Symptoms of intense inflammation and shock occur in some gram-positive bacterial infections due to
A) A-B toxins.
B) lipid A.
C) membrane-disrupting toxins.
D) superantigens.
E) erythrogenic toxin.
D
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All cells in our body (e.g., a neuron or muscle cell) possess a type of protein that the immune system uses to identify them as our own cells. This protein is
A. CD4. B. lactoferrin. C. MHC I. D. MHC II. E. antigen.
Global warming has led to less snow cover in some areas. Snow cover provides insulation for
some burrowing, hibernating animals. In a population of rodents, some animals have slightly thicker fur, and animals with this trait are more likely to survive the winters with low snow cover and thus produce offspring in the spring. This scenario is an example of
a. an adaptation. b. evolution. c. natural selection. d. homology.
Which organelle contains enzymes that break down damaged cell parts?
A.) centriole B.) lysosomes C.) vacuole D.) mitochondria
Which statement best summarizes the difference between ectothermic and endothermic organisms?
A) Ectotherms are warm-blooded, but endotherms are cold-blooded. B) Endotherms control their temperature, but ectotherms have no control over their temperature. C) Ectotherms absorb external heat, but endotherms use metabolic heat to maintain a warm, steady body temperature.