Which type of virus is most likely to cause the immediate damage and destruction of an infected animal cell when it is released?
A) Enveloped virus
B) RNA virus
C) DNA virus
D) Nonenveloped virus
D) Nonenveloped virus
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Answer the following statements true (T) or false (F)
1. When Schmidt-Nielsen and his colleagues followed a "pulse" of air through the respiratory system of an ostrich, it took two full cycles of inhalation and exhalation for this pulse to pass through and be exhaled. 2. Chemoreceptors for oxygen normally play the most important role in regulating breathing rate. 3. Smaller mammals typically have higher ventilation rates than large mammals. 4. The shape of the oxygen-hemoglobin dissociation curve is a straight line. 5. Asthma attacks result from contraction of the muscles surrounding the bronchioles.
What is the term for the open water portions of the ocean?
a. benthic b. intertidal c. pelagic d. neritic
If two populations of a species show significant structural differences, it is likely that
A. there is little sexual reproduction between populations. B. they are reproductively isolated. C. each is specifically adapted to a certain environmental situation. D. All of the choices are correct.
Against which hard structure do the circular and longitudinal muscles of annelids work?
A) cuticle B) shell C) endoskeleton D) hydrostatic skeleton