A patient, Jennifer, presents in an emergency room (ER) with severe stomach cramps and diarrhea. She was recently swimming in unclean water. Which protist would be the most likely cause of her symptoms?
A. Leishmaniasis
B. Plasmodium
C. Giardia
D. Toxoplasma gondii
Answer: C
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Three critical amino acids in the active site of an enzyme are leucine, tryptophan, and alanine. Which of the following characteristics would you predict the substrate to possess in order to bind the active site of this enzyme?
A. relatively hydrophobic B. hydrophilic, with a negative charge C. hydrophilic, with a positive charge D. hydrophilic, but without a charge
Which of the following situations would be MOST likely to produce a new species?
A. A new group of polyploid individuals arises by an abnormal mitosis and can only reproduce with each other. B. Several individuals join an existing population and introduce new alleles to the population. C. Several individuals colonize a new area but continue to migrate back to the original colony to reproduce with the ancestral population. D. An existing species becomes subdivided by the effects of a glacier and the resulting groups remain physically isolated from each other for thousands of years; when united they are still able to reproduce between groups. E. A volcano erupts and kills all of the frogs on an island. New frogs colonize the island and begin reproducing rapidly because there are no predators.
The plant hormone that promotes dormancy in
some plants and seeds is a. abscisic acid. b. auxin. c. gibberellin. d. ethylene. e. none of these.
Which scientist was first credited for observing the cell nucleus?
a. Theodor Schwann b. Anton van Leeuwenhoek c. Matthias Schleiden d. Robert Brown