An attenuated strain of a pathogen
A) has lost its virulence, but may be used to create a vaccine.
B) has changed its antigens to avoid an adaptive immune response.
C) is more virulent than the regular strains and may cause septic shock.
D) is an extracellular pathogen that will be cleared by innate immunity.
Answer: A
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Multicellular animals with pressurized circulatory systems use a three-step process to isolate and eliminate wastes. Arrange these steps in order from earliest to latest
A. filtration; reabsorption; secretion B. secretion; filtration; reabsorption C. filtration; secretion; reabsorption D. reabsorption; filtration, secretion E. secretion; reabsorption; filtration
Which of the following is a virus with an icosahedral head, a capsid that contains primarily three proteins, a connecting neck with a collar and long whiskers, a long tail and a complex base plate?
A. influenza virus B. measles virus C. T4 bacteriophage D. HIV E. tuberculosis
The directional movements of the ocean currents are mainly due to the ________
a. force of the wind b. amount of rainfall the region receives c. distance to the sun d. depth of the water e. temperature of the water
One application in which an archaeal species is used in bioengineering and bioremediation is:
a. antibiotic production b. building new coral reefs c. probiotics d. polymerase chain reaction (PCR)