AP Biologymediummcq1 pt
How do phosphatases turn a signal off?
A.By removing phosphates that kinases added
B.By adding more phosphates
C.By destroying the receptor gene
D.By secreting the ligand
Explanation
Core Concept
Kinases add phosphate groups to target proteins, while phosphatases remove them. In many signaling pathways phosphorylation activates a component and dephosphorylation helps terminate or reset the signal, but the effect depends on the particular protein; dephosphorylation is not universally an 'off' switch.
Correct Answer
ABy removing phosphates that kinases added
More Unit 4: Cell Communication and Cell Cycle practice questions
- mediumWhich statement about the cell cycle's control system is correct?
- mediumA drug blocks adenylyl cyclase. Which signaling step is directly prevented?
- easyWhich type of molecule typically serves as the FIRST messenger?
- easyHow many daughter cells does one mitotic division produce?
- easyDensity-dependent inhibition refers to cells
Practice more AP Biology questions with full explanations
Practice Unit 4: Cell Communication and Cell Cycle Questions →