The pH is a measure for the acidity (or basicity) of a solution. It is defined as the negative logarithm of the activity of the hydronium ion of a solution.

learn more… | top users | synonyms

1
vote
0answers
21 views

Effects of pH vs membrane potential within a cell? [closed]

How are these two concepts related? Does changing each result in the same effects? As in: what kind of reactions/processes would be affected if we changed the pH within a cell? Would the results ...
1
vote
1answer
20 views

How do you calculate the charge on a polypeptide chain with changing pH?

I understand the charge placement on the N & C-terminus and also the utilization of the R-side groups in the amino acids. For example, What is the overall charge for a chain Glu-Cys-Arg-Asp with ...
17
votes
1answer
223 views

Why do you die if you cannot breathe?

I was wondering what the actual reason for death by suffocation is. Obviously it is related to oxygen deprivation. But what is the underlying cause of death? Is it due to insufficient oxygen for ...
2
votes
1answer
40 views

Blood pH at Higher Altitudes

My Campbell's Biology Textbook says the following: "For example, when an elk or other mammal moves up into the mountains from sea level, physiological changes that occur over several days ...
0
votes
0answers
39 views

pH concentrations during photosynthesis

I'm studying for an AP Bio exam and had the following question: Which of the following parts of an illuminated plant cell would you expect to have the lowest pH? (A) Stroma (B) Cytosol ...
1
vote
1answer
73 views

What are the metabolic concerns associated with hard water?

If humans can maintain a consistent blood pH, then what problems does alkalized water cause us? Why is it recommended that we filter and boil hard water? Is the issue that hard water can affect the ...
2
votes
1answer
278 views

Does pH affect Michaelis constant?

I have been trying to confirm the Km of a substrate (which is 34 +/- 4 mM). This value was obtained in 50 mM MOPS, pH 6.3. I conducted my kinetics assay in a buffer of pH 7 and obtained a Km value in ...
1
vote
1answer
49 views

Is there a biological environment that we can we assume glutamate exists as glutamic acid?

In the body we almost always assume that glutamate exists as glutamate rather than glutamic acid. It is so commonly glutamate yet glutamic acid and glutamate share the abbreviations of Glu and E. From ...
2
votes
1answer
71 views

How do I prepare a solution? (Calculation) [closed]

I have to make 100mL of 400mM NaOH. How do I go about calculating what I need to prepare this?
3
votes
3answers
3k views

Why does pH have an effect on enzymes?

I am currently studying biology and have a question about how pH affects enzymes. When the pH gets closer to the enzyme's pH optimum, the enzyme activity also increases. I would like to know why? ...
3
votes
1answer
545 views

What are the highest and lowest possible pH, paCO2 and HCO3 in the blood of living human?

What are the highest and lowest possible values of pH, $paCO_2$, and $HCO_3$ in the (arterial or venous) blood of a living human being?
3
votes
1answer
104 views

How do fish tolerate pH changes in water?

I want to know how aquatic animals behave as a natural indicator of the acidity in lakes and rivers. How do they tolerate these pH change?
1
vote
1answer
248 views

Effect of pH on life? Use buffer or HCl? How about lactic acid?

I'm trying to find the effect of pH on living things like E. coli and such. At first I thought of using a buffer solution which maintains its level of pH, but it's possible that the inactive ions of ...
2
votes
1answer
121 views

How Do Acid and Base Loving Plants Get Enough PO4?

Acidic and Basic soils experience phosphate sequestration through binding with either calcium, aluminum, or iron. How do plant that thrive in acidic and basic soils obtain the necessary phosphate? ...