In the vertebrate kidney, blood filtration happens through the walls of special capillaries that form a tufted loop called a ____ , which is surrounded by a capsule
Fill in the blank with the appropriate word.
glomerulus
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A mixed solution of water and small molecules is exposed to a cell membrane and allowed to interact for an hour. Which molecule would be most likely to cross the phospholipid bilayer without the aid of transport proteins and diffuse across the membrane the fastest?
A. NH3 B. CH3COO- C. NH4+ D. Water E. Na+
There is concern over the use of 2,4-D, a synthetic plant hormone, as a weed killer because the by-product dioxin
A) can cause irreversible mutations in crop plants. B) causes fruit to drop prematurely from plants. C) can cause birth defects and leukemia in mammals. D) weakens the shells of the eggs of predatory birds, resulting in the death of their offspring.
There are not many species of fish living deep in the oceans, but the deep-sea fish occasionally pulled up by fisherman have been bizarre creatures, such as the deep-sea anglerfish with its giant fangs and bioluminescent lure. Why have these fascinating deep-sea fish never been shown live on exhibit in an aquarium?
A. They might frighten visitors. B. They are adapted to cold temperatures and total darkness. C. Their diet is too specialized. D. They are adapted for high pressure, and will die at low pressure.
Cocksackieviruses
A. can cause hand-foot-mouth disease. B. are paramyxoviurses. C. are retroviruses. D. are the etiological agents of hairy-cell leukemia. E. replicate in helper T cells.