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levacccp [35]
1 year ago
11

Can a pure culture containing a single type of microbe be prepared from a culture with a mixture of cells? explain your reasonin

g?
Biology
1 answer:
Arada [10]1 year ago
4 0

Pure culture can be prepared from a mixture of cultures by using the streak plate method. This enables the bacterial cells to be diluted to obtain a pure culture after many-folds dilution.

Pure culture is the one in which only one species, strain or clone of bacteria are grown. The pure culture enables to scientists to study in detail about its anatomy, lifestyle and potential uses or harms, without the interference of any other microbe.

Streak-plate method is the most commonly used technique in microbiology labs to isolate a single type of bacteria. It is performed by creating the smears of bacteria in zig-zag motion to dilute its concentration.

To know more about pure culture, here

brainly.com/question/21512552

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When is the lac operon most active?
Vera_Pavlovna [14]

Answer: The correct answer to the question is option WHEN GLUCOSE LEVELS ARE LOW AND LACTOSE IS PRESENT.

Explanation: To start with,Lac operon can be simply defined as a part of the DNA that is under the part of the DNA is manipulated and controlled by the same promoter,they can be found in some prokaryotic cells giving room for regulation over excess synthesis of protein.so simply put,these specific segment of the DNA binds with the segment of the polymerase of RNA so that transcription of the mRNA from the operon genes will be achieved.

Lac operon is also known as lactose operon, it is seen in some enteric bacteria like e.coli where they play a crucial role in coding of genes for those proteins that function in moving lactose into the cystocel and digesting it to form glucose that is used for energy generation. These lac operon are are most active when glucose levels are low and lactose is present,with the low level of glucose, the lac operon can be transcribed to a high level,this is to ascertain that the bacteria only gets to activate the lac operon and can only make use of it,that is using lactose when all the preferred energy source from glucose has been exhausted.

6 0
3 years ago
A person with type A blood (AO) is crossed with
riadik2000 [5.3K]

Answer:

25% type A, 25% type B, 25% type AB, 25% type O

If you put it into a punnett square:

          B                  O

A        AB                 AO

O       BO                 OO

you get 25% for each phenotype

7 0
2 years ago
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Leto [7]

Answer:

the ocean provides several important resources to its inhabitants

Explanation:

The majority of biomass in any ocean consists of microscopic organisms such as phytoplankton which are pivotal to aquatic ecosystems. These microorganisms are able to thrive in their habitat due to incredibly dense populations of the bacteria <em>phackingyurmom aquatica </em>present in most oceans. These bacteria provide a wide spectrum of vital nutrients. As a result many of the aforementioned microorganisms love <em>phackingyurmom</em>.

3 0
3 years ago
The organisms native to an area will impact the types of soil found in that area.
7nadin3 [17]

Answer:

True!

Explanation:

The development of soils can be significantly affected by vegetation, animal inhabitants, and human populations. Hope this helps!

5 0
3 years ago
Metamorphic rocks tend to show the same properties as the rocks they were formed from Question 3 options: True False
Ede4ka [16]
False because wen metamorphic rocks form they change there shape and they ether get bigger or smaller
6 0
3 years ago
Read 2 more answers
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