A man comes to his physician complaining of drowsiness and a desire to sleep. He is suffering from tremors. He has just returned from central Africa. His physician believes that he may be suffering from a disease caused by Trypanosoma brucei, variety gambiense. If so, he has been bitten by a:
a. tsetse fly
b. "kissing bug"
c. mosquito
d. tick
Ans: a. tsetse fly
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The movement of actin and myosin fibers in a muscle contraction contains all of the following steps except
A. the myosin head returns to its original conformation. B. the globular myosin head detaches from the actin filament. C. the myosin head attaches to the actin filament. D. the myosin filament advances relative to the actin filament. E. myosin rolls up from one end, forming a ball.
In a temperate rain forest, primary productivity remains relatively constant
Indicate whether the statement is true or false
The stacking of thylakoid membranes into grana decreases the surface area for photosynthesis.
a. true b. false
What part of a lipid can be converted to DHAP during lipid catabolism and then enter the glycolysis pathway?
A. Glycerol B. Amino acids C. Fatty acids