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Ulleksa [173]
4 years ago
12

What is positive controls used for?

Biology
1 answer:
Katen [24]4 years ago
7 0
A positive control is a group in an experiment that receives a treatment with a known result, and therefore should show a particular change during the experiment. It is used to control for unknown variables during the experiment and to give the scientist something to compare with the test group.
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A food contains 28 g carbohydrates, 2.7 g protein, and 0.3 g fats. How many calories does the food provide?
Tasya [4]
A carbohydrate will provide 4 kcal/g, protein also 4kcal/g, but fat is 9 kcal/g. In this case, there are 28g carbohydrates, 2.7g protein, and 0.3g fat. Counting it separately, it will be:
Carbohydrate: 28g * 4kcal/g  = 112kcal
Protein            : 2.7g * 4kcal/g =   10,8 kcal
Fat                  : 0.3 * 9kcal/g   =     2.7 kcal

Total calorie= 112+10.8+2.7= 125.5 kcal
4 0
3 years ago
How can we generate energy without fossil fuels?
Natali5045456 [20]

Answer:

Biomass is a plant that operates a similar gas and coal-fired plants. Instead of burning fuel this plant is fueled by (different biomass like growing trees,wood chips,biogad,etc)

Ex: In 2017 ,biomass generated 2.3% of the world's electricity

Hope this helps !

4 0
3 years ago
The same, unknown bacteria is isolated from 20 sick individuals. Their samples were grown in culture and then placed in 10 healt
AleksAgata [21]
<h2>Koch's Postulates.</h2>

Explanation:

The next step should be isolate the microorganism from the mice and check if it is identical to the original microbe.

According to Koch's postulates, a microbe can be considered as a causative agent of a disease only after all the following are established:

  • The microorganism should be present in all the organism suffering from the disease.
  • The isolated microorganism should be grown in pure culture.
  • The organism grown in the culture should be reintroduced in the susceptible but healthy host.
  • Finally the microorganism must be re-isolated from the experimental host an cultured to see whether it is identical to the original specific microorganism.

4 0
4 years ago
Read 2 more answers
What cell structure is responsible for regulating all cellular activities?
Phantasy [73]

Answer:

Let me know if this is right Answer: Nucleus

Explanation:

This organelle known as the Nucleus has two major functions: it stores the cell's hereditary material, or DNA, and it coordinates the cell's activities, which include growth, intermediary metabolism, protein synthesis, and reproduction (cell division). Only the cells of advanced organisms, known as eukaryotes, have a nucleus.

5 0
3 years ago
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Which statement describes a histogram?
DedPeter [7]

Answer:

c

Explanation:

8 0
3 years ago
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