Which of the following is not true of the gram’s staining procedure?

A) It works for all bacteria
B) The stain used is crystal violet
C) It differentiates between gram-positive and gram-negative bacteria
D) Some bacteria lose the stain by decolorization
E) An iodine solution is used


Answer: A) It works for all bacteria

Biology & Microbiology

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Which type of RNA carries the code from the DNA to the site where the protein is assembled?

a. messenger RNA b. nuclear RNA c. ribosomal RNA d. transfer RNA e. structural RNA

Biology & Microbiology

Activities that disrupt the production of melatonin at night also may cause ____

a. heart disease b. cancer c. increasing gonadal output d. pancreas reduction e. too much sleep

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Which of the following cells are activated by the release of interleukin-10 from the helper T cells?

A) cytotoxic T cells B) B cells C) natural killer cells D) macrophages E) mast cells

Biology & Microbiology

The best way to distinguish an epigenetic effect from other types of gene regulation would be to

A. determine that the change in gene expression is not heritable. B. confirm that the change in gene expression is paternally inherited. C. confirm that the change in gene expression is passed from cell to cell but does not involve a change in the DNA sequence. D. identify the specific base-pair changes in the DNA sequence causing changes in gene expression patterns as being substitutions only. E. determine that any change in gene expression can be reproduced via environmental stimuli.

Biology & Microbiology