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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Answer:
Music
Explanation:
Music is not an standard academic subject.
<span>Answer: Your insurance policy will likely not cover the damages to your car.
</span>A comprehensive car insurance is a type of car insurance which cover other damages to your car with the exception of collision. Comprehensive car insurance only cover damages that occur as a result of vandalism, disaster, theft, fire, etc,; it does not cover damages due to accident collision.
Answer:
It supports the idea people are hypocritical and unwilling stand up for their beliefs.
The true statement about divided attention in the context of memory encoding is that a divided attention involves concentrating on different activities, one activity at a time.
<h3>What is the meaning of memory encoding?</h3>
Basically, a memory encoding refers to the initial learning of information, that is, its tells us how the information coming from sensory input is changed into a form so it can be stored in the brain. From the word "encoding" which is the transformation of internal thoughts and external events into short term and long-term memory.
A memory encoding entails a process in which the information is processed and categorized for storage and retrieval. It is also the crucial first step in creating a new memory. As well, it also converts the perceived item or event into a construct that can be stored and recalled later from the brain.
Under a memory encoding, the divided attention occurs when the mental focus is on multiple tasks or ideas at once. It is also known as multitasking which most individuals do this all the time.
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