Glucose is absorbed through the membranes of the
small intestine primarily by
a. osmosis.
b. bulk flow.
c. transport proteins.
d. endocytosis.
e. facilitated diffusion.
Answer: c
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Glycoprotein spikes protruding from the outer surface of viral envelopes function as
A. toxins. B. cell lysis factors. C. factors that bind to host cells. D. factors needed for site specific recombination.
If cyanobacteria never evolved during Earth's history, how would this affect the composition of Earth's atmosphere?
A. There would be less nitrogen in the atmosphere. B. There would be less carbon in the atmosphere. C. There would be less oxygen in the atmosphere. D. There would be less methane in the atmosphere. E. There would be less hydrogen in the atmosphere.
Oxygen is toxic to
A) strict anaerobes. B) strict aerobes. C) aerotolerant organisms. D) facultative anaerobes. E) all of the above
The Calvin cycle produces six ATP for every six turns of the cycle
Indicate whether this statement is true or false.