Exam 11: Cell Communication

Use this information to answer the following questions. Affinity chromatography is a method that can be used to purify cell-surface receptors, while they retain their hormone-binding ability. A ligand (hormone) for a receptor of interest is chemically linked to polystyrene beads. A solubilized preparation of membrane proteins is passed over a column containing these beads. Only the receptor binds to the beads. -This method of affinity chromatography would be expected to collect which of the following?

Use this description to answer the following questions. A major group of G protein-coupled receptors contains seven transmembrane α helices. The amino end of the protein lies at the exterior of the plasma membrane. Loops of amino acids connect the helices either at the exterior face or on the cytosol face of the membrane. The loop on the cytosol side between helices 5 and 6 is usually substantially longer than the others. -Where would you expect to find the carboxyl end?

The function of phosphatases in signal transduction is best described as to

An inhibitor of phosphodiesterase activity would have which of the following effects?

The activation of receptor tyrosine kinases is characterized by

The following questions are based on the figure below: -In the figure, the dots in the space between the two structures represent which of the following?

In general, a signal transmitted via phosphorylation of a series of proteins

In which of the following ways do plant hormones differ from hormones in animals?

Use this description to answer the following questions. A major group of G protein-coupled receptors contains seven transmembrane α helices. The amino end of the protein lies at the exterior of the plasma membrane. Loops of amino acids connect the helices either at the exterior face or on the cytosol face of the membrane. The loop on the cytosol side between helices 5 and 6 is usually substantially longer than the others. -The coupled G protein most likely interacts with this receptor