How many different "lines" of antibiotics against TB are there?
A. four
B. five or more
C. one
D. two
E. three
Answer: D
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Which of the following structures constitute the carpel of a flower? Select all correct choices
A. ovary B. anther C. style D. stigma E. stamen
The presence of which of the following antibodies usually indicates a recent or an active infection?
a. Immunoglobulin (Ig) G b. IgA c. IgM d. IgE
When two organisms do not mate because they breed at different times of the year, they are exhibiting ____
reproductive isolation.
a. behavioral b. ecological c. gametic d. mechanical e. temporal
In the late 1950s, some women were prescribed a teratogen to relieve symptoms of morning sickness. This drug caused abnormal limb development in the children of these women. What was this drug?
A. acetaminophen B. acutane C. erythromycin D. thalidomide E. penicillin