The body fluid of sharks has a much lower concentration of sodium chloride than that of the surrounding seawater, and yet they are able to remain in osmotic equilibrium with the external environment. How can this be the case?
A. Sharks store enough urea in their
bloodstream to match the total solute
concentration of the surrounding seawater.
B. Sharks are osmoregulators.
C. Sharks maintain high levels of sodium
chloride in their skin.
D. Sharks drink large volumes of seawater to
compensate for the low salt concentration of
their body fluids.
E. None of the answer options is correct.
A
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The umbilical arteries carry
A. oxygen-rich blood to the developing fetus. B. oxygen-rich blood to the mother. C. oxygen-poor blood to the placenta. D. oxygen-rich blood to the placenta. E. oxygen-poor blood to the developing fetus.
You find some rather strange plants in your backyard. They consist only of thin, pale yellow stems that are wrapped around other species of plants growing nearby. You experiment by unwrapping some of the strange yellow plants and planting half of them alone in pots of soil and half in pots with other plants from your yard. You water and fertilize both sets of pots, but after a few weeks you find that the yellow plants that were potted alone have died, while those potted with other plants are thriving. What term would you use to describe the strange yellow plants?
A. holoparasitic B. asexual C. monophagous D. aposematic E. hemiparasitic
A large groove that runs around the heart, and separates the atria from the ventricles is the
A. anterior interventricular septum. B. posterior interventricular septum. C. coronary sinus. D. coronary sulcus. E. cardiac fissure.
ALL of the following are natural human defenses against disease EXCEPT
a) interferon. b) penicillin. c) skin. d) mucous membranes.