How do scientists distinguish between gram-positive and gram-negative bacteria?

1 answer:

7 0

3)Add iodine (1 min)
4)acid/alcohol wash (1 min)
5)Flood with safranine (1min)
6)Air dry and examine.

These times are for clinical microbiology and experimental methods employ optimal and more precise times (but overall its pretty close).

Down side of this method is that you must smear bacteria onto the slide and fix it by heating the underside of the slide with a bunsen burner. if they are pink then you have gram negative (Gram's stain didnt stick) if its purple then its gram positive(Gram's stain did stick) This is due to the peptidoglycan layers. Gram negative bacteria have only a thin layer of peptidoglycan as part of the cell membrane/wall where Gram positive have a very think peptidoglycan layer.Source(s):Medical Microbiology

You might be interested in

Factory part of cell membrane

rusak2 [61]

Mitochondria is the 'factory' or the 'powerhouse' of the cell! I've just been learning about them too!

6 0

3 years ago

It is the chance or probability that a person will harmed or experience an adverse health , effect if one is exposed to hazard

vampirchik [111]

Answer:

D. Risk

Explanation:

RISK can be seen as a tendency or likelihood that a person or an individual may encounter, faced or be exposed to something that may be harmful or have an adverse health effect on such person Example a house that has a foundation that is not strong is an hazard reason been that their is likelihood or tendency that a person or an individual might be harmed if the house collapsed because the foundation of the building is not strong for the building to stand long on it without collapsing.

5 0

3 years ago

Insulin causes the body's cells to uptake amino acids. a. True b. False

bekas [8.4K]

Answer is: a. True.
The overall effect of insulin is to lower blood glucose and amino acid levels by promoting their cellular uptake and incorporation into glycogen and proteins, respectively. The net effect of insulin is to decrease blood glucose and amino acids and stimulate the cellular uptake of these molecules and their incorporation into polymers.
Insulin is a peptide hormone produced by beta cells of the pancreatic islets.

4 0

3 years ago

A 2006 genetic study of a large American family (Ikeda et al., 2006) identified a genetic linkage between DNA markers on chromos

nirvana33 [79]

Answer:

Yes

Explanation:

This is solely because a lod score for SCA5 and marker A is >3.0, so it indicates statistical significance.

3 0

4 years ago

PLEASE HELP I have no clue what to do with that. Will Mark Brainliest. Thank You. (:

Irina-Kira [14]

Answer:

Determine whether the trait is dominant or recessive. If the trait is dominant, one of the parents must have the trait. Dominant traits will not skip a generation. If the trait is recessive, neither parent is required to have the trait since they can be heterozygous.

Explanation:

7 0

2 years ago