Which of the following is NOT True of phagocytosis?
A) Phagocytic cells are recruited to the site of an injury by chemoattractants such as complement C3b.
B) The phagocytic cell binds microbial invaders and engulfs them by means of pseudopodia, internalizing them in a phagosome.
C) If a phagocyte encounters something too large to engulf, it releases its toxic contents as a means of destroying that invader.
D) Within a phagolysosome, O₂ consumption decreases dramatically, allowing an enzyme to produce reactive oxygen species (ROS), which are toxic.
E) The phagolysosome releases undigested debris to the outside of the cell by fusing with the phagocyte's cytoplasmic membrane.

Question

Which of the following is NOT True of phagocytosis?
A) Phagocytic cells are recruited to the site of an injury by chemoattractants such as complement C3b. 
B) The phagocytic cell binds microbial invaders and engulfs them by means of pseudopodia, internalizing them in a phagosome.
C) If a phagocyte encounters something too large to engulf, it releases its toxic contents as a means of destroying that invader.
D) Within a phagolysosome, O₂ consumption decreases dramatically, allowing an enzyme to produce reactive oxygen species (ROS), which are toxic.
E) The phagolysosome releases undigested debris to the outside of the cell by fusing with the phagocyte's cytoplasmic membrane.

Quizplus · Accepted Answer

The correct statement is that within a phagolysosome, O₂ consumption increases (not decreases), which is part of the respiratory burst that allows enzymes to produce reactive oxygen species (ROS), which are toxic to the engulfed material.

Which of the Following Is NOT True of Phagocytosis