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Biotechnology and Biomedical Engineering
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Biochemistry Virtual Lab I
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Titration Curves of Aminoacids
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Titration Curves of Aminoacids
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Theory
Procedure
Self Evaluation
Animation
Assignment
Reference
Feedback
NPTEL Video
1)
The pK1values of glycine is:
2.34
2.5
3.4
9.6
2)
The amino acid histidine is a ________.
Diprotic acid
Triprotic acid
Simple amino acid
None of the above.
3)
Amino acids are amphoteric because they can function as _________.
polar or a nonpolar molecule
acid or a base
neutral molecule or an ion
transparent or a light-absorbing compound
standard or a nonstandard monomer in proteins
4)
The pI of an amino acid having pK1 = 2.5 and pK2 = 4.9 is:
2.7
3.7
4.8
3.5
5)
If the net charge of an amino acid under physiological conditions is negative, then the amino acid is a ___________.
Acidic
Basic
Neutral
None of the above.
6)
Based on the Henderson-Hasselbalch equation, at what point is the pH of a weak acid equal to its pKa?
25% dissociation
50% dissociation
75% dissociation
100% dissociation
0% dissociation
7)
The isoelectric point of an amino acid is 6.0. If the amino acid is dissolved in a buffer of pH 7.0 it will
have a net positive charge
be electrically neutral
have a net negative charge
have no negatively charged groups
none of the above
8)
At pH=PKa -1 the ionizable species will be:
90% dissociated
10% dissociated
50% dissociated
100% dissociated
9)
If the pKa of an acid is less, the acid will be:
Weak acid
Strong acid
10)
At the equivalence point the species will be in
Equal proportion
Unequal proportion
Fully protonated
Fully deprotonated
11)
The pH of a sample of blood is 7.4. The pH of a sample of gastric juice is 1.4. The blood sample has _________.
5.29 times lower [H+] than the gastric juice
6 times lower [H+] than the gastric juice
6000 times lower [H+] than the gastric juice
A million times lower [H+] than the gastric juice
0.189 times the [H+] as the gastric juice
Cite this Simulator:
vlab.amrita.edu,. (2012). Titration Curves of Aminoacids. Retrieved 17 February 2025, from vlab.amrita.edu/?sub=3&brch=63&sim=1336&cnt=3
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