Multiple Choice
Which of the following affects all other steps in the cell communication process?
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10. Cell Signaling
Introduction to Cell Signaling
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Which explanation correctly identifies how G protein–linked receptors are similar?
A
They all function as ion channels that allow ions to pass through the membrane.
B
They all have seven transmembrane α-helices that span the plasma membrane.
C
They all bind steroid hormones inside the cytoplasm.
D
They all directly phosphorylate target proteins upon ligand binding.
Verified step by step guidance1
Understand the role of G protein–linked receptors: These are a type of membrane receptor involved in signal transduction, meaning they help transmit signals from outside the cell to the inside.
Recognize the structural feature of G protein–linked receptors: They all share a characteristic structure of seven transmembrane α-helices that span the plasma membrane. This is a key similarity among all G protein–linked receptors.
Eliminate incorrect options: G protein–linked receptors do not function as ion channels, nor do they bind steroid hormones inside the cytoplasm. Additionally, they do not directly phosphorylate target proteins upon ligand binding.
Focus on the correct explanation: The correct similarity is that all G protein–linked receptors have seven transmembrane α-helices, which is essential for their function in signal transduction.
Conclude the reasoning: By understanding the structure and function of G protein–linked receptors, you can identify the correct explanation as the one describing their shared structural feature of seven transmembrane α-helices.
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