Multiple Choice
Where are photoreceptors primarily located in the human body?
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10. Cell Signaling
Introduction to Cell Signaling
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In the context of cell signaling, what are papillae?
A
Small projections on the surface of the tongue involved in taste sensation
B
Intracellular organelles responsible for ATP production
C
Membrane-bound receptors that bind signaling molecules
D
Enzymes that phosphorylate target proteins during signal transduction
Verified step by step guidance1
Step 1: Begin by understanding the term 'papillae' in the context of biology. Papillae are small projections found on the surface of the tongue, and they play a role in taste sensation.
Step 2: Eliminate the incorrect options by analyzing their definitions. For example, intracellular organelles responsible for ATP production refer to mitochondria, not papillae.
Step 3: Consider the option 'Membrane-bound receptors that bind signaling molecules.' These are typically proteins involved in cell signaling, such as G-protein coupled receptors, and are not related to papillae.
Step 4: Evaluate the option 'Enzymes that phosphorylate target proteins during signal transduction.' These enzymes are kinases, which are involved in signaling pathways, but they are not papillae.
Step 5: Conclude that the correct definition of papillae is 'Small projections on the surface of the tongue involved in taste sensation,' as this matches their biological function.
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