The first eukaryotic fossils are dated to about
a. 3.8 billion years ago.
b. 2.1 billion years ago.
c. 1.5 billion years ago.
d. 750 million years ago.
e. 201 million years ago
B
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Plastids are storage organelles. A chloroplast is a type of plastid. What does a chloroplast store?
A. Chlorophyll B. Oxygen C. Carbon D. Sugar
One of the important reasons for maintaining biodiversity is to
A. prevent loss of habitats that can be logged or farmed at some future date. B. prevent loss of habitat leading to edge effects. C. prevent introduction of invasive species. D. maintain the genetic diversity of wild relatives of common crops. E. prevent increased disease spread due to edge effects.
Atoms that gain or lose electrons become charged particles called ________.
A. cations B. anions C. isotopes D. ions
Which of the following is not true of industrial microbiology?
A. Growth environment is enhanced to increase metabolite synthesis. B. Select microbial strains are not controlled by feedback mechanisms. C. Secondary metabolites include amino acids. D. Primary metabolites are essential to a microbe's function.