MCAT Question A Day - 6/5/14 - Answer!
When a primary lysosome fuses with a food vesicle to become a secondary lysosome:
A. its pH drops via active pumping of protons into its interior.
B. its pH drops via active pumping of protons out of its interior.
C. its pH rises via active pumping of protons into its interior.
D. its pH rises via active pumping of protons out of its interior.
A is correct. The hydrolytic enzymes of.lysosomes are activated by a low pH achieved by pumping protons into the interior.
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A is correct. The hydrolytic enzymes of.lysosomes are activated by a low pH achieved by pumping protons into the interior.
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