African sleeping sickness is caused by Trypanosoma brucei, a unicellular, flagellated protist that infects red blood cells after entering the bloodstream. Trypanosoma brucei is which of the following?
A. an alga
B. a protozoan
C. a slime mold
D. a diatom
E. a water mold
Answer: B. a protozoan
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Based on molecular evidence, fungi were present on land at least ____ years ago
a. 1 billion b. 500 million c. 250 million d. 125 million e. 10 million
The Pax6 gene
A. is a master control gene for eye development. B. codes for a protein that controls the expression of many other genes. C. mutant can cause aniridia in humans. D. is a homolog to the eyeless gene in Drosophila. E. All of the choices are correct.
What type of thermal burn is MOST commonly associated with inhalation injury?
A) Steam burns B) Flame burns C) Scald burns D) Arc burns
The conducting zone, or portion of a neuron that sends chemical signals to other cells, is also called the ________
a. trigger zone b. dendrites c. cell body d. axon terminal