Movement of oxygen and carbon dioxide between alveoli and blood occurs by what process?
A) osmosis
B) simple diffusion
C) facilitated diffusion
D) primary active transport
E) secondary active transport
Answer: B) simple diffusion
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Broad, ecologically uniform areas with stable and distinctive collections of species are called ____
Fill in the blank with the appropriate word.
Which of the following statements about the auxin indole-3-acetic acid (IAA) is false? a. It is involved in polarity and tissue patterning in the embryo
b. IAA can exert different effects at different concentrations. c. IAA is made mainly in root tips and young roots. d. It causes cells to expand by increasing activity of proton pumps.
Vaccination takes advantage of
a. the immune system. b. the skin as a barrier. c. injecting materials from lesions. d. delivering virus via bacteria. e. all of these.
Which method is rapid and economical in terms of materials, but requires a certain degree of skill to master the technique.
A) Streak-plate method B) Loop dilution (pour plate) method C) Spread-plate method