If a mixture of bacteriophages, some labeled with radioactive sulfur and others labeled with radioactive phosphorus, is placed in a bacterial culture, the bacteria will eventually contain ____.
A. primarily radioactive sulfur
B. primarily radioactive phosphorus
C. both radioactive sulfur and phosphorus
D. neither radioactive sulfur nor radioactive phosphorus
E. complete viruses with radioactive sulfur coats
Answer: B
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A team of researchers is studying the external structures on the dorsal (back) surface of a spider mite. The spider mite seems to be the habitat of an even smaller mite, which is approximately 0.05mm. While they can see the dorsal surface of the spider mite with their naked eye, they cannot see the mite clearly. The researchers are writing a grant to provide support for a microscope to use to study these new mites. They need to purchase a microscope with a high magnification to observe the new mites on their habitat. Based on the information given, what type of microscope would you suggest?
A. scanning electron microscope B. no microscope is powerful enough to see the smaller mite C. binocular compound light microscope D. transmission electron microscope
Structurally, which type of neuron has many processes associated with the cell body?
The typical lesion of tertiary syphilis is
A. a generalized rash. B. gummas in bones, in nervous tissues, or on the skin. C. a painless reddened lesion called a chancre at the site of infection. D. purulent sore throat. E. the development of buboes in the lymph nodes at the site of infection.
The largest number of food servings in your daily diet should be from
(a) meats and beans. (b) dairy products. (c) vegetables and fruits. (d) grains.