Which molecule below does not act as a neurotransmitter and a hormone?
a) thyroid hormone
b) glycine
c) dopamine
d) glutamate
e) eicosanoids
Ans: e) eicosanoids
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Which of the following is a difference between electronegative and electropositive atoms?
A. Electronegative atoms tend to lose electrons. B. Electropositive atoms tend to gain electrons. C. Because oxygen (O) is strongly electropositive it will have a partial positive charge in H2O. D. Because hydrogen (H) is strongly electronegative it will have a partial negative charge in H2O. E. As atomic radii decrease, atoms tend to become more electronegative.
Which of the following has the difference between its pressure and atmospheric pressure driving the air into and out of the lungs?
A) atmospheric pressure B) transpulmonary pressure C) intrapleural pressure D) intra-alveolar pressure E) rebound pressure (elastic recoil)
Oocytes are the largest cells by volume in the human body, reflecting the presence of large amounts of cytoplasm containing (select all correct choices):
A. molecules that direct early cell divisions. B. food in the form of yolk. C. the developing placenta. D. twice the amount of DNA of other cells in the body. E. polar bodies.
Plants are a:
a. polyphyletic group. b. monophyletic group. c. group without a common ancestor. d. group with many ancestors. e. paraphyletic group.