Nonspecific chemical defenses include
A. skin's acidic pH and fatty acids.
B. stomach hydrochloric acid.
C. lactic acid and electrolytes of sweat.
D. lysozyme.
E. All of these choices are correct.
Answer: E
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____ behavior corresponds to an animal's "nature"; learned behavior corresponds to its " ____ ."
Fill in the blank with the appropriate word.
Match the following items with the correct phrases.
_______1. Example of the immunity that results from the body's response to an invading microorganism. _______2. Example of the immunity that results from the body's response to a vaccine. _______3. Example of antibodies that a person receives in an injection of gamma globulin (immune serum globulin). _______4. Examples of maternal antibodies that a fetus receives across the placenta and maternal antibodies that an infant receives in colostrum. a. artificial active acquired immunity b. artificial passive acquired immunity c. natural active acquired immunity d. natural passive acquired immunity
Transcription factors appear to be important molecules relating to the regulation of gene activity. In eukaryotes, two general classes or transcription factors exist. Briefly describe each
What will be an ideal response?
X-ray diffraction images produced by ____ were used by Watson and Crick to infer the structure of DNA
a. Wilkins b. Griffith c. Franklin d. Hershey e. Watson and Wilkins