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Question 6 (1 point) Saved Most microbes grow best at a pH between4.0 to 6.0_5.0 to 6.5_6.5 to 8.5_8.5 to 10....

Question

Question 6 (1 point) Saved Most microbes grow best at a pH between4.0 to 6.0_5.0 to 6.5_6.5 to 8.5_8.5 to 10.

Question 6 (1 point) Saved Most microbes grow best at a pH between 4.0 to 6.0_ 5.0 to 6.5_ 6.5 to 8.5_ 8.5 to 10.



Answers

What is a generally minimum pH for growth and toxin production by Clostridium botulinum and other foodborne pathogens? a) 8.5 b) 7.0 c) 6.5 d) 4.5 e) 2.0

Most spoiled bacteria can't grow below an A. W. Of what? No 0.3 9.5. No 0.9 war. So this is a w is water activity. It's how much water is available. It's not going to be one because one is pure water and of course we heard below one. So it's not one but it's actually quite high. Still the answer is d it has to be Above. About 9.9 bacteria don't cope well in very dry conditions. Um But this allows most fresh food. Most fresh food food is above 9.98. Look below 9.9 you won't find many bacteria. One exception but it's worth remembering is staphylococcus which can grow as low as 9.86. And if we go away from bacteria, fungi can grow as low as 9.8. But in general, No .9 is a good cut off.

For this question, we are looking at the pH requirements for certain bacteria to grow. And for this question we have a bacterium that grows at a ph of 4.5. So the best way to relate this is to consider ph along a scale With seven being in the middle indicating a neutral solution. Any ph above seven will be considered alkaline or basic, And any ph below seven is considered a city. And this is because of the way that we measure ph and related to the hydrogen concentration in a solution. So the equation we use for measuring the concentration of those hydrogen ions is 10 to the negative pH. So if we have a ph of zero, this is the same as 10 to the negative zero concentration of hydrogen ions, Which would be a one molar solution. Whereas at a ph of 14, this is equivalent to 10 to the negative 14th moles per liter of hydrogen ions in the solution. So, here for this organism, we specifically have this ph of 4.5. So this is going to be an organism that likes an acidic environment, which is not surprisingly because we call this organism lactobacillus acidophilus acid, meaning this acid environment and Phyllis for less meaning loving. So here the terminology we use for this organism that loves the specific environment is very similar to the species name of this organism. So we call these organisms a set of files, meaning they love the acid environment. So here you should fill in the blank with a cinephile.

For this question were being asked about organism naming based on the ph at which they grow at. So we have a range of a pH scale With its centered around a ph of seven which is considered neutral. Anything above seven is considered alkaline And anything below seven is considered acidic. And this is because the way we measure ph is this is going to determine the concentration of protons or hydrogen ions inside of a solution. So our hydrogen concentration is actually equal to 10 to the negative ph. So here, the reason our acids have a low number is because say we have a ph of zero. This would be the same as 10 to the negative zero, which would be equal to one moller. So this is a measure of one mole of hydrogen ions per leader of fluid. Whereas for our alkaline ph is say we have a ph of 14, this is going to be equal to 10 to the negative 14th Mueller solution of hydrogen ion. So there's going to be less protons present in an alkaline solution and more protons present in an acidic solution. So specifically for this question, we have a ph of 10.5. So this is going to be in this alkaline range. So for the terminology, we used to name organisms that like this alkaline environment, we're going to take this alkaline prefix. So we are going to call these al callen and we're going to stick on the suffix phile, meaning loving. So this is an organism that we would call an al calla file and in some textbooks you may also see it as alkaline a file. However, for this question, you should fill in the blank with this term here of al calla file.

So we're looking at a bacterium lactobacillus but grows best at Ph 4.5. So bacteria prefer particular environments. Okay, we can see ph is 4.5 which means it's an acidic environment is acidic. Listen seven page and notice but it doesn't just tolerate this ph it grows best. This is an asado fight, take it. And this particular example lactobacillus. This is an important commence cell bacterium in humans. So you will find this bacterium possibly in yourself and various regions of the human body of parasitic like the digestive tract, liver, stomach or the vagina. So that's the best. This works best isn't inside the file and in fact it contributes to about acidic environment because it produces lactic acid.


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