Apentix/AP Biology/Unit 2: Cell Structure and Function/Question
AP Biologyeasymcq1 pt

A macrophage engulfs a bacterium into a membrane-bound vesicle inside its cytoplasm. Fusion with a second organelle then destroys the captive cell. Which organelle took part in that fusion?

A.The lysosome, whose hydrolytic enzymes digest the vesicle's contents
B.The mitochondrion, which burns the contents with respiratory heat
C.The chloroplast, which sterilizes the vesicle with absorbed light
D.The ribosome, which builds antibiotic peptides around the captive cell

Explanation

Core Concept

Lysosomes carry dozens of acid hydrolases optimized for low pH. Fusing with the engulfment vesicle produces a compartment whose acidic interior activates those enzymes, degrading the bacterium into reusable molecular pieces. This digestive partnership is the standard disposal route in phagocytic cells.

Correct Answer

AThe lysosome, whose hydrolytic enzymes digest the vesicle's contents

More Unit 2: Cell Structure and Function practice questions

Try a random question →

Practice more AP Biology questions with full explanations

Practice Unit 2: Cell Structure and Function Questions →