Once infected with Trypanosoma brucei, the patient's immune system cannot clear the infection and develop immunity because the parasite
A) has flagella that allow it to travel all over the body.
B) matures into infectious trypomastigotes.
C) reproduces by binary fission.
D) changes its glycoprotein surface antigens every time it replicates.
E) invades the central nervous system.
D
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The control in an experiment
a. makes the experiment valid. b. is an additional replicate for statistical purposes. c. reduces the experimental errors. d. minimizes experimental inaccuracy. e. allows for comparisons to the experimental group.
The emergence of many diverse species from a common ancestor that finds itself in a new environment is called
A) adaptive radiation. B) gradualism. C) disruptive selection. D) allopatric speciation. E) hybridization.
Phospholipids contain two different parts: a ________ head and a pair of ________ tails
Fill in the blank(s) with correct word
M. xanthus has an alternate motility type, known as ________ motility, because it is exhibited by single cells that leave the group, perhaps scouting for prey and requires a multiprotein motility "machine."
Fill in the blank(s) with the appropriate word(s).