Channels that open due to a compound binding to receptor sites on the extracellular surface of the channels would be considered: non gated ion channels
voltage gated ion channels
ligand gated ion channels
g complex linked receptor proteins
carrier proteins
The Correct Answer is B
A. voltage gated ion channels: These open in response to changes in membrane potential, not chemical binding.
B. ligand gated ion channels: Ligands (like neurotransmitters) bind to the channel, causing it to open or close.
C. G-protein complex linked receptor proteins: These are receptors that activate intracellular signaling cascades, not ion channels directly.
D. carrier proteins: Carrier proteins transport substances across membranes but do not form open channels.
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Related Questions
Correct Answer is C
Explanation
A. isotonic; nothing: Isotonic means equal solute concentration. 0.9% NaCl is isotonic; 9.0% is much higher, so not isotonic.
B. hypotonic; crenation: A hypotonic solution has less solute than the cell. Crenation (shriveling) occurs in a hypertonic solution.
C. hypertonic; crenation: A 9.0% NaCl solution is hypertonic (more solutes than inside the cell). Water moves out of red blood cells, causing them to shrink or crenate.
D. hypertonic; lysis: Lysis (bursting) occurs in hypotonic solutions, where water enters the cell.
Correct Answer is D
Explanation
A. triglycerides: Triglycerides are stored in fat cells, not a major component of membranes.
B. eicosanoids: These are signaling molecules, not structural components of the plasma membrane.
C. steroids: While cholesterol (a steroid) is present in membranes, it's not the most abundant.
D. phospholipids: The plasma membrane is primarily made of a phospholipid bilayer, forming the main structural framework.
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