Most enzyme-linked receptors affect the function of the target cell by A- genera

ID: 275526 • Letter: M

Question

Most enzyme-linked receptors affect the function of the target cell by

A- generating an action potential.

B- phosphorylating intracellular target proteins.

C- catalyzing synthesis of hormones in the cytoplasm.

D- facilitating the assembly of the cytoskeleton.

Which statement describes a possible outcome for a neurotransmitter after release into the synaptic cleft?

A- Reuptake into postsynaptic terminal via transporter proteins

B- Activation of G-protein-coupled receptor on postsynaptic cell

C- Modulation by an enzyme, increasing its efficiency

D- Activation of voltage-gated ion channel on presynaptic cell

Which of the following is not a catecholamine?

A- Histamine

B- Norepinephrine

C- Dopamine

D- All of the above are catecholamines

Peptide neurotransmitters are often released

A- more readily and quickly than nonpeptide transmitters

B- shortly after their synthesis in presynaptic terminals

C- as propeptides.

D- together with nonpeptide transmitters

Organophosphates inhibit the action of acetylcholinesterase. What effect does this have in the cell?

A- It prevents breakdown of ACh in the synapse causing increased activity at the postsynaptic cell

B- It prevents synthesis of ACh in the presynaptic terminal causing less neurotransmitter release

C- It prevents reuptake of ACh into the presynaptic terminal causing less neurotransmitter synthesis

D- It prevents binding of ACh on the postsynaptic cell causing less activity