Suppose several genes are grouped together in a genome and the group results in a single enzyme. If one of these genes is mutated and the enzyme is no longer active, this gene must be part of _____
A) an intron
B) an operon
C) a repressor
D) an activator
E) an inducer
Answer: B
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Phagocytosis (Phagotrophy) is:
A. attack of cells by bacteriophages B. the phases through which cells pass during division C. the disintegration of a cell D. the attachment of protist cells to a substrate E. the capture of food particles by a cell
The creeping horizontal and subterranean stems of ferns are referred to as
a. prothalli b. fronds c. stipes d. roots e. rhizomes
Which one of the following causes the most severe illness in humans, with a mortality rate of 30 percent?
A) western equine encephalitis
B) eastern equine encephalitis
C) St. Louis encephalitis
D) California encephalitis
E) West Nile encephalitis
All of the following statements about sensory receptors are true EXCEPT
A. sensory receptors monitor the internal environment of the body. B. photoreceptors include rod and cone cells. C. chemoreception is believed to be a primitive sense in animals. D. the retina of the eye contains photoreceptors that are sensitive to light. E. sensory receptors for taste are found in the nose and mouth.