Red tide and extensive fish kills are caused by population blooms of ____
a. euglenoids
b. dinoflagellates
c. diatoms
d. ciliates
e. brown algae
ANSWER: b
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The topoisomerase DNA gyrase will introduce negative supercoils into DNA. What effect will this enzyme have on relaxed, covalently closed DNA?
A. The linking number will increase. B. The DNA will become overwound. C. The treated DNA will migrate farther in an agarose gel than the relaxed DNA. D. The linking number will become undefined. E. The relaxed DNA will migrate farther in an agarose gel than the treated DNA.
____________________ result from immunological hypersensitivity to what should be harmless substances
Fill in the blank(s) with correct word
During menopause:a
estrogen levels rise. b. menstruation ceases. c. many ova are released. d. women experience cold flashes. e. all of these are correct
Which term refers to the initial branches of the trachea that lead into each lung?
a. bronchioles b. alveoli c. pleura d. bronchi