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

Biology & Microbiology

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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. 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.

Biology & Microbiology

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.

Biology & Microbiology

Hexachlorophene has been particularly effective against

A. Staphylococcus aureus. B. Micrococcus aureus. C. Escherichia coli. D. Enterobacter aerogenes.

Biology & Microbiology

Microbiota Comparison Among Animals

What will be an ideal response?

Biology & Microbiology