During an asthma attack, allergens trigger the release of histamine, which causes severe constriction of the __________________.  

A.  pleural cavities
B.  trachea
C.  rib cage
D.  bronchi
E.  larynx


D.  bronchi

Biology & Microbiology

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Vernalization can result in the remodeling of chromatin in some species, which means:

A. plants are able to "know" if they have experienced winter. B. plants can pass on acquired changes to their offspring. C. plants may grow new cells, and those cells will not "know" they have experienced winter. D. products of mitosis will not "remember" winter. E. products of meiosis will "remember" winter.

Biology & Microbiology

Earth is the warmest it has been for ____ years

a. 12 b. 120 c. 1200 d. 12, 000 e. 12, 000, 000

Biology & Microbiology

Saturated fats are saturated with ________

A) carbon B) nitrogen C) hydrogen D) oxygen

Biology & Microbiology

The reactant in an enzyme-catalyzed reaction is the

A) product. B) allosteric inhibitor. C) activation energy. D) active site. E) substrate.

Biology & Microbiology