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sesenic [268]
3 years ago
11

If we have a plate that has 2500 colonies on it, can we use this plate to calculate CFU's

Biology
1 answer:
AleksAgata [21]3 years ago
6 0

No, the solution with bacteria in it needs to be diluted in order to be in the range of 30 – 300.

A colony-forming unit –CFU is used to estimate the number of viable (ability to divide by binary fission) microbes in a sample.  

A sample of microbes is diluted and spread on a plate. Then, the number of colonies is counted, assuming that each colony have grown from a single colony-forming unit, or CFU.

Plates with more than 300 colonies are difficult to count while those with less than 30 colonies give statistically unreliable numbers of colonies to count.

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PFK can be allosterically inhibited by ATP at high concentrations. Which of the following is the benefit of regulating glycolysi
melamori03 [73]

Answer:

The principle benefit of regulating glycolysis by the concentration of ATP is to signals the cell to stop glycolysis as sufficient amount of ATP is already present in the biological system.

Explanation:

Phosphofructokinase 1 is allosterically inhibited by ATP.Glycolysis is a catabolic as well as exergonic process which deals with the oxidation of glucose to form pyruvate along with ATP molecules.

            When ATP is present at high concentration within our body at that time there is no need to synthesize additional ATP because ATP is already present in sufficient amount.

       To maintain its own homeostasis ATP allosterically inhibit the catalytic activity of phosphofructokinase. As a result glycolysis is inhibited and the glucose molecule can be utilized in other metabolic pathways.

8 0
3 years ago
How do this male peacocks feathers increases fitness?
stepladder [879]

Answer:

Researchers also found that the longer a male's tail feathers, the faster he was able to shake them. This effort would require more muscular strength, and might be a powerful signal of fitness to the females.

Explanation:

6 0
3 years ago
True or false? it is the medical assistant's responsibility to determine whether a patient has an advance directive in place
Mila [183]
The statement above is TRUE.
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Neko [114]
Melting ice caps and glaciers
5 0
2 years ago
10. Deep open currents....
sasho [114]
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

Deep open currents <span>make up 10% of the ocean and are greater than 400 m deep</span>
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