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4 years ago

Describe three circumstances in which pure cultures are essential for the microbiologist

Biology

2 answers:

wel4 years ago

5 0

Answer:

Pure cultures are important in Microbiology for the following reasons:

Once purified, the isolated species can then be cultivated with the only the desired in which microorganism is being grown.

A pure culture can be correctly identified for accurate studying and testing, and diagnosis in a clinical environment.

Testing/experimenting with a pure culture ensures that the same results can be achieved regardless of how many times the test is repeated.

Explanation:

A pure culture is the study of the properties of one particular microbe eliminating extraneaous influences.

A pure culture is defined as growth of a microorganism containing only one cell type.

SVEN [57.7K]4 years ago

4 0

Once purified, the isolated species can then be cultivated with the knowledge that only the desired microorganism is being grown. A pure culture can be correctly identified for accurate studying and testing, and diagnosis in a clinical environment. Testing/experimenting with a pure culture ensures that the same results can be achieved regardless of how many time the test is repeated.

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What is the correct order of cells in the retina from back (furthest from the lens) to front?

ozzi

The human retina is composed of 10 layers. Beginning from back to the front of the retina, the layers include; an epithelium of retinal pigments, a layer of cones and rods, an outer regulating membrane, an outer nuclear layer, an outer plexform layer, an inner nuclear layer, an inner plexform layer, a layer of ganglion cells, a. layer of nerve fibre and an inner regulating membrane.

7 0

3 years ago

Learning Task 2 Write the word true or false if the statement is correct and if false change the underline word or words to make

EastWind [94]

Complete question:

Write the word TRUE if the statement is correct and if FALSE change the underlined word or words to make the statement correct.

_______1. A molecular group consisting of a sugar molecule, a phosphate group and a nitrogenous base is a nucleic acid.

_______ 2. In a DNA molecule, a base pair would be composed of adenine and guanine.

_______ 3. Cytosine and adenine are purines.

_______ 4. During the replication of DNA, bonds are broken between the phosphate groups.

_______ 5. RNA contains the nitrogenous base uracil.

_______ 6. There are 20 different amino acids in a cell.

_______ 7. The coded message carried by messenger RNA is translated into polypeptides at organelles called chloroplasts.

_______ 8. The decoding of a messenger RNA message into a polypeptide chain is known as translation

_______ 9. A severe mutation may lead to cell death and may have no effect on the body.

_______ 10. Most mutation are harmful.

Answer:

False
False
False
False
True
True
False
True
True
False

Explanation:

_False_1. A molecular group consisting of a sugar molecule, a phosphate group, and a nitrogenous base is a nucleic acid.

Nucleotides: subunits or monomers composed of a sugar molecule, joined with a phosphate group and a nitrogenated base. The chain or sequence of nucleotides composes the polymer. Different nucleotides joined by their extremes compose the nucleic acid: DNA or RNA.

A molecular group consisting of a sugar molecule, a phosphate group, and a nitrogenous base is a nucleotide.

_False_ 2. In a DNA molecule, a base pair would be composed of adenine and guanine.

In the DNA molecule, Adenine (Purine) always pairs with Timine (Pyrimidine), while Guanine (Purin) pairs with Cytosine. A-T pair is united by 2 hydrogen bonds, and the G-C pair is united by 3 hydrogen bonds.

In a DNA molecule, a base pair would be composed of adenine and timine, or In a DNA molecule, a base pair would be composed of cytosine and guanine.

_False_ 3. Cytosine and adenine are purines.

Nitrogenated bases that form nucleic acids correspond to purines and pyrimidines. Adenine and guanine derive from purines, while Thymine and Citocine derive from Pyrimidines.

Guanine and adenine are purines.

_False_ 4. During the replication of DNA, bonds are broken between the phosphate groups.

During the replication of DNA, bonds are broken between the hydrogen groups.

_True_ 5. RNA contains the nitrogenous base uracil.

Instead of Timine, RNA contains uracil that pairs with adenine.

_True_ 6. There are 20 different amino acids in a cell.

_False_ 7. The coded message carried by messenger RNA is translated into polypeptides at organelles called chloroplasts.

When mRNA leaves the nucleus, meets a free ribosome in the cytosol. Into this organelle, it starts the protein building. Ribosomes read the mRNA code and begin protein synthesis by adding the correct amino acid using transference RNA.

The coded message carried by messenger RNA is translated into polypeptides at organelles called ribosomes.

__True__ 8. The decoding of a messenger RNA message into a polypeptide chain is known as translation

__True__ 9. A severe mutation may lead to cell death and may have no effect on the body.

_False_ 10. Most mutation are harmful.

A mutation is a change or alteration in DNI sequences that introduce new variants. Many of these are eliminated, but most of them might succeed and be incorporated into each individual. These mutations are the ones that have been selected by natural selection, leading to evolution.

Most mutation are not harmful

5 0

3 years ago

Someone help me with this pls

arlik [135]

You could also say that the neutron is the odd man out because the number of protons and electrons are the same because the negative charge from the electronics attracted to the positive charge from the proton.

On the next line you could say the election is the odd man out because the protons and neutrons reside in the nucleus and the electrons fly at high speeds in the electron cloud.

7 0

3 years ago

I need help pls I don’t understand

Yuri [45]

Answer:

a) (SO4)2 + Ba2 = BaSO4

b) (CO3)2 + 2H = H2O + CO2

c) NH4 + 2Na = Na + 2N + 2H

There u go :D

7 0

3 years ago

What is the approximate time of death if the body temperature was 24°C?

Naddik [55]

Answer:

I think its 1 to 2 days am sorry if am wrong

Explanation:

The equation to solve it is F = C * {9/5} +32

6 0

4 years ago