receptor sites (like a key - lock mechanism), so this is true.
2. For the second statement: There are many types of neurotransmitters (e.g., dopamine, serotonin, acetylcholine, etc.), so this is true.
3. For the third statement: The binding of a neurotransmitter to its receptor site is highly specific (precise fit) for chemical communication (neurotransmission) to occur, so this is true.
4. For the fourth statement: Neurons have specific receptors, so a neuron can only receive messages from neurotransmitters that match its receptors, not any type. So this is false.

Answer:

• Each kind of neurotransmitter has a distinctive configuration that allows it to fit into a specific type of receptor site. (True)
• There are several types of neurotransmitters. (True)
• A neurotransmitter must fit precisely into a receptor site to make chemical communication possible. (True)
• All neurons are capable of receiving messages from any type of neurotransmitter. (False)