Two weeks after a backpacking trip in Tennessee, a hiker experienced flu-like symptoms and noticed a red rash on his thigh. What is the cause of his illness?
A) Treponema pallidum pertenue
B) Borrelia burgdorferi
C) Borrelia recurrentis
D) Leptospira interrogans
Ans: B) Borrelia burgdorferi
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What change does binding of the sperm membrane to the oocyte membrane elicit?
a. The oocyte dispels its nucleus. b. The oocyte begins cleavage. c. The oocyte completes meiosis II. d. The sperm returns back to the oviduct. e. The sperm releases a polar body.
When the product of reaction A becomes the reactant of reaction B, this exemplifies a ________ metabolic pathway.
A. divergent B. cyclic C. bidirectional D. convergent E. linear
Denitrification in Marine Dead Zones
What will be an ideal response?
Which molecule consists entirely of protein?
a. ribosomal large subunit b. peptidyl transferase c. aminoacyl-tRNA synthetase d. ribosomal small subunit