
Signaling
Quiz
•
Health Sciences
•
University
•
Practice Problem
•
Easy
Andrew Smith
Used 1+ times
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26 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following best describes the function of a second messenger?
It directly binds to receptors on the cell membrane
It is a hormone that circulates in the blood
It is generated inside the cell following receptor activation and mediates intracellular effects
It degrades neurotransmitters in the synaptic cleft
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which type of signaling is primarily associated with neurotransmitters?
Endocrine
Paracrine
Autocrine
Exocrine
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the function of cAMP phosphodiesterase?
Converts ATP to cAMP
Converts cAMP to AMP
Activates PKA
Inhibits adenylate cyclase
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which second messenger system is primarily responsible for activating Protein Kinase A (PKA)?
cAMP
IP₃
DAG
cGMP
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a correct match between receptor location and hormone type?
Membrane receptors – Steroid hormones
Cytoplasmic receptors – Protein hormones
Nuclear receptors – Steroid hormones
Membrane receptors – Lipophilic hormones
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the expected biochemical result of a pertussis toxin exposure?
Decreased cAMP due to Gαs inhibition
Increased cAMP due to Gαi inhibition
Increased DAG due to PLC activation
Decreased NO synthesis
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following best explains how β-blockers lower heart rate?
They block Gαi and increase cAMP
They activate Gαq to inhibit PKA
Reducing Gαs activation and decreasing cAMP
They stimulate PIP₂ cleavage by PLC
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