Question

Bacteria are divided into two groups based on how their _______ absorb stain.

Answer 1

Bacteria are divided into two groups based on how their cell walls absorb stain.
The most prominent bacterial structural characteristic is the cell wall. Bacteria can be divided into two groups (gram-positive and gram-negative) based on differences in cell wall structure as revealed by Gram staining. In a Gram stain, a series of dyes are applied to stain cell walls. Gram-negative bacteria have an outer, lipopolysaccharide-containing membrane and stain pink. They also have a thin peptidoglycan layer located in the periplasm (the region between the outer and cytoplasmic membranes). Gram-positive bacteria lack this covering, but possess a cell wall containing a thick peptidoglycan (called Murein in older sources) layer and teichoic acids; they stain purple. Gram-positive bacteria are more susceptible to antibiotics, while gram-negative bacteria are difficult to treat with antibiotics.

http://www.newworldencyclopedia.org/entry/bacteria

http://www.lhncbc.nlm.nih.gov/lhc/docs/published/2001/pub2001028.pdf

Part of the classification of micro-organisms is still based on external features, such as the shape of bacteria – cocci are spherical, bacilli are rod-shaped bacteria – and whether they are stained by standard techniques or not, e.g., the Gram technique. This leads to four categories: cocci Gram positive, cocci Gram negative, bacilli Gram positive, and bacilli Gram negative.

Answer 2

Bacteria are divided into two groups based on how their cell walls absorb stain.
The most prominent bacterial structural characteristic is the cell wall. Bacteria can be divided into two groups (gram-positive and gram-negative) based on differences in cell wall structure as revealed by Gram staining. In a Gram stain, a series of dyes are applied to stain cell walls. Gram-negative bacteria have an outer, lipopolysaccharide-containing membrane and stain pink. They also have a thin peptidoglycan layer located in the periplasm (the region between the outer and cytoplasmic membranes). Gram-positive bacteria lack this covering, but possess a cell wall containing a thick peptidoglycan (called Murein in older sources) layer and teichoic acids; they stain purple. Gram-positive bacteria are more susceptible to antibiotics, while gram-negative bacteria are difficult to treat with antibiotics.

http://www.newworldencyclopedia.org/entry/bacteria

http://www.lhncbc.nlm.nih.gov/lhc/docs/published/2001/pub2001028.pdf

Part of the classification of micro-organisms is still based on external features, such as the shape of bacteria – cocci are spherical, bacilli are rod-shaped bacteria – and whether they are stained by standard techniques or not, e.g., the Gram technique. This leads to four categories: cocci Gram positive, cocci Gram negative, bacilli Gram positive, and bacilli Gram negative

Answer 3

so the answer is cell walls?