An atom with twelve electrons, twelve protons, and fourteen neutrons has a mass number of
A. fourteen.
B. twenty-four.
C. thirty-eight.
D. twenty-six.
D. twenty-six.
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The Gram-negative chlamydiae are ________.
A. motile due to periplasmic flagella B. Gram-positive, spore-forming rods C. photosynthetic D. obligate intracellular parasites
As early as the 1940s, researchers knew that bacteria could be grown in a minimal medium. In this
minimal medium the most common source of organic carbon is:
a. peptidase. b. glucose. c. rubisco. d. catalase. e. ammonium chloride.
What process allows bacteria to absorb external organic matter across the cell wall?
a. Exoenzyme b. Osmosis c. Mitosis d. Osmotrophy
Which of the following is NOT a characteristic of mammals?
A. They have a two-chambered heart. B. They are endothermic. C. They have lungs. D. They have an amnion. E. They have a skeletal system composed of bone.