Chagas disease is caused by:
a. Trypanosoma rangeli.
b. Trypanosoma cruzi.
c. Trypanosoma brucei rhodesiense.
d. Trypanosoma brucei gambiense.
B
T. cruzi, which belongs to the family Schizotrypanum and is confined to the American continent, produces A6merican trypanosomiasis (Chagas disease).
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Within the peptidoglycan layer, the crossbridges that connect the chains of alternating sugar molecules extend between _______ .
a) two N-acetylmuramic acid molecules b) an N-acetylmuramic acid and an N-acetylglucosamine c) two glucose molecules d) two N-acetylglucosamine molecules
The distance between two linked genes on a chromosome is determined by the recombination frequency between the genes
1.True 2.False
If water were nonpolar it would not form hydrogen bonds. At normal room temperatures this nonpolar water would be ________.
A. a liquid B. a solid C. a gas
It's the ninth inning, and the bases are loaded. As the pitcher winds up to throw the ball, how does each tissue in his arm contribute to this critical pitch? The ________ of his fingers grips the ball. His ________ sends instructions that trigger his ________ to contract. His ________ provides stability and transmits the force produced.
A. epithelium; ectoderm; mesoderm; endoderm B. ectoderm; ectoderm; mesoderm; endoderm C. connective tissue; nerve tissue; muscle tissue; epithelial tissue D. epithelial tissue; nerve tissue; muscle tissue; connective tissue