Which human heart chamber has the thickest wall?
What will be an ideal response?
the left ventricle
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The early energy reactions used hydrogen, which is a powerful ________ and could have been used to form ________
A) oxidant / the proton motive force B) electron donor / the proton motive force C) electron acceptor / oxygen D) oxidant / oxygen
The lag phase of the bacterial growth curve is marked by
A. a decrease in cell mass. B. dormant, metabolically inactive cells. C. metabolically active cells. D. vigorously dividing cells.
ACTH (corticotropin)
a. is secreted by the posterior pituitary. b. has target cells in the autonomic nervous system. c. has target cells in the adrenal glands d. has target cells in the adrenal medulla. e. initiates the autoimmune response.
Oxygen, with an atomic number of 8, is a neutral atom and has ________ electrons in the first electron shell and ________ electrons in the second electron shell
A) 4; 4 B) 3; 5 C) 5; 3 D) 1; 7 E) 2; 6