The antibiotic streptomycin prevents protein synthesis in prokaryotes. Which cell component would be affected by this antibiotic?
A) ribosome
B) cell membrane
C) Golgi apparatus
D) cell wall
A
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Predict what would happen if the proximal convoluted tubule of the nephron lost its ability to reabsorb materials.
A. The volume of the urine would increase dramatically. B. Nitrogenous wastes would accumulate dramatically in the blood. C. K+ ions, Na+ ions, and HCO3- ions would be lost unnecessarily. D. Glucose would lost unnecessarily. E. Glucose, K+ ions, Na+ ions, and HCO3- ions would be lost unnecessarily.
Despite great diversity, all vertebrates share which basic homeostatic mechanism(s)?
a. digestion only b. metabolism only c. respiration only d. digestion and metabolism e. digestion, metabolism and respiration
A microtubule-organizing center (MTOC)
A) contains centrioles in plant cells. B) serves as a site for both microtubule and intermediate filament assembly. C) anchors either end of cytoplasmic microtubules. D) anchors only the minus ends of cytoplasmic microtubules. E) usually is positioned near the cell membrane.
Which of the following results from the stimulation by nerve impulses generated in the respiratory center when they arrive at the muscles involved in inspiration?
A) contraction of the diaphragm B) reduction in the efficiency of oxygen transport by the blood C) increase in air pressure in the lungs D) opening of the trachea E) downward movement of the ribs