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skelet666 [1.2K]
2 years ago
15

Which best describes the difference between physical and chemical changes

Biology
1 answer:
Doss [256]2 years ago
5 0

Answer:

ExA physical change is a change from one state of matter to another; a chemical change results in a new substance formed. A chemical change does not result in a new substance being formed, whereas a physical change does.planation:

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If a cell culture has 3 x 105 cells per ml , and the culture flasks hold 75 ml of culture each and you have 12 flasks, how many
natta225 [31]

There are 27 x 10⁷ cells in total for the given conditions of cell culture.

Since it is given that the cell culture contains 3 x 10⁵ cells per ml and there are 12 culture flasks in total. It is also given that each of the culture flask holds 75 ml of culture.

Therefore, to calculate the total capacity of the flasks the total number of flasks should be multiplied with the individual capacity of a flask:-

75 x 12 = 900 ml

Now, in order to calculate the total number of cells in the given culture., the total capacity of the flasks i.e. 900 ml should be multiplied with 3 x 10⁵ cells per ml in the following manner:-

900 x (3 x 10⁵) = 2700 x 10⁵ = 27 x 10⁷ cells

To learn more about cell culture here

brainly.com/question/1005896

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4 0
1 year ago
In the gram stain procedure the primary stain crystal violet function toA) stain only the thinner peptidoglycan cell wallsB) sta
Andre45 [30]

Answer:

B) stain only the thicker peptidoglycan cell walls

Explanation:

Gram staining is a technique which was developed by the Hans Christian Gram in 1884 to distinguish the bacterial strains. Based on the colour absorbed and retained by the bacteria, the bacteria are distinguished either as gram-positive or gram-negative.

He used a colour stain- crystal violet which is a positive dye and binds to the cell wall made of peptidoglycan. The crystal violet binds to the cell wall with the help of a mordant called iodine. If this dye retains inside and the cell appears purple then the cell is considered gram-positive else negative.

Thus, Option-B is correct.

3 0
2 years ago
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Discuss mechanisms of disease transmission and processes of infectionss
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Diseases have multiple ways of infiltrating your body. Diseases can be transported through blood, air, and physical touch. Once the disease has infiltrated the body, it can spread through out the body in many ways. One of which is by feeding off of other cells energy and reproducing. The pathogens travel through the blood and irritate cells. The irritation of cells can cause the body to consume more energy, to repair the damage. This causes symptoms like tiredness, regurgitation, and sometimes in extreme cases, death. 
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Modern inventions and discoveries:
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Answer:

B

Explanation:

Your welcome mate! :)

8 0
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What are the two types of nucleotides
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There are two groups of bases: Pyrimidines: Cytosine and Thymine each have a single six-member ring.
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3 years ago
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