Answer:
Petri plates are incubated upside down to prevent contamination.
Explanation:
The plates are always incubated inverted or turned upside down on their covers during storage. This is done to prevent evaporation if plaque is stored for long periods, which can affect the growth efficiency of bacteria, or allow contamination by multiplying unwanted organisms such as mold.
Once the plaques have been filled with a damp suspension of bacteria, it should be allowed to evaporate shortly before overnight incubation. However, a moderate amount of moisture will still be present. If plaque is not inverted during incubation, bacteria will not be able to attach to the culture medium properly, which will either prevent them from growing and forming colonies properly or will encourage the growth of undesirable microorganisms.
Any of these results will invalidate the experiment. In addition, any condensation or moisture can cause streaking, which will make it difficult to select and analyze separate colonies. After bacteria form colonies, plaque is also stored upside down to maintain moisture levels.
1. <span>The three basic elements common to all novels are character, mood and plot. The answers to your question are A, D ane E.
2. </span>A clause that modifies a noun or pronoun is an <span>adjective clause. The answer to your question is A.
3. </span>The three schools of playwriting that Wilder combined in Our Town are expressionism, realism and symbolism. The answers to your question are A, B and E.
4. <span>A main clause that can stand alone or function as a whole sentence is an </span>independent clause. The answer to your question A.
I hope that this is the answer that you were looking for and it has helped you.
Around the world the most significant restriction on access to potable water is money. While access to raw water sources, clean or otherwise, is important, the purification process itself is expensive.
Hello!
Your answer is "C. Rain forests are cleared to graze cattle..."
Hope this helps! ^^
~Dukuccino<span>♡</span>
Answer:
Lithosphere is the name of the solid part of Earth, including rock, minerals, and metals.
