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Compared to a typical animal cell, the cell membranes on the paw of a polar bear would most likely have an increased concentration of which macromolecule?
  • a)
    Unsaturated phospholipids
  • b)
    Saturated phospholipids
  • c)
    Aquaporin proteins
  • d)
    Potassium channel proteins
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Compared to a typical animal cell, the cell membranes on the paw of a ...
The cell membranes of polar bear paws would most likely have an increased concentration of unsaturated phospholipids compared to a typical animal cell. Unsaturated phospholipids contain fatty acid chains with double bonds, which introduce kinks in the hydrocarbon chain. These kinks prevent the phospholipids from packing closely together, increasing membrane fluidity. This increased fluidity is advantageous in colder environments because it helps to prevent the cell membrane from becoming too rigid and losing its functionality.
Polar bears live in extremely cold environments, and their paw pads are exposed to low temperatures. By having a higher concentration of unsaturated phospholipids in their cell membranes, the polar bears can adapt to the cold temperatures and maintain proper membrane fluidity. The unsaturated phospholipids allow the cell membranes to remain flexible and functional even at low temperatures.
Aquaporin proteins and potassium channel proteins are not specifically related to membrane fluidity and are involved in other processes such as water transport and ion channel regulation, respectively. Therefore, they are not the most likely macromolecules to have an increased concentration in the cell membranes of polar bear paws compared to a typical animal cell.
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Compared to a typical animal cell, the cell membranes on the paw of a polar bear would most likely have an increased concentration of which macromolecule?a)Unsaturated phospholipidsb)Saturated phospholipidsc)Aquaporin proteinsd)Potassium channel proteinsCorrect answer is option 'A'. Can you explain this answer? for MCAT 2025 is part of MCAT preparation. The Question and answers have been prepared according to the MCAT exam syllabus. Information about Compared to a typical animal cell, the cell membranes on the paw of a polar bear would most likely have an increased concentration of which macromolecule?a)Unsaturated phospholipidsb)Saturated phospholipidsc)Aquaporin proteinsd)Potassium channel proteinsCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for MCAT 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Compared to a typical animal cell, the cell membranes on the paw of a polar bear would most likely have an increased concentration of which macromolecule?a)Unsaturated phospholipidsb)Saturated phospholipidsc)Aquaporin proteinsd)Potassium channel proteinsCorrect answer is option 'A'. Can you explain this answer?.
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