The diffusion of water across a plasma membrane is referred to as
A. active transport.
B. osmosis.
C. countercurrent flow.
D. facilitated diffusion.
E. bulk flow.
B. osmosis.
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Regarding megafaunal extinctions, it is assumed that the driving factor was
A. climate change. B. the Ice Age. C. Homo sapiens. D. a meteorite. E. rising sea levels.
Recombinant DNA technology has been used for over 30 years to produce ____________________ in bacteria for the treatment of diabetes
Fill in the blank(s) with correct word
Which organ is responsible for the synthesis of ketones from fatty acids?
A. liver B. stomach C. heart D. brain E. kidney
Which of the following elements of the sliding-filament model of muscle contraction is incorrectly defined?
a) tropomyosin—a regulatory protein b) troponin complex—a set of additional regulatory proteins c) transverse tubules—infoldings of the plasma membrane d) sarcoplasmic reticulum—a specialized endoplasmic reticulum e) calcium ions—ions bound to the myosin protein that play a role in muscle contraction and relaxation