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3 years ago

Select all that apply. Ground water pollution can be caused by _____.

1 answer:

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Man-made products such as gasoline, oil, road salts and chemicals get into the groundwater and cause it to become unsafe and unfit for human use

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Please explain why the inoculated plates are inverted during incubation.

sasho [114]

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.

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3 years ago

Carbon dioxide would be classified as:

laila [671]

<span>B is the correct answer. Carbon dioxide is a compound of two elements, carbon and oxygen. There are two oxygen molecules for every carbon molecule in the compound. </span>

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3 years ago

Read 2 more answers

Which statement describes decomposers?

steposvetlana [31]

The statement “Decomposers are those organisms that recycle matter in the ecosystem” describes decomposers. Decomposers are organisms that break down dead or decaying organisms, and in doing so, they carry out the natural process of decomposition.

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3 years ago

Unlike the somatic nervous system, the autonomic nervous system A. regulates voluntary activities. B. is part of the motor divis

konstantin123 [22]

Answer: C consists of a sympathetic and parasympathetic nervous system

With the Autonomic Nervous System (ANS) the bodily actions are done without thinking or being controlled, which occurs with the internal organs such as the heart beating, digestion, sexual arousal, and other functions that can't be controlled.

Hopefully this helped and good luck!!!

7 0

3 years ago

Read 2 more answers

A researcher had 15 purebred wikl mice which were brown and all females, they were all mated with a male called Bob, All offspri

cestrela7 [59]

Complete question:

A researcher had 15 pure-bred wild mice which were brown and all were females. They were all mated with a male called Bob. All the offspring were brown. These were then crossed among themselves with the following results: 293 brown and 115 white.

(i). Determine the color of Bob.

(ii). Determine which color is dominant.

(iii). Work out the ratio of brown to white in the ‘grandchildren.’

(iv). If the researcher crosses two of the white 'grandchildren', determine the color of their offspring.

Use the Punnett square to work out your answers

Answer:

(i). Determine the color of Bob. BOB IS WHITE

(ii). Determine which color is dominant. BROWN IS DOMINANT

(iii). Work out the ratio of brown to white in the ‘grandchildren.’

PHENOTYPIC RATIO BROWN TO WHITE 3:1

(iv). If the researcher crosses two of the white 'grandchildren', determine the color of their offspring. THE WHOLE PROGENY WILL BE WHITE

Explanation:

Due to technical problems, you will find the complete question, answer, and explanation in the attached files.

Download pdf

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3 years ago