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 D
Explanation
A. anterior to her shoulders: Anterior means in front of the body. During a pole vault, Stacy’s hips are typically above her shoulders, not in front.
B. posterior to her shoulders: Posterior means behind the body. Her hips are not necessarily behind her shoulders in the motion.
C. inferior to her shoulders: Inferior means below. Her hips are elevated higher than her shoulders mid-vault.
D. superior to her shoulders: Superior means above. In the airborne phase of a pole vault, Stacy’s hips are above her shoulders, making them superior in position.
Correct Answer is C
Explanation
A. isotonic; nothing: Isotonic means equal solute concentration. 0.9% NaCl is isotonic; 9.0% is much higher, so not isotonic.
B. hypotonic; crenation: A hypotonic solution has less solute than the cell. Crenation (shriveling) occurs in a hypertonic solution.
C. hypertonic; crenation: A 9.0% NaCl solution is hypertonic (more solutes than inside the cell). Water moves out of red blood cells, causing them to shrink or crenate.
D. hypertonic; lysis: Lysis (bursting) occurs in hypotonic solutions, where water enters the cell.
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