A selective poison that blocked the function of the mitochondria was used on a group of cells. Which of the following mechanisms for crossing the membrane would most likely be interrupted by the presence of this poison?
osmosis
facilitated diffusion
active transport
through channels
The Correct Answer is C
A. osmosis: Osmosis is passive (requires no energy), so it will still occur even if mitochondria are poisoned.
B. facilitated diffusion: Facilitated diffusion uses transport proteins but does not require ATP-still functional without mitochondria.
C. active transport: Active transport requires ATP, which is produced by the mitochondria. Blocking mitochondria interrupts ATP production, halting active transport.
D. through channels: Movement through ion channels is usually passive (e.g., diffusion), and does not require ATP.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. it is a base and the hydrogen ion concentration increased: A base decreases H⁺ concentration by accepting H⁺ or releasing OH⁻.
B. it is an acid and the hydrogen ion concentration decreased: Acids increase H⁺ concentration, and a pH of 9.4 is basic, not acidic.
C. it is a base and the hydrogen ion concentration decreased: A pH of 9.4 is above 7, indicating a basic solution, and bases lower H⁺ concentration.
D. it is a buffer and the hydrogen ion concentration increased: A buffer resists changes in pH; it doesn't make pH jump to 9.4. Also, H⁺ would not increase in a basic environment.
Correct Answer is C
Explanation
A. Cardiovascular:
Transports blood, but does not directly sense/respond to environmental changes.
B. Lymphatic:
Supports immune function and fluid balance, but not primarily responsible for homeostasis.
C. Endocrine:
Regulates hormones and maintains long-term homeostasis such as temperature, fluid balance, and glucose levels.
D. Respiratory:
Involved in gas exchange, but homeostasis is a secondary role.
E. Urinary:
Eliminates waste and regulates volume, but is a response mechanism rather than a regulatory system.
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