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Flauer [41]
2 years ago
14

You dilute an original sample 1:30. You then count the number of yeast in the 1:30 dilution. You count an average of 7 cells in

the 1/25 mm2 sized boxes. What is the concentration, in cells/ml, of the original sample?
Biology
1 answer:
kompoz [17]2 years ago
6 0

Answer:

The concentration, in cells/ml, of the original sample is 52500 cells/ml

Explanation:

Given

- Average number of cells in 1/25 mm^2 sized box (considering 1 box) is 7

- The depth of each box of a hemocytometer is 0.1 mm

To find the Volume:

Volume = 1/25 mm^2 * 0.1 mm^3 = 0.004 mm^3

Concentration of cells in this volume

[Cells in the estimated volume] = 7/0.004 mm^3 = 1750 cells/mm^3.

Knowing 1 mm^3 = 1 ml,

cell count = 1750 cells/ml.

Using the dilution factor 1:30 to correct the calculation

Final cell count after correction =  1750* 30 = 52500 cells/ml

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ddd [48]

Answer:

Biotic: Plants

Abotic: Rocks

Explanation:

A biotic factor is something in an ecosystem or environment that is living. Some examples that could be found in a park are grass, flowers, trees, squirrels, pigeons, fish or people.

An abiotic factor is the exact opposite of a biotic factor: something in an ecosystem or environment that is not alive. Some examples that may be found in a city park include a park bench, a trash can, rocks, a playground, a pool, basketball court, temperature, and humidity.

5 0
3 years ago
The ability of one person to produce over a million different antibody molecules does not require over a million different genes
Tema [17]

Answer:

DNA rearrangment.

Explanation:

Genetics can be defined as the scientific study of hereditary in living organisms such as humans, animals and plants.

The human somatic cell is made up of 46 chromosomes which are sub-divided into 22 pairs of autosomes and a pair of sex chromosomes (X and Y). An autosome is one of the numbered chromosome that is typically not a sex chromosome.

On the other hand, sex chromosomes (X and Y) are responsible for determining the gender or sex of living organisms such as humans.

Deoxyribonucleic acid (DNA) is an organic complex-molecular structure found in all living organisms. It comprises of genes and is essentially the foundation block of all living organisms such as humans, animals and plants.

DNA rearrangment can be defined as a process which typically involves re-writing the informations contained within a Deoxyribonucleic Acid (DNA) into a Ribonucleic Acid (RNA) by enzyme RNA polymerase.

Hence, the ability of an individual to produce over a million different antibody molecules doesn't require the use of over a million different genes; rather, this wide range of antibody production is due to deoxyribonucleic acid (DNA) rearrangment.

6 0
2 years ago
What mechanisms are in place in a stream ecosystem to make sure that the populations of biotic elements are controlled and inter
Kipish [7]
In any ecosystem, there are factors to control populations.
In a stream, the predators of a certain organism will help keep populations checked. Moreover, the limited resources, such as space and food, will keep the population from growing out of control.
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