CELL STRUCTURE AND COMPARTMENTS QUIZ

phosphokinase C

lipokinase

phosphodiesterase C

phospholipase C

None of these

target cells distant from its site of synthesis in cells of an endocrine organ

both (a) and (b)

target cells close to the cell from which it was secreted

None of these

ATP and GTP by the actions of guanylate cyclase and adenylate cyclase respectively

ATP and GTP by the actions of adenylate cyclase and guanylate cyclase respectively

GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively

Adrenaline

Progesterone

Growth factors

Nitric oxide

Because nitric oxide breaks down quickly and thus cannot travel far

Because other body tissues use a different signaling molecule

Because nitric oxide cannot cross cell membranes and enter the blood

None of these

They prevent the production of key signaling molecules

They destroy the receptors for key signaling molecules

They alter the chemical structure of key signaling molecules

They block the normal functioning of signal transduction mechanisms

decrease in the concentration of certain extracellular signaling molecules called first messenger

increase in the concentration of certain extracellular signaling molecules called first messenger

increase in the concentration of certain intracellular signaling molecules called second messenger

decrease in the concentration of certain intracellular signaling molecules called second messenger

breaks down into nitric oxide, which increases blood flow to the heart

interferes with chemical cascades that trigger contraction of heart muscle

is broken down into hormones that affect the heart

mimics the action of signal receptors

Adenylate cyclase

Thyroxin

Insulin

Testosterone

Signal transduction

Signal integration

Signal amplification

Signal reception