Which of the following best describes the double-helix of DNA?
A. It has directionality
B. The strands are arranged in an anti-parallel arrangement
C. The strands are complementary
D. All of the answers are correct
D
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Magnetosomes are
A. responsible for the heat resistance of endospores. B. composed of magnetic iron oxide particles. C. found in all bacteria and some archaea. D. infoldings of the cell membrane. E. also termed metachromatic granules.
Which protist clade (supergroup) is characterized by their greatly modified mitochondria?
a. excavates b. unikonts c. rhizarians
d. archaeplastids e. chromalvolates
If a friend was taking large doses of vitamin C prescribed by a doctor, you might suspect that your friend was suffering from ?
A. pellagra B. rovkets C. pernicious anemia D. beriberi E. scurvy
A culture medium made of extracts from yeasts, meat, or plants is a ________ medium.
a) complex b) selective c) differential d) chemically defined