AP Bio Unit 4.1 Quiz: Cellular Communication & Feedback Loops

Analyze the following scenario: A cell receives a signal to divide, but the phosphatases in the cell are malformed and nonfunctional. What is the most likely consequence?

• The cell will divide uncontrollably

• The cell will not divide

• The cell will undergo apoptosis

• The cell will differentiate into another cell type

Tags

NGSS.HS-LS1-4

In a negative feedback loop, what is the role of the effector?

• To detect changes in the environment

• To amplify the initial stimulus

• To counteract the initial stimulus

• To transmit the signal to the brain

Tags

NGSS.HS-LS1-3

Which molecule is most likely to act as a second messenger in a signal transduction pathway?

• ATP

• cAMP

• DNA

• RNA

What kind of systems are G-protein coupled receptor (GPCR) used for in animals?

• GPCRs are primarily involved in muscle contraction and digestion.
• GPCRs are used exclusively for cellular energy production.
• GPCRs are responsible for the synthesis of hormones in plants.
• GPCRs are used for sensory perception, immune responses, and regulation of mood and behavior in animals.

Identify the correct sequence of events in a typical signal transduction pathway.

• Signal reception, signal transduction, cellular response

• Cellular response, signal reception, signal transduction

• Signal transduction, signal reception, cellular response

• Cellular response, signal transduction, signal reception

Tags

NGSS.HS-LS2-3

In a signal transduction pathway, what role does a second messenger play?

• It directly binds to the receptor

• It amplifies the signal within the cell

• It deactivates the receptor

• It transports the signal outside the cell

Evaluate the effectiveness of a signal transduction pathway that results in the production of a protein. What would be a sign of an effective pathway?

• The protein is produced in excess

• The protein is produced in the correct amount and at the right time

• The protein is not produced at all

• The protein is produced but is non-functional

If a ligand-gated ion channel has a mutation that causes it to function improperly, what effect would this have on the cell's electrochemical gradient?

• The cell's electrochemical gradient would be disrupted.
• The cell would become hyperpolarized.
• The cell's electrochemical gradient would remain unchanged.
• The cell's electrochemical gradient would strengthen.

Which of the following is an example of local signaling?

• Hormones released into the bloodstream

• Neurotransmitters released at a synapse

• Direct contact through gap junctions

• Autocrine signaling within the same cell

In the context of cellular communication, what is the primary role of a receptor?

• To degrade signaling molecules

• To bind signaling molecules and initiate a response

• To transport signaling molecules across the membrane

• To synthesize signaling molecules

Tags

NGSS.HS-LS2-3