The binding of ligands to many G-proteins linked receptors leads to shortlived increase in the concentration of certain intracellular signaling molecules called second messenger increase in the concentration of certain extracellular signaling molecules called first messenger decrease in the concentration of certain intracellular signaling molecules called second messenger decrease in the concentration of certain extracellular signaling molecules called first messenger TRUE ANSWER : ? YOUR ANSWER : ?
In vasodilation, proper nerve signals sent to blood vessels cause reduced blood pressure the release of nitric oxide from endothelial cells All of these relaxation of smooth muscle cells TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is true about a hydrophilic signaling molecule? It might trigger a signal cascade that causes some effect in a cell Its receptor is located in the cytosol of the target cell It is a steroid Since it can enter the cell, it directly affects some specific cell process TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following processes involve the combining of a message from one signaling molecule with that of another to either enhance or inhibit a cellular effect? Signal reception Signal transduction Signal integration Signal amplification TRUE ANSWER : ? YOUR ANSWER : ?
What is the name of the protein signaling molecule that alters glucose uptake, and where would its receptors be located? Insulin; beta cells of the pancreas NGF; the nerves involved in simple reflexes Insulin; many different cell types that use glucose for fuel PDGF; the blood TRUE ANSWER : ? YOUR ANSWER : ?
SH2 domains specifically bind to GDP phosphorylated tyrosine residues phosphorylated serine residues Ca2+ TRUE ANSWER : ? YOUR ANSWER : ?
In the signal transduction mechanism known as protein phosphorylation phosphorylated proteins act with enzymes to trigger the signal cascade All of these receptor kinases play a key role in triggering the signal cascade the signaling molecule binds to a surface receptor TRUE ANSWER : ? YOUR ANSWER : ?
Two key organizing principles for large multicellular organisms are communication between cells and simple nerve reflexes simple nerve reflexes and cell specialization cell specialization and communication between cells prokaryotic cell structure and cell specialization TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is a second messenger? Phospholipase C Both (a) and (b) Diacyl glycerol lnositol 1,4,5-triphosphate TRUE ANSWER : ? YOUR ANSWER : ?
The hormone or ligand can be considered as second messenger first messenger none of these both (a) and (b) TRUE ANSWER : ? YOUR ANSWER : ?