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sergeinik [125]
3 years ago
5

A test is considered to be reliable if _

Social Studies
1 answer:
Tasya [4]3 years ago
6 0
I think the answer is if it is done 3 times, because that will make sure you're correct.
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If you subcultured a microbial colony by transferring some of the cells into a tube of sterile nutrient broth, would the new cul
podryga [215]

1. Samples of a microbial colony obtained from the natural environment are not pure culture. They are mixed cultures because the environment consists of an array of microorganisms and not one specific organism. A sample obtained from the natural environment such as water or soil may contain several species of microbes that need to be further isolated to obtain a pure culture.  

2. Isolation streak plate technique involves the dilution of the sample several folds and then streaking a small amount using a sterile inoculation loop on an agar plate in a zig-zag manner. This is done to obtain a pure culture of bacteria from a mixed population by separating the microprocessor. When the sample is diluted into a small concentration and is streaked onto agar placed, widely spaced, discrete colonies of bacteria can be observed. These isolated colonies can be further cultured to obtain pure cultures by picking and re-streaking them on fresh agar plates.

3. A microbial colony is considered a pure culture because it consists of single species. A single species of bacteria cluster and form an isolated colony on an agar plate which can be further plated on fresh medium.

3-1 - If your agar plate shows discrete uncluttered colonies then you have obtained an isolated colony. The following picture might help you to understand.

3-2. If you subculture isolated microbes into a sterile nutrient broth without any contamination, it will still be considered pure culture because it is single isolated species in a sterile aseptic environment of the nutrient broth.

3.3. A pure culture can become a mixed culture due to contamination. This could be caused by airborne bacteria if your conditions are not aseptic. Contamination is possible if the work area is not clean and sterile or if the glassware is not sterile. The contamination can transform your pure culture into a mixed culture and is hence problematic. So, it is very important to maintain a sterile and aseptic environment, glassware, and instruments.

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8 0
2 years ago
What effect did the treaty of Versailles have on Germany?
FrozenT [24]

Answer:

Germany's army was limited and they have to pay reparations

Explanation:

8 0
2 years ago
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When child abuse is suspected, the least appropriate nursing action is to
grandymaker [24]

Answer:

A

Explanation:

7 0
3 years ago
Very few work relationships are based on _______ trust as compared to other types of trusts. Select one: a. competence-based b.
stich3 [128]

Answer:

The correct option is: d. affect-based trust

Explanation:

Affect-based trust is the type of trust that is heavily dependent on the emotional feelings of an individual towards the other individual. This type of trust is based upon the personality or character traits of the individual rather than logical reasoning. The affect-based trust is built on the  social emotional bond that goes beyond the work or professional relationship between the partners.  

8 0
3 years ago
The conflict between Israel and Egypt over the Sinai Peninsula is an example of boundary change through __________.
Aleks [24]
The conflict between Israel and Egypt over the Sinai Peninsula is an example of boundary exchange through territoriality. The Sinai peninsula has been part of Egypt from the First Dynasty of ancient Egypt. Israel invaded and occupied Sinai during the Suez Crisis of 1956, and during the Six-Day war of 1967.
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3 years ago
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