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kirill115 [55]
3 years ago
14

Describe the principle of MPN for enumerating bacteria from a natural sample.

Biology
1 answer:
KengaRu [80]3 years ago
5 0

Answer:

MNP stands for the most probable number which is used for finding out the concentration of viable bacteria in a sample. It is commonly used to check the quality of water and its safety. Usually, the presence of fecal coliform bacteria is checked in this test.  

Principle of MNP: The sample which is to be tested is diluted serially and then inoculated into a broth medium containing lactose. If coliforms are present in the tube than it will consume lactose and release acid and gas.

Color change represents acid production and gas trapped in the Durham tube represents the gas production by bacteria. Then the number of tubes at each dilution that showed positive results are compared with standards to determine the most probable number of the bacteria.

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When storm clouds produce lightning and thunder, energy changes to energy and energy.When storm clouds produce lightning and thu
Vadim26 [7]

Answer:

Electric potential energy to radiant energy and sound energy.

Explanation:

At the time of lightning, it is known that the clouds are at high electric potential and the surface of the Earth is at low potential. Because of this potential difference, the particles of the charge in the atmosphere possesses the capability to mediate from high potential to low potential.  

At the same time, the presence of moisture and certain dipole gases in the atmosphere will possess the capability to show dissociation and because of this dissociation and movement of charge, the process of lightening takes place. Thus, here the electric potential energy of the charged particles will get modify and it will get transformed into sound energy, as it generates sound as well as the radiant energy at the same time in the form of lightning.  

5 0
3 years ago
Many individuals suffer from atherosclerosis, an arterial disease that effects large to medium-sized muscular arteries. What doe
Leviafan [203]

Answer:

It reduces the diameter of an artery

Explanation:

<em>Atherosclerosis results in the deposition of plaques on the arterial wall. The plaque deposition narrows the diameter of the artery and consequently interferes with the flow of blood through the artery in the process. </em>

Hence, atherosclerosis functions by reducing the diameter of an artery due to plaque deposition.

4 0
3 years ago
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During gamete formation, each allele of a pair for a gene moves to separate gametes. Which principle is indicative of this state
TiliK225 [7]
Think about the actual physical process happening in the cell - the allele (or versions of a gene) are literally physical pieces of DNA strung together into chromosomes. And as the cell divides to form gametes, those chromosomes randomly assort themselves into the two new cells (conditional that each new cell gets one copy of each chromosome, in the case of gametes)...<span>
</span>
6 0
4 years ago
Which of the following is NOT a principle of the cell theory?
eimsori [14]

Answer:

a

Explanation:

7 0
3 years ago
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The epithelium lining the stomach, small intestine, and most of the large intestine is simple columnar; the epithelium in the or
Gemiola [76]

Answer:

Both statements are true.

Explanation:

The simple columnar epithelium is characterized by presenting a single layer of cylindrical cells, with the basal and oval nucleus. This type of epithelium is found throughout the entire digestive epithelium, mainly on surfaces with high absorption power such as the walls of the small intestine, but they are also found on secretory surfaces such as the stomach walls, in the gallbladder, in some sections of the collecting tubes of the kidney, in the uterine tube (where it is ciliated) and in the uterus itself.

Squamous Stratified Epithelium is made up of basal cells that are cuboidal or columnar and metabolically active and superficial cells are flattened (squamous). Its function is to protect the underlying tissues in areas subject to nuclei abrasion, this epithelium (not keratinized) forms the wet surfaces of the basal esophagus, oral cavity and vagina. The oropharynx and the pharynx itself are lined by a stratified squamous epithelium as well.

5 0
4 years ago
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