1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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.

You might be interested in
Which form of succession replaces<br> an<br> existing system after a calamity?
lina2011 [118]

Answer:

Secondary succession

Explanation:

Ecological succession is the term used to describe any series of change in the composition of an ecosystem over a particular period of time. Ecological succession is made up of two types viz: primary succession and secondary succession.

Primary succession involves the formation of a brand new ecosystem by the colonization of a barren area of land e.g bare rock, where no life existed. Secondary succession, on the other hand, is the recolonization of an area by a new set of organisms because the previously existing organisms have been wiped out by certain disasters e.g fire outbreak, hurricanes etc. In secondary succession, there is soil, which makes it possible for new organisms to sprout quickly after the calamity.

Example of secondary succession is when a fire outbreak burns the organisms in a community, allowing the root of grasses to sprout after.

5 0
3 years ago
Which statement describes the relationship between the deer and plants on the food web? Tree is consumed by insect, which is con
True [87]

Answer: A.  Autotrophs supply food for the heterotrophs.

Explanation: A deer is a heterotroph and a plant is a autotroph. Examples of heterotrophs are animals and humans, and examples of autotrophs would be plants and algae. Therefore, because a deer consumes plants that means that autotrophs supply food for the heterotrophs. And by the way I did the exam myself and got this answer correct!

8 0
3 years ago
I have asked this question 3 times and people keep taking the points :(
Verizon [17]

Answer:

When 2 slabs of continental lithosphere collide, it creates mountains.

Explanation:

3 0
2 years ago
PLEASE HELP!!!!!<br><br><br><br> What happens during human reproduction?
marissa [1.9K]

Answer:

A baby is made

Explanation:

The sperm cell (from the man) and the egg cell (from the woman) combined, makes Zygote, the Zygote converts into the Embryo, and the Embryo converts into the Baby.

Hope this helped!

Have a supercalifragilisticexpialidocious day!

3 0
2 years ago
Read 2 more answers
Thyroid gland and prostate gland are located at?
Sergio [31]

The anterior part of the lower neck, below the larynx (voice box).

7 0
3 years ago
Read 2 more answers
Other questions:
  • Supertasters are much more sensitive that non-taters to all but which one of the foods listed below?
    8·1 answer
  • most common reason for decompensation of previously well-compensated heart failure during dental treatment?
    11·2 answers
  • What do we call a genetic cross that follows two separate characters, such as pea seed color and pea seed shape?
    12·1 answer
  • What is the role of restriction enzymes in studying the human genome?
    15·2 answers
  • the amount of energy released and the amplitude of seismic waves are measured by the scale known as *NEED ANSWER NOW*
    15·1 answer
  • 11. The behaviors and physical characteristics of
    6·1 answer
  • 1. Explain what is the "Sea Floor Spread" with examples.
    7·1 answer
  • Question
    15·1 answer
  • Make an argument for a "critical period" in language acquisition.
    10·1 answer
  • Someone help with this pls thank you .
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!