Which of the following statements regarding virus taxonomy is true?
A) Viruses are classified on the basis of the taxonomy of their host organisms.
B) Virus classes are well established.
C) Some virus family names are derived from the name of an important member of the family.
D) The species epithet is a Latin descriptor of the virion structure.
E) Virus classes are based on the domain of the host organism.
C
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Inversions occur when a portion of a chromosome is ________
a. relocated on a different chromosome b. lost c. repeated two or more times d. oriented in a reversed direction
Why are fall and spring temperatures colder in deeper areas of lakes than they are in the winter?
A) Air temperatures are colder in the fall and spring. B) There is a lag in time for the cold water to reach these depths. C) Aquatic animals are more active in the winter. D) Lake stratification causes colder water to sink in spring and fall.
Besides sending messages to and from the brain, the spinal cord has another important function: Reflexes. In fact, in very simple animals, that is the main function of the cord. In higher animals, reflexes are important because they provide
A. maintenance of life-sustaining processes such as breathing and heart beat, even while sleeping or unconscious. B. protection from sudden or unexpected environmental harms. C. objective physical evidence of neurological injury. D. stimulation of the brain as a protection against atrophy in situations where voluntary movement is hindered, such as a coma.
Fish can control buoyancy by:
a. holding air in their lungs. b. expelling air from their lungs. c. swift movements of their opercula. d. adjusting the amount of gas in their swim bladders. e. inflating the chambers of their tracheae.