leu- bacteria are mixed in a flask with leu+ bacteria, and soon all bacteria are leu+. However, if the leu- cells are on one side of a U-tube, which is divided into two compartments by a filter with fine pores, and the leu+ cells are on the other, the leu- cells do NOT become prototrophic. Which process is likely to produce this observed result?
A. transduction
B. transfection
C. transformation
D. reciprocal translocation
E. conjugation
Ans: E. conjugation
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Which of the following is not one of the four tissue types?
A. muscle B. nervous C. epithelial D. connective E. squamal
Compare and contrast the metabolic diversity of bacteria in one of the two groups below.A. Obligate anaerobes, facultative anaerobes, and aerobes
B. Autotrophic and heterotrophic bacteria
What will be an ideal response?White fruit color in summer squash is influenced by a dominant allele W, whereas colored fruit must be ww. In the presence of ww, a dominant gene G results in yellow fruit, and homozygous gg results in green fruit. The F2 phenotypic ratios resulting from a cross of a true-breeding plant with white fruit (genotype WW GG) with a plant with green fruit will result in which phenotypic ratios?
A. 8/16 white, 4/16 yellow, 4/16 green B. 12/16 white, 3/16 yellow, 1/16 green C. 4/16 white, 8/16 yellow, 4/16 green D. 12/16 white, 2/16 yellow, 2/16 green E. 8/16 white, 8/16 green
Aerotolerant anaerobes ________.
A. synthesize superoxide dismutase, but not catalase B. synthesize both superoxide dismutase and catalase C. synthesize catalase but not superoxide dismutase D. synthesize neither superoxide dismutase nor catalase