Which of the following is NOT a function of lysosomes?
help in the formation of cell membranes
digesting particles taken in by endocytosis
degrading worn-out or nonfunctional organelles
breaking down bone to release calcium ions into the blood
The Correct Answer is A
A. Help in the formation of cell membranes: Lysosomes do not participate in building cell membranes. Their main role is to digest cellular waste, foreign particles, and damaged organelles, not to synthesize structural components like membranes.
B. Digesting particles taken in by endocytosis: Lysosomes contain hydrolytic enzymes that break down materials brought into the cell via endocytosis, helping the cell recycle nutrients and eliminate debris.
C. Degrading worn-out or nonfunctional organelles: Lysosomes perform autophagy, digesting damaged or obsolete organelles to maintain cellular health and prevent accumulation of dysfunctional components.
D. Breaking down bone to release calcium ions into the blood: Specialized lysosomes in osteoclasts secrete enzymes that degrade bone matrix, releasing calcium and phosphate ions into circulation, which is part of normal bone remodeling.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Detoxification of certain chemicals, such as drugs or pesticides: The smooth endoplasmic reticulum contains enzymes that modify and detoxify harmful substances, making them easier for the body to eliminate.
B. Protein synthesis in conjunction with ribosomes: Protein synthesis is primarily associated with the rough endoplasmic reticulum, which has ribosomes attached. The smooth ER does not participate directly in protein synthesis.
C. Lipid metabolism and cholesterol synthesis: The smooth ER is the main site for lipid and steroid hormone synthesis, including cholesterol, supporting membrane production and cellular signaling.
D. Breakdown of stored glycogen to form free glucose: The smooth ER in liver cells contains enzymes that catalyze glycogen breakdown, contributing to glucose release into the blood to maintain energy homeostasis.
Correct Answer is A
Explanation
Resting membrane potential arises from the uneven distribution of ions, primarily sodium (Na⁺) and potassium (K⁺), across the plasma membrane. Potassium tends to leak out of the cell while sodium remains higher outside, creating a negative charge inside relative to the outside. This separation of charges generates electrical potential energy while the cell is at rest.
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