Which substance binds more tightly than oxygen to hemoglobin?
a. nitrogen
b. carbon dioxide
c. hydrogen
d. helium
e. carbon monoxide
E
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The use of arsenic compound Salvarsan as a treatment for syphilis is credited to
A. Ehrlich. B. Waksman. C. Chain. D. Fleming.
Select the immunoglobin (Ig) classes that is correctly matched to their facts. Check all that apply.
_____ IgA—found in saliva, tears, the GI tract, and mother's milk _____ IgD—serve as receptors on the surfaces of T cells _____ IgE—promotes the release of histamine from mast cells and basophils, causing allergy symptoms _____ IgG—a minor form of immunoglobulin, used only in response to parasitic worms _____ IgM—first secreted during primary response, promotes agglutination, activates complement
Which of the following causes of mutations is incorrectly matched with its mechanism of action?
a. Spontaneous mutations: mistakes arise as long strands of DNA are duplicating themselves. b. Radiation-induced mutations: energy disrupts atomic structure and breaks apart chromosomes. c .Chemical-induced mutations: chemicals react with atoms in DNA molecules and induce mutations. d. Spontaneous mutations: enzymes cause errors due to their highly erroneous nature. e. None of the above is incorrectly matched with its mechanism of action.
While you are riding the ski lift up to the top of the mountain on a very cold day, you start to shiver involuntarily. You know that the shivering is your body?s attempt to help regulate your body temperature and is an example of what type of mechanism?
A. energy utilization B. evolutionary adaptation C. sensitivity D. homeostasis