Which step in the Gram stain is the critical step in differentiating gram-positive cells from gram-negative cells?
A) safranin
B) alcohol-acetone
C) iodine
D) crystal violet
B
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DNA probes have been very useful in
A. coding the DNA of organisms grown in vivo. B. identifying organisms in pure culture. C. detecting toxins. D. diagnosing diseases of protozoa.
Identify and briefly describe the two phyla of seedless vascular plants. Include one or two
representatives of each phylum. What will be an ideal response?
DNA encoding a normal gene is inserted into cells from a patient with a defective form of the gene. Recombinant cells are identified and isolated, and returned to the patient's body. This is an example of
A) gene therapy. B) genomics. C) genetic mapping. D) genotyping. E) biotechnology.
The carbon atoms in organic compounds typically form ________ with other atoms.
A. nonpolar covalent bonds B. polar covalent bonds C. ionic bonds D. hydrogen bonds E. either ionic or hydrogen bonds