Why is it important to stain youngcultures of bacteria with the grain stain?

Biology

1 answer:

uranmaximum [27]3 years ago

8 0

Answer:

Because older cultures of gram-positive bacteria tend to lose their ability to retain crystal-violet in the peptidoglycan of their cell walls and can be confused with gram-negative bacteria.

Explanation:

Gram staining is used to differentiate between two major groups of bacteria. Gram-positive and gram-negative, these bacteria differ in the amount of peptidoglycan in their cell walls. Gram-positive bacteria have a higher amount of peptidoglycan, which absorbs the violet crystal complex used in gram staining, staining them purple/violet. Old cultures of gram-positive bacteria tend to lose the ability to retain the violet crystal and are stained by safranine, staining them red/pink and appear to be gram-negative.

You might be interested in

The ventral branches of the spinal nerves form complex networks called plexuses. the _____ plexus supplies the muscles and skin

ankoles [38]

I believe the answer would be The musculocutaneous nerve innervates the flexor muscles of the arm, including the biceps brachii and brachialis muscles. ... Along the anterior of the forearm, the median and ulnar nerves supply nerve signals to the skin and to the flexor musclesof the hand and fingers.

5 0

3 years ago

List and describe the four types of micro-organisms that cause disease

kherson [118]

Virus: an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.
Bacteria: a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some which can cause disease.
Fungi/fungus: any of a group of spore-producing organisms feeding on organic matter, including molds, yeast, mushrooms, and toadstools.
Protozoa: a phylum or group of phyla that comprises the single-celled microscopic animals, which include amoebas, flagellates, ciliates, sporozoans, and many other forms. They are now usually treated as a number of phyla belonging to the kingdom Protista.

7 0

2 years ago

A pond contains 1000 fish of which have been tagged. You catch 10 fish. How many of the fish would you except to be tagged

maw [93]

Answer:

the answer is 990 fishes

8 0

2 years ago

How is the scientific method used in earth science (it was due yesterday)

Bingel [31]

Answer: The steps used in scientific methods are to ask a question, form a hypothesis, test the hypothesis, analyze the results, draw conclusions, and communicate results. A controlled experiment tests only one factor at a time so that scientists can determine the effects of changes to just that one factor.

6 0

2 years ago

Read 2 more answers

The endosymbiotic theory proposes that eukaryotic cells arose from

LUCKY_DIMON [66]

From several more prokaryotic cells.

4 0

2 years ago