The Correct Answer is {"dropdown-group-1":"B"}
A. Spectrin: As noted earlier, this is a protein that helps maintain the shape of red blood cells.
B. Hematocrit: A hematocrit test measures the "packed cell volume" to see what percentage of whole blood is made up of red blood cells.
C. Hematopoiesis: This is the physiological process of blood cell formation, not a measurement.
D. Hemocytometer: This is a specialized slide used to count individual cells under a microscope, but it does not measure the volume percentage directly like a centrifuge/hematocrit.
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Correct Answer is D
Explanation
A. endocytosis: This involves the cell membrane folding inward to form a vesicle, rather than a single protein changing shape.
B. the sodium and potassium pump: While this is a type of carrier, it specifically requires energy (ATP). The question describes the general mechanism of a carrier, which can be active or passive.
C. channel-mediated transport: Channels are "tunnels" that allow solutes to pass through without the protein significantly changing shape for every molecule.
D. carrier-mediated transport: This is the specific definition of how a carrier protein works: it binds a ligand, undergoes a conformational change, and moves the substance across the membrane.
Correct Answer is C
Explanation
A. Absorption: This is a major function of epithelial tissue, particularly in the digestive tract.
B. Secretion: Glandular epithelium is specialized to secrete substances like sweat, enzymes, and hormones.
C. Assimilation: This is the correct choice because it is a metabolic process of the whole body/cell to incorporate nutrients, not a specific primary function of epithelial tissue.
D. Protection: The skin (epidermis) is epithelial tissue that serves as the body's primary protective barrier.
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