2. Cell Biology

Cell Communication — Quiz

Test your understanding of cell communication with 5 practice questions.

Practice Questions

Question 1

When a signaling molecule secreted by a cell binds to receptors on that same cell and induces a response, this modality is termed:

Question 2

Which receptor type directly dimerizes upon ligand binding and possesses intrinsic tyrosine kinase activity?

Question 3

If a phosphodiesterase inhibitor is applied to a cell with active GPCR–cAMP signaling, what immediate effect is expected on PKA activity?

Question 4

Overexpression of a protein tyrosine phosphatase in a cell will most likely cause which effect on an RTK‐MAPK pathway?

Question 5

In a GPCR pathway, one ligand–receptor complex activates 5 G proteins, each G protein then activates 50 adenylyl cyclase molecules, and each cyclase produces 100 cAMP molecules. How many cAMP molecules result from one ligand binding?