Mole percent (G+C) of DNA is useful for determining relatedness at the ________ level.
A. class
B. kingdom
C. genus
D. None of the choices are correct.
Answer: C
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The structure designated by the letter "A" in
the above figure is called a. pyloric sphincter. b. esophagus. c. mucosa. d. duodenum. e. none of these.
What will happen to a plant cell if placed in a hypertonic solution?
a. The cell will swell slightly. b. The cell will undergo lysis. c. The cell will become crenated. d. The cell will remain unchanged. e. The cell will undergo plasmolysis.
Most broad-spectrum antibiotics act by
A) inhibiting the synthesis of the cell wall. B) inhibiting protein synthesis. C) inhibiting nucleic acid synthesis. D) inhibiting metabolic pathways. E) disrupting the cytoplasmic membrane.
What can you conclude from the fact that the bones of the winged animal are found in the same fossil bed as the rodent bones?
A) The winged animal interacted with the small rodents when they were both alive, for example, the winged animal may have preyed on the rodents. B) Because it has bones, the winged animal is either a bird or a bat. C) The winged animal is closely related to the small rodents. D) The winged animal lived at the same time as the small rodents.