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

Biology

1 answer:

uranmaximum [27]4 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

A couple has three children, two without sickle cell anemia and one with sickle cell anemia. The mother has sickle cell anemia a

bezimeni [28]

Answer:

Explanation:

The sickle cell allele is recessive. Hence, in order for any child of the couple to have sickle cell anemia, such a child will have to inherit an affected allele each from the two parents. This means that both the father and the mother must have affected alleles in their genotypes. In other words, two sickle cell alleles are required for the abnormality to manifest.

Let us assume that the sickle cell allele is represented by S and the normal allele is represented by A.

Now, it is established that the mother has sickle cell anemia, her genotype would be SS. The father does not have sickle cell, his genotype can either be AA or AS.

Assuming the genotype of the father is AA:

SS x AA

AS AS AS AS

All the children would be normal in this case.

Assuming that the genotype of the father is AS

SS x AS

AS SS AS SS

50% of the children would have sickle cell while the remaining 50% would be normal.

Therefore, in order to produce children with sickle cell, the father has to be AS, otherwise, he has to be AA.

6 0

3 years ago

You are a clinical psychologist and you have a 14-year-old female client who you believe has bulimia nervosa (binging and purgin

Rudiy27

I think it is called a Case study.

Hopefully it is correct! :)

7 0

3 years ago

Cobalamin, more commonly called vitamin b12,

TiliK225 [7]

C. is essential in the synthesis of dna and in the development of red blood cells.

5 0

3 years ago

After a successful launch and return of a rocket, NASA and SpaceX noticed a strange gel like substance on the wing. Under the mi

wariber [46]

nonliving the heat from the hot plate is causing the gel like substance to move it's the same thing with liquid nitrogen how it seems to bounce off the floor it's because liquid nitrogen is super cold and the heat basically excites the electrons in the liquid nitrogen making it bounce off the floor same with the gel like substance the electrons in the gel substance are getting excited by the heat and jumping up and down but the substance itself is not alive

6 0

3 years ago

Barry is a vegan. his diet does not include foods that contain preformed vitamin a, and he does not take any vitamin a supplemen

katen-ka-za [31]

What’s your question?

7 0

3 years ago