Which Is an Experimental Means That Can Be Used to Distinguish

question 234

Multiple Choice

Which is an experimental means that can be used to distinguish between a signal transduction pathway that uses a cell membrane receptor and one that uses an intracellular receptor?

• A) Compare the ability of cells to respond to chemical signals that are similar in structure to the actual signal molecule.
• B) Observe whether stimulation of the signal transduction pathway by the signal molecule can be inhibited by another molecule.
• C) Incubate cells with a signal molecule containing the carbon-14 radioisotope and observe whether any carbon-14 enters cells.
• D) Quantify the number of cell membrane receptors present in a single cell and compare with cell membrane receptor numbers in other cell types.
• E) Determine whether the cell response involves a change in gene expression or a change in the activity of a cytosolic enzyme.