The mechanism of action of erythromycin is
A) inhibition of protein synthesis.
B) inhibition of cell wall synthesis.
C) inhibition of nucleic acid synthesis.
D) inhibition of a metabolic pathway.
E) disruption of cytoplasmic membranes.
A
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The mosaic of the fluid mosaic model refers to ____
a. specific proteins in membranes b. the liquid inside a cell c. the phospholipids in membranes d. the passage of materials into cells e. the diverse molecules making up membranes
The pain produced in an internal organ may be perceived as occurring somewhere else. This is called
a. mixed nerve messages. b. referred pain. c. phantom pain. d. psychosomatic pain. e. hypochondria.
What do both the C4 and CAM pathways of photosynthesis allow plants to do?
A) to perform photosynthesis in the absence of carbon dioxide B) to outcompete C3 plants in cool, dry conditions C) to keep stomata partially or completely closed during the hottest parts of the day D) to take up carbon dioxide at night and then store it as an acid until the day
It is proposed that Cro-Magnons were responsible for the extinction of many large mammals during the Pleistocene epoch. How could this feat have been accomplished?
A. Cro-Magnon man was the first species of hominids to hunt in groups. This would have increased their chance of killing larger animals. B. Cro-Magnon man was the first species of hominid to use fire. This would have increased their success during hunting. C. Cro-Magnon man was the most efficient bipedal species. They would have been able to run after prey species more efficiently than any of their predecessors. D. Cro-Magnon man had an increase in tool technology that enabled them to kill animals from a distance.