Question

Once bound to the pathogen, for example, a bacterium, the following sequence of events takes place: The plasma membrane extends around the bacterium engulfing it (a similar process to endocytosis) The bacterium becomes enveloped in a vesicle formed from the plasma membrane of the phagocyte called a phagosome Organelles in the cytoplasm of the phagocyte called lysosomes fuse with the phagosome to form a phagolysosome The hydrolytic enzymes contained in the lysosomes digest the molecules of the bacterium destroying it The soluble products of digestion are absorbed into the cytoplasm of the phagocyte Any undigested materials are released from the cell by exocytosis. (This debris may serve to attract more phagocytes to the site of infection) a) True b) False

Answer 1

The described events correctly outline the process of phagocytosis, where a phagocyte engulfs a pathogen, digests it with lysosome enzymes, and expels undigested remains.

The correct answer is options (a)

Step-by-step explanation:

The sequence of events described in the question accurately represents the process of phagocytosis, an immune response carried out by specialized cells like macrophages. During phagocytosis, the plasma membrane of the phagocyte extends to engulf a pathogen into a vesicle known as a phagosome.

The phagosome then fuses with a lysosome to form a phagolysosome, where hydrolytic enzymes digest the pathogen. Soluble products from this digestion are absorbed into the cytoplasm, and any undigested materials are expelled via exocytosis. The correct answer is options (a)