The major histocompatibility complex is
A. a set of genes that code for MHC glycoproteins.
B. a set of glycoproteins, called MHC antigens, found on all body cells.
C. located in the thymus gland.
D. found on the third chromosome.
E. All of the choices are correct.
Answer: A
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Flukes and tapeworms belong to the phylum containing the
A. cnidarians. B. annelids. C. nematodes. D. sponges. E. flatworms.
Four of the five actions listed below are responses to
the loss of body heat. Select the exception. a. panting b. blood routed to deeper tissues c. constriction of peripheral blood vessels d. increased respiration e. increased metabolic rates
Which of the following statements about biomes, the major terrestrial ecosystems covering the Earth, is true?
A) Each of the nine major biomes is restricted to just one or two continents. B) The major factors affecting the distribution of biomes are wind and sunlight. C) Most biomes are characterized by a particular group of species. D) Most natural biomes are unaffected by human activity. E) Fire is very important in some biomes.
Who proved that microorganisms cause disease?
A. Pasteur B. van Leeuwenhoek C. Jenner D. Koch