Most of the tests you performed involved a color change to the media or the bacterial cells due to a change in pH and the presence of a pH indicator. What metabolic process was most often involved in the observed color changes?

Acid production

Explanation:

Most bacteria make by-products during multiplication. Bacteria that undergo lactic acid and acetic acid production via a process called fermentation will produce an acid. If there is an indicator in the media that would react with these acids the color change will appear. This will give the scientist an indication that a by product has been made and the pH of the by product is low.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.