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:
Fiscal policy refers to the measures employed by governments to stabilize the economy, specifically by manipulating the levels and allocation of taxes and government expenditures. Fiscal policy relates to the decisions which determine whether a government will spend more or less than it receives.
Fiscal policies are influenced by the executive and legislative branch of a country.
Explanation:
One of the ways the executive branch influences fiscal policy is that the President and the Secretary of the Treasury directs the fiscal policies of the United States. Since the fiscal policy is tied into each year's federal budgets, the President proposed this budgets to be approved by the Congress.
One of the ways the Legislative branch influence fiscal policy is that the approve the Federal budget proposed by the President. In United States, Congress passes laws and appropriates spending for any fiscal policy measures. This process involves participation, deliberation and approval from both the House of Representatives and the Senate.
Monetary policy refers to the policy undertaken by the monetary authority of a country to control money supply in order to achieve macroeconomics goals which in turn promote sustainable economic growth. Monetary policy reduces liquidity to prevent inflation.
Reasons why the Federal Reserve Board is given independence in establishing monetary policy are
1. They are free from short term legislative/executive pressures. Without the degree of autonomy, the Federal Reserve Board could be influenced by election focused politicians into enacting an excessively expansionary monetary policy to lower unemployment in the short term. Tho could lead high inflation.
2. They Federal Reserve Board runs a technocrat appointment rather than a political appointment. The monetary decision of the Federal Reserve Board is not ractified by the President. They receive no funding by the Congress and members of the Board of governors who are appointed, serve 14-year term. This terms do not coincide with presidential terms, thus making them further independence.
Overall, technology is not the end-all be-all of sustainability, but it is a tool that can be used to effectively create larger amounts of communication and collaboration, and clearer sets of information.
Answer:
Farmer
Explanation:
Product was food, cattle, etc
The thing that convinces scientists that current warming trends are not solely part of Earth's natural cycle is B. The current changes are happening much faster than past changes.
<h3>Who is a scientist?</h3>
It should be noted that a scientist simply means someone who studied science and researches in science.
In this case, the thing that convinces scientists that current warming trends are not solely part of Earth's natural cycle is that the current changes are happening much faster than past changes.
In conclusion, the correct option is B.
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