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Q 1/10
Score 0
Which of the following best describes the primary functional difference between a G protein-coupled receptor (GPCR) and a receptor tyrosine kinase (RTK)?
30
GPCRs require the binding of multiple ligands to initiate a response, whereas RTKs are activated by the binding of a single molecule of GTP directly to the extracellular domain.
GPCRs are found exclusively in the nucleus of the cell, whereas RTKs are transmembrane proteins found only on the plasma membrane.
RTKs function as ion channels that open upon ligand binding, while GPCRs must undergo dimerization to phosphorylate their own cytoplasmic domains.
RTKs possess intrinsic enzymatic activity and can trigger multiple signal transduction pathways simultaneously, while GPCRs typically activate a single type of G protein and rely on secondary messengers.
Q 2/10
Score 0
In the context of cell signaling, what is the immediate consequence of a ligand binding to a G protein-coupled receptor (GPCR)?
30
The ligand is internalized via endocytosis and acts as a transcription factor by binding directly to the promoter region of target genes.
The receptor undergoes a conformational change that triggers the displacement of GDP by GTP on the subunit of the associated G protein.
The receptor undergoes dimerization and begins phosphorylating the hydroxyl groups of specific tyrosine residues on its own cytoplasmic tail.
A phosphate group is immediately transferred from ATP to the ligand, which then enters the cytosol to activate second messengers like cAMP.
10 questions
Q.
Which of the following best describes the primary functional difference between a G protein-coupled receptor (GPCR) and a receptor tyrosine kinase (RTK)?
1
30 sec
Q.
In the context of cell signaling, what is the immediate consequence of a ligand binding to a G protein-coupled receptor (GPCR)?
2
30 sec
Q.
The medication Viagra (sildenafil) inhibits an enzyme that breaks down cGMP, a common second messenger. In a normal signal transduction pathway involving a G protein-coupled receptor (GPCR), which of the following events would most likely precede the production of a second messenger like cGMP or cAMP?
3
30 sec
Q.
Which of the following events is a distinguishing characteristic of Receptor Tyrosine Kinase (RTK) activation that is NOT typically found in G Protein-Coupled Receptor (GPCR) activation?
4
30 sec
Q.
5
30 sec
Q.
In certain cell types, the binding of a growth factor to a Receptor Tyrosine Kinase (RTK) initiates the Ras-MAPK pathway. Which of the following best describes the role of Ras in this context?
6
30 sec
Q.
Which of the following describes a scenario where a signaling pathway is terminated?
7
30 sec
Q.
Which of the following scenarios best illustrates the concept of signal amplification within a G protein-coupled receptor (GPCR) pathway?
8
30 sec
Q.
The signaling molecule epinephrine can bind to a G protein-coupled receptor (GPCR) to induce glycogen breakdown. If a mutation prevents the inactive G protein from associating with the GPCR, what would be the most likely result upon the addition of epinephrine?
9
30 sec
Q.
Which of the following describes the most likely reason why a mutation that eliminates the intracellular tyrosine residues of a Receptor Tyrosine Kinase (RTK) would halt its signaling pathway?
