The pairing of homologous chromosomes occurs during which of the following?
a. mitosis
b. meiosis I
c. meiosis II
d. All of these are correct.
b. meiosis I
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Compared to the sunflowers, birch trees are:
A. r-selected. B. K-selected. C. less competitive. D. All of the responses are correct. E. None of the responses is correct.
Hexachlorophene has been particularly effective against
A. Staphylococcus aureus. B. Micrococcus aureus. C. Escherichia coli. D. Enterobacter aerogenes.
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What will be an ideal response?
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. wild-type cells die; mutant cells survive. B. wild-type cells survive; mutant cells die. C. both wild-type and mutant cells survive. D. only double mutants survive. E. both wild-type and mutant cells are killed.