Water has an unusually high boiling point for its molecular weight because water molecules ____
a. are very dense
b. get much heavier as they are heated
c. are held to each other by hydrogen bonds
d. are held together by covalent bonds
e. form hydration layers
ANSWER: c
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The modern evolutionary synthesis of the 1930s and 1940s melded together Darwin's findings with ________.
A. chemistry B. psychology C. genetics D. sociology
The U.S. Food and Drug Administration warns children, mothers and potential mothers to avoid eating tuna because of high mercury levels. A typical can of albacore tuna contains about 4 times the amount of mercury that a healthy, average-sized adult may safely consume in a day. Do you think cans of tuna should carry labels warning of mercury content?
1.Yes; we can’t risk having children or mothers negatively affected by mercury poisoning. 2.No; the FDA advisory about mercury is enough warning.
Which two of the following statements regarding virulence factors are correct?
a. Virulence factors are microbial adaptations used to invade and establish in the host b. Virulence factors are structures used for attachment to the host c. Pathogens all contain a host of virulence factors that act in concert to cause infection d. Virulence factors determine the degree of tissue damage that occurs
Receptor Mediated endocytosis:
A. is involved in receptor recycling B. involves cell membrane fusion C. can involve the protein clatherin D. can induce a refractory period for signal transduction E. all of the above