The most common DNA-binding motif is the
A. non-helical zipper.
B. leucine zipper.
C. zinc finger.
D. homeodomain.
E. helix-turn-helix.
E. helix-turn-helix.
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In the United States, most common exposure to Clostridium botulinum and its toxins occurs through __________.
Fill in the blank(s) with correct word(s).
Aerobic respiration became established as a result of
the evolution of a. the first proto-cells. b. the first true cells. c. metabolism. d. the cyclic pathway of photosynthesis. e. the noncyclic pathway of photosynthesis.
Carbon dioxide enters a plant from the atmosphere through pores called
A. guard cells. B. companion cells. C. sieve tubes. D. nodes. E. stomata.
Exceptionally large babies increase a mother's mortality risk when giving birth and exceptionally small babies tend to die at birth or shortly afterward. For these reasons, birthweight in human babies is generally:
a) not a heritable trait. b) subject to disruptive selection. c) subject to stabilizing selection. d) under even stronger selection today than it was before the development of Caeserian delivery. e) All of the above.