Exposure to cold temperatures has what effect on microorganisms?
A) It removes moisture from the environment and thus prevents growth
B) It oxidizes and coagulates proteins
C) It retards the activities of most microbes
D) It denatures proteins
E) It kills endospores and thermophilic organisms
Ans: C) It retards the activities of most microbes
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Which of the following diseases is not caused by a spore-forming bacterium?
A) anthrax B) diphtheria C) gas gangrene D) tetanus
What condition develops when GABA levels in the brain are deficient?
A. epilepsy B. insomnia C. Huntington's disease D. Alzheimer's disease E. Parkinson's disease
The difference between normal and sickle-cell hemoglobin is based upon the
a. number of amino acids in the molecule. b. substitution of one amino acid for another. c. number and orientation of the amino acid chains attached to the heme portion of the molecule. d. number of oxygen molecules that can be carried. e. type of bone marrow that produces it.
_____ is an example of a proto-oncogene
Fill in the blank(s) with the appropriate word(s).