Gram-positive bacteria are colored purple by the Gram stain because:

a. they have circular DNA molecules called plasmids that repel the stain.
b. they have a capsule that lies outside the cell wall.
c. they have a layer of glycoprotein called peptidoglycan outside of the cell membrane.


Answer: c. they have a layer of glycoprotein called peptidoglycan outside of the cell membrane.

Biology & Microbiology

You might also like to view...

In flowering plants, one sperm nucleus fuses with an

egg nucleus, and a zygote forms that develops into an embryo. Another sperm nucleus a. fuses with a primary endosperm cell to produce three cells, each with one nucleus. b. fuses with a primary endosperm cell to produce one cell with one diploid nucleus. c. fuses with the endosperm mother cell, forming a primary endosperm cell with a single triploid nucleus. d. fuses with one of the endosperm mother cell nuclei to produce a diploid tissue that serves as the food supply for the embryo. e. degenerates.

Biology & Microbiology

When blood levels of cortisol rise above the set

point, secretion(s) of __________ is (are) slowed. a. CRH b. ACTH c. TSH d. STH e. CRH and ACTH

Biology & Microbiology

The ________ zone is a range of environmental temperatures within which homeothermic metabolic rates are minimal

Fill in the blank(s) with correct word

Biology & Microbiology

Shrinkage of the plasma membrane away from the cell wall when the bacterium is placed in a hypertonic environment is called ________.

A. hypertonolysis B. osmolysis C. plasmolysis D. hydrolysis

Biology & Microbiology