Countercurrent exchange is evident in the flow of _____
A) water across the gills of a fish and the blood within those gills
B) blood in the dorsal vessel of an insect and that of air within its tracheae
C) air within the primary bronchi of a human and the blood within the pulmonary veins
D) water across the skin of a frog and the blood flow within the ventricle of its heart
A
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A particle that consists of nucleic acids surrounded by protein and requires a host organism to replicate is
A. a bacteria. B. a viroid. C. a plasmid. D. a virus. E. a prion.
Would babies need to be immunized against lockjaw (tetanus) if their mother had been immunized against the disease? Why or why not?
A. No-because the mother's IgG antibodies would be passed along through the placenta before birth, protecting the baby from the infection. B. Yes-because even though maternal IgG antibodies might be passed along through the placenta, they will not last forever. The baby will need to create its own antibody response to be protected against future tetanus. C. No-because maternal IgG antibodies would be passed along in the breast milk, protecting the baby from infection. D.
What is the Golgi body's function in the cell?
a. ATP production b. transport of glucose molecules c. digestion of worn-out cell organelles d. packaging and processing center for macromolecules
In order to establish a membrane potential, the
cytoplasmic fluid is ____ compared to the interstitial fluid
a. more positively charged b. more negatively charged c. hypertonic d. hypotonic e. none of these