Which of the following may trigger a migraine headache?
a. hormonal changes
b. fluorescent lights
c. certain foods
d. weather changes
e. all of these
E
Biology & Microbiology
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Malaria is caused by ____ species of Plasmodium
a. a single b. two c. three d. four e. five
Biology & Microbiology
A steady, low-level contraction of a muscle is referred to as
a. tetanus. b. treppe. c. spasm. d. tone. e. fatigue.
Biology & Microbiology
What is the current produced by a 9-volt battery flowing through a resistance of 0.2 ohms?
A. 1.8 Amps B. 45 Amps C. 0.022 amps D. 8.8 amps
Biology & Microbiology
A new operon is discovered in bacteria. Transcription of the genes in this operon is blocked by the binding of a protein
to DNA sequences upstream of the operon. This is an example of ____ control. a. positive b. negative c. constitutive d. posttranscriptional e. inducible
Biology & Microbiology