Melvin Calvin and his colleagues used which of the following to deduce the steps in the Calvin-Benson cycle?
A) negative staining
B) Drosophila melanogaster
C) electron microscopy
D) ultracentrifugation
E) radioisotopes
E) radioisotopes
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Eyes are
a. chemoreceptors. b. mechanoreceptors. c. photoreceptors. d. nociceptors. e. none of these.
Which of these statements about hypertension is
false? a. Blood pressure remains above 140/90 even at rest. b. Poor diet and lack of regular exercise puts one at increased risk. c. It may contribute to atherosclerosis. d. Most Americans with the disorder seek treatment. e. It tends to run in families.
Phages are being considered for:a
vectors in gene therapy experiments. b. antibiotics in bacterial infections. c. gene transfer vectors in animal cells. d. being equivalent to the first living organisms. e. All of the above
Which of the following observations best indicates that living things evolved in different time periods?
a. Extinct organisms found only as fossils were destroyed in global catastrophes. b. Layers of rock are deposited in a slow, gradual process. c. Species in a location resemble one another more than species in another location. d. Fossil A always appears in a layer below fossil B. e. In many parts of the world, a rock layer of type A always appears below a rock layer of type B.