Bacteria in the phylum Firmicutes are distinguished from the phylum Actinobacteria on the basis of
A) their Gram stain reaction.
B) the high G + C content of their DNA.
C) their spiral shapes.
D) the low G + C content of their DNA.
E) the presence of LPS in their membranes.
D
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Various techniques have been developed to isolate strains of bacteria carrying a particular mutation. One of them is, bacteria containing wild-type cells and cells of a desired mutant are grown on a medium lacking the nutrient for which the desired mutants are auxotrophic but containing an antibiotic that only kills growing cells. In this environment,
A. both wild-type and mutant cells are killed. B. both wild-type and mutant cells survive. C. wild-type cells survive; mutant cells die. D. wild-type cells die; mutant cells survive. E. only double mutants survive. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the bacteria? How does it relate to the question? · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The most common leukocyte in the blood is
a. a lymphocyte. b. an eosinophil. c. a basophil. d. a neutrophil.
What happens when coleoptiles are illuminated with directional light from the side instead of from directly overhead?
A. Auxin is transported toward the lighted side. B. More auxin is produced. C. Less auxin is produced. D. Auxin receptors are activated. E. Auxin is transported away from the lighted side.
During the observations of a species of blue moon butterflies on the Samoan islands of Upolu and Savaii,
99% of the butterflies were originally female and only 1% were male but in only five years the male:female sex ratio had returned to nearly the expected 1:1. What caused this? a. The tendency for Wolbachia to kill male butterflies changed. b. Evolutionary changes in the butterflies allowed the butterflies to suppress the male-killing ef-fect of Wolbachia. c. A and B. d. Neither A nor B.