Suppose you perform a Gram stain of a mixed culture of Gram-positive and Gram-negative cells, and afterwards you realize that you omitted the iodine step. What would you expect to see if you observed the slide under the microscope?

a. colourless Gram-positive and pink Gram-negative cells
b. purple Gram-positive and pink Gram-negative cells
c. pink Gram-positive and pink Gram-negative cells
d. colourless Gram-positive and colourless Gram-negative cells


Ans: c. pink Gram-positive and pink Gram-negative cells

Biology & Microbiology

You might also like to view...

________ formation begins with the initial colonization of the pellicle by Streptococcus gordonii, S. oralis, and S. mitis.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

If an object were collected on Mars by the rover Curiosity, it would be considered a living organism if it ________

A) responded to environmental stimuli B) had metabolic activities and maintained homeostasis C) contained DNA and reproduced D) All of the above are true.

Biology & Microbiology

What is the process that occurs inside cells that produces long strands of amino acids?

A. Cellular respiration B. Protein synthesis C. Exocytosis D. Membrane transport

Biology & Microbiology

What happens to glutamic acid 35 and aspartic acid 52 at the end of the reaction?

A.) both amino acids are restored to their original forms B.) glutamic acid is deprotonated and negatively charged C.) lysozyme is destroyed and recycled as the product is released D.) aspartic acid has formed a covalent bond with the first sugar

Biology & Microbiology