AP Bio Unit 4: Signal Transduction Pathways Quiz

Explain how the analogy of Jimi Hendrix playing the guitar relates to signal transduction pathways in cells. What are the key components in both scenarios that facilitate the transmission and amplification of signals?

• The guitar strings and the cell membrane both act as barriers to signal transmission.

• The electric pickup and the receptor both convert external signals into internal messages.

• The amplifier and the phosphorylation cascade both reduce the signal strength.

• The guitar strings and the ligand both directly enter the cell to transmit signals.

Describe the role of the G-protein in the signal transduction pathway. How does its structure facilitate its function?

• The G-protein acts as a barrier to prevent signal transmission.

• The G-protein's snaky structure allows it to move freely within the cell.

• The G-protein's subunits allow it to change shape and activate other proteins.

• The G-protein directly releases glucose from glycogen.

Analyze the process by which ATP is converted to cyclic AMP (cAMP) in the signal transduction pathway. What is the significance of this conversion?

• ATP is converted to cAMP to store energy for later use.

• ATP is converted to cAMP to amplify the signal within the cell.

• ATP is converted to cAMP to deactivate the signal transduction pathway.

• ATP is converted to cAMP to directly release glucose from glycogen.

Tags

NGSS.HS-LS1-3

Evaluate the role of protein kinase in the signal transduction pathway. How does its activation lead to the release of glucose from glycogen?

• Protein kinase directly breaks down glycogen into glucose.

• Protein kinase activates phosphorylase, which then releases glucose from glycogen.

• Protein kinase deactivates the G-protein, stopping the signal.

• Protein kinase stores glucose for future use.

Discuss the importance of secondary messengers like cAMP in the signal transduction pathway. How do they contribute to the amplification of the signal?

• Secondary messengers like cAMP reduce the signal strength.

• Secondary messengers like cAMP are not involved in signal amplification.

• Secondary messengers like cAMP increase the number of active protein kinases.

• Secondary messengers like cAMP directly release glucose from glycogen.

Tags

NGSS.HS-LS1-3

How does the conformational change in the G-protein receptor upon ligand binding initiate the signal transduction pathway?

• It causes the receptor to release glucose directly.

• It activates the alpha subunit, which then activates adenylyl cyclase.

• It deactivates the receptor, stopping the signal.

• It causes the receptor to bind directly to glycogen.

What is the role of adenylyl cyclase in the signal transduction pathway, and how does it contribute to the production of cAMP?

• Adenylyl cyclase stores ATP for future use.

• Adenylyl cyclase converts ATP to cAMP, initiating the signal amplification.

• Adenylyl cyclase directly releases glucose from glycogen.

• Adenylyl cyclase deactivates the G-protein.

Explain the process of phosphorylation in the signal transduction pathway. How does it lead to the activation of enzymes within the cell?

• Phosphorylation deactivates enzymes, stopping the signal.

• Phosphorylation adds a phosphate group, activating enzymes like phosphorylase.

• Phosphorylation removes energy from ATP, deactivating the signal.

• Phosphorylation directly releases glucose from glycogen.

How does the signal transduction pathway ensure that the signal is amplified within the cell, even if only a small amount of ligand is present?

• By reducing the number of active protein kinases.

• By increasing the number of cAMP molecules, which activate multiple protein kinases.

• By directly releasing glucose from glycogen.

• By deactivating the G-protein receptor.

What happens to the signal transduction pathway when the ligand is no longer attached to the receptor? How does this affect the cell's response?

• The pathway continues to amplify the signal indefinitely.

• The production of cAMP stops, and the pathway shuts down.

• The pathway directly releases glucose from glycogen.

• The pathway deactivates the G-protein receptor permanently.