Which substance binds more tightly than oxygen to hemoglobin?

a. nitrogen
b. carbon dioxide
c. hydrogen
d. helium
e. carbon monoxide


E

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology