Oxford University Press | Online Resource Centre

Choose your answers from a-d by clicking the radio button next to each choice and then press 'Submit' to get your score.

Hormones:

a) are secreted by exocrine glands.

b) act only on neighboring cells.

c) are always peptides.

d) are secreted into the blood.

Prostaglandins:

a) are secreted by exocytosis.

b) are blood-borne chemical signals.

c) re synthesized from membrane lipids.

d) activate nuclear receptors.

Hormone receptors:

a) have a high affinity for their natural ligand.

b) are always linked to G proteins.

c) are lipids.

d) are always located in the plasma membrane of their target cells.

G protein activation:

a) leads to changes in gene expression.

b) always causes an increase in cyclic AMP.

c) leads to the generation of second messengers.

d) always results in a decrease in cyclic AMP.

Steroid hormones such as aldosterone:

a) bind to nuclear receptors to regulate gene expression.

b) activate G protein cascades.

c) activate receptors on the cell membrane.

d) directly regulate protein synthesis.

Oxford University Press, Online Resource Centre, Chapter 05.