Answer: B. Hydrolysis (adding water)
Explanation:
When peptide bonds join two or more amino acids together, this is refered to as a peptide. A polypeptide simply means several amino acids. We should also note that proteins contains polypeptides.
The reaction that is capable of breaking polypeptides into their component amino acids is hydrolysis. This simply means a chemical process whereby a water molecule is being added to a particular substance.
C. Weak acids partially ionize
Answer:

Explanation:
Hello,
In this case, the first step is to compute the volume of the block considering the length, height and width:

Then, we compute the volume in cubic centimetres:

Finally, as the density is given by:

We solve for the mass:

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Answer:
The pH of a solution is a measure of the concentration of hydrogen ions in the solution. A solution with a high number of hydrogen ions is acidic and has a low pH value. A solution with a high number of hydroxide ions is basic and has a high pH value. The pH scale ranges from 0 to 14, with a pH of 7 being neutral.
To be honest the answer should be B. Hope this help.