The sixth amino acid in normal hemoglobin is

glutamate, but it is replaced by __________ in
sickle-cell anemia.
a. histidine
b. proline
c. leucine
d. valine
e. threonine


Answer: d

Biology & Microbiology

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Which of the following statements regarding the loss of biodiversity is false?

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The first plant to colonize the plains of Mt St

Helens after this volcano erupted in 1980 was a prairie lupine. The prairie lupine is an example of

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Vials of microorganisms that undergo the freeze-drying process, called ________, will remain preserved and viable for years.

A. sterilization B. pasteurization C. desiccation D. lyophilization E. flash freeze

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