Worksheets12 Biology
Total questions: 22
Worksheet time: 18mins
What is the purpose of signal transduction pathways in cells?
To amplify electrical signals
To modify proteins
To release glucose from glycogen
To convert ATP into cAMP
What is the purpose of signal transduction pathways in cells?
To amplify electrical signals
To modify proteins
To release glucose from glycogen
To convert ATP into cAMP
What is the role of ligands in signal transduction pathways?
To attach to receptors
To convert ATP into cAMP
To activate protein kinases
To release glucose from glycogen
Which protein is responsible for converting ATP into cAMP?
G-protein
Adenylyl cyclase
Protein kinase
Phosphorylase
What happens when cAMP binds to the regulatory portions of protein kinase?
Protein kinase becomes inactivated
Protein kinase becomes activated
Protein kinase releases glucose from glycogen
Protein kinase converts ATP into cAMP
What is the purpose of cyclic AMP (cAMP) in signal transduction pathways?
To amplify electrical signals
To modify proteins
To release glucose from glycogen
To serve as a secondary messenger
Which molecule acts as a ligand in the signal transduction pathway described?
Epinephrine
G-protein
Adenylyl cyclase
Phosphorylase
What is the role of the alpha subunit in the signal transduction pathway?
To attach to adenylyl cyclase
To convert ATP into cAMP
To activate protein kinase
To release glucose from glycogen
Type of cell signaling where the ligand is produced at a location distant from its target cell(s)
autocrine signaling
juxtracrine signaling
paracrine signaling
endocrine signaling
I. Response
II. Amplification
III. Reception
IV. Transduction
Which of the following represents the sequence of events in a typical signal transduction pathway?
Adrenaline is released from your adrenal glands to affect various systems in the body. This is an example of ____ signaling.
juxtacrine (direct cell to cell contact)
endocrine (long distance)
paracrine (short distance)
autocrine (self-signaling)
What type of signaling is shown here?
autocrine (self-signaling)
juxtacrine (direct cell-to-cell contact)
endocrine (long-distance)
paracrine (short distance)
Many cancer cells signal themselves to grow and divide. This is an example of ______ signaling.
endocrine (long distance)
autocrine (self-signaling)
paracrine (short distance)
hormone (long distance)
After a cellular response is achieved, how is it terminated?
the ligand and receptor separate
block the transduction pathway
the cell will keep responding
send out a different signal
Which part of the signaling pathway could consist of protein modification, second messenger production, amplification or a phosphorylation cascade?
Reception
Transduction
Response
All of these
Once GTP replaces GDP, the alpha subunit always goes on to activate succeeding proteins.
True
False
Identify the secondary messenger.
Which of the following can activate a protein by transferring a phosphate group to it?
cAMP
G proteins
phosphodiesterase
protein kinase
