Exam 15: Cell Signaling and Signal Transduction: Communication Between Cells

Ora1 is a tetrameric _______ that has been identified as being involved in a particular type of inherited human immune deficiency that results from a lack of Ca2+ stores in ________.

How is signaling by an activated G _$\alpha$ subunit terminated?

In order to begin desensitization,the ________ domain of the activated G protein-coupled receptor is phosphorylated by a specific enzyme called a(n)________.

The concentration of calcium ions in the ER lumen,the plant cell vacuole and the extracellular space are on average more than _______ times higher than in the cytosol.

Which molecule below does not act as a neurotransmitter and a hormone?

GRKs are a small family of ________ protein kinases,most of which are localized to the _______ surface of the plasma membrane.

Conformational shift in the  subunit of the G protein

What is the largest protein superfamily encoded by animal genomes?

From what molecule are the steroids derived?

Which of the following features would be a requirement for a receptor that exhibits ligand-mediated dimerization?

What phosphorylates the tyrosine residues found on docking proteins?

What stimulus triggered by the binding of acetylcholine then activates nitric oxide synthase?

_________ are enzymes that phosphorylate specific tyrosine residues on protein substrates.

What group of enzymes phosphorylates most of the carbons on inositol?

What kind of enzyme is the RAS gene product,the Ras protein?

A family of proteins homologous to the products of the CED-3 gene in C.elegans has been discovered in mammals.What is this family of proteins called?

How many high-affinity sweet-taste receptors have been identified?

What agent made by endothelial cells makes blood vessel smooth muscle cells relax?

Once the kinase domain of receptor protein-tyrosine kinase has been activated,what does the activated receptor protein-tyrosine kinase do?

Viruses that carry their genetic information in the form of RNA are called ________.