Cell Signalling and Transduction
The signaling molecules called steroid hormones

never enter the blood of humans
are made in one location of the body but have their effects some distance away
bind to cell surface receptors to trigger chemical cascades
are hydrophilic and so cannot penetrate the plasma membrane

ANSWER DOWNLOAD EXAMIANS APP

Cell Signalling and Transduction
When a __________ reaches its __________ , there is a specific means of receiving it and acting on the message. This task is the responsibility of specialized proteins called __________ .

signaling molecule; receptor; G proteins
signaling molecule; target cell; receptors
signaling molecule; target cell; G proteins
kinase; receptor; proteases

ANSWER DOWNLOAD EXAMIANS APP

Cell Signalling and Transduction
A signal cascade induced by adrenaline or thyroxine

results in the activation of a sequence of enzymes needed for the cell effect
must begin with receipt of the signal molecule by a surface receptor
All of these
involves the activation of a G protein

ANSWER DOWNLOAD EXAMIANS APP

Cell Signalling and Transduction
cAMP and cGMP are derived from

None of these
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
ATP and GTP by the actions of guanylate cyclase and adenylate cyclase respectively

ANSWER DOWNLOAD EXAMIANS APP