A positive (susceptible) reaction for the ______________ test is ______________.
A. P disk, > 14mm zone of inhibition
B. Novobiocin, <16mm zone of inhibition
C. A disk, no zone of inhibition
D. 6.5% NaCl no growth
Ans: A. P disk, > 14mm zone of inhibition
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Consider the following experiment. First, large populations of two mutant strains of Escherichia coli are mixed, each requiring a different, single amino acid. After plating them onto a minimal medium, 45 colonies grew
Which of the following may explain this result? A) The colonies may be due to back mutation (reversion). B) The colonies may be due to recombination. C) Either A or B is possible. D) Neither A nor B is possible.
True or false? _____ Mutations always result in negative effects on the organism. _____ Mutations are always large-scale (e.g., involving at least 10,000 base pairs of DNA)
DNA). _____ Mutations are never large-scale (e.g., involving at least 10,000 base pairs of DNA). _____ Most mutations are caused by an environmental pollutant. _____ Mutation rates are constant in all organisms. _____ Mutation rates are higher in men than in women because men have higher metabolic rates than women. _____ Mutation occurs every time a cell divides. _____ All mutations provide genetic variation on which evolution may act. What will be an ideal response?
Alveoli are the respiratory surfaces of birds
Indicate whether the statement is true or false.
Guttation results from:a
water pressure. b. transpiration pull. c. osmotic pressure. d. root pressure. e. sink-to-source transport