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Ch. 5 Exercise


Arachidonic is the raw material for the synthesis of: a. amines b. thyroid hormones c. eicosanoids d. steroids e. peptides
Epinephrine is a(n): a. amino acid b. steroid c. eicosanoid d. adrenocorticoid e. catecholamine
Most chemical messengers fall into which of the following classes? a. amines b. amino acids c. peptide/proteins d. eicosanoids e. steroids
All amino acid chemical messengers function as: a. paracrines b. autocrines c. neurohormones d. neurotransmitters e. hormones
All steroid acid chemical messengers function as: a. paracrines b. autocrines c. neurohormones d. neurotransmitters e. hormones
Which of the following messenger classes bind to intracellular receptors? a. catecholamines only b. peptides only c. steroids only d. both catecholamines and steroids e. both peptides and steroids
The response of a target cell to a messenger depends on which of the following? a. concentration of messenger b. concentration of receptors on target cell c. affinity of the receptor for the messenger d. both a and c are true e. all of the above are
What enzyme catalyzes the synthesis of diacylglycerol? a. adenylate cyclase b. tyrosine kinase c. phosholipase C d. protein kinase e. phosphoprotein phosphatase
Cells that secrete a messenger are called _____________.
A (paracrine/autocrine) agent acts on the same cell that secretes it.
Endocrine glands release (neurotransmitter/hormones) into the _____________, where it travels to the target cell.
An active G protein releases the _________ subunit, which interacts with another membrane protein, altering it's activity.
The enzyme that catalyzes conversion of ATP to cAMP is called ____________.
Following activation of the phospatidylinositol system, (IP3/DAG) liberates calcium from intracellular stores.
(Lipophilic/Lipophobic) messengers exert their effect on target cells by activating or inactivating specific genes.
Examples of locally acting chemical messengers are (steroids/eicosanoids).
Cytosolic calcium often exerts its effects by binding to cytosolic (protein kinase C/calmodulin).
Lipophobic messengers are secreted by (exocytosis.diffusion across the cell membrane).
Amino acids are (hormones/neurotransmitters).
The (nervous system/endocrine system) is more rapid means of communication.
Created by: GracieLou



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