Which one of the following molecules would MOST likely require a transport protein to cross the plasma membrane of a red blood cell?

a. H2O
b. CO2
c. O2
d. C6H12O6


Ans: d. C6H12O6

Biology & Microbiology

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Which type of microscopy enhances and amplifies slight changes in the phase of transmitted light?

A) differential interference contrast microscopy B) digital video microscopy C) fluorescence microscopy D) phase-contrast microscopy E) both choices A and D

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Individuals from different subspecies usually interbreed where their geographic distributions meet

Indicate whether the statement is true or false.

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Today's atmosphere on Earth is made up of nitrogen, oxygen, carbon dioxide, and water. According to all models, which of these was largely absent 3.8 billion years ago?

A) oxygen B) nitrogen C) carbon dioxide D) water

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What is the main product of the light-dependent reactions of photosynthesis?

A. ATP B. Chlorophyll C. Glucose D. Citric acid

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