In herbivores, cellulose is primarily broken down by
A. bacteria living within the herbivore gastrointestinal tract.
B. helminthes living within the herbivore.
C. enzymes produced by the intestinal glands.
D. enzymes produced by the salivary glands.
E. enzymes produced by the stomach glands.
A. bacteria living within the herbivore gastrointestinal tract.
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To have a hormone receptor system that is responsive to changes in hormone concentration, it is useful if the concentration of the hormone is
A) always more than 10 times the Kd. B) never more than 10 times the Kd. C) far below the Kd before the stimulation of hormone secretion. D) far above the Kd before the stimulation of hormone secretion. E) always constant.
What are four functions of the muscular system?
What will be an ideal response?
Which of the following is a characteristic shared by DNA and RNA polymerases?
A) efficiency of proofreading B) type of nucleotides used C) direction of polymerization D) speed E) dependence on helicase
Spores known as akinetes are reproductive structures of
A) members of the Bacillus genus. B) members of the genus Mycoplasma. C) members of the proteobacteria. D) members of the Archaea. E) members of the cyanobacteria.