Comprehension
Based on the context given below, answer the following questions:
Glycine is most often used as a buffering agent in biochemical experiments. This diprotic amino acid has a pKa value of 2.4 owing to carboxyl group and 9.6 owing to amino group. Glycine can exist as a zwitterion which can exist in either protonated form\((NH^+_3 )\) or as a free base \((-NH_2)\)because of the reversible reaction:
Glycine is most often used as a buffering agent in biochemical experiments. This diprotic amino acid has a pKa value of 2.4 owing to carboxyl group and 9.6 owing to amino group. Glycine can exist as a zwitterion which can exist in either protonated form\((NH^+_3 )\) or as a free base \((-NH_2)\)because of the reversible reaction:
Question: 1
The characteristic pH, at which the net electric charge is zero, achieved at
The characteristic pH, at which the net electric charge is zero, achieved at
Updated On: Mar 18, 2024
- 2.4
- 6.0
- 7.5
- 9.6
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The Correct Option is B
Solution and Explanation
The correct option is(B): 6.0
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Question: 2
In 0.1 M solution of glycine at pH 9.0, what fraction of glycine has its amino group in \(-NH^+_3\)form?
In 0.1 M solution of glycine at pH 9.0, what fraction of glycine has its amino group in \(-NH^+_3\)form?
Updated On: Mar 18, 2024
- \(\frac{4}{5}\)
- \(\frac{1}{5}\)
- \(\frac{4}{6}\)
- \(\frac{5}{6}\)
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The Correct Option is A
Solution and Explanation
The correct option is(A): \(\frac{4}{5}\)
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Question: 3
Glycine is highly conserved amino acid because
Glycine is highly conserved amino acid because
Updated On: Mar 18, 2024
- it allows polypeptide chain to make turns
- it exists as zwitterion
- its a-carbon is bonded to four different groups
- it induces polarity
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The Correct Option is A
Solution and Explanation
The correct option is(B): it allows polypeptide chain to make turns
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Top Questions on pH value
- The ionic product of water at 40 °C is \( 2.92 \times 10^{-14} \, \text{M}^2 \). The pH of water at 40 °C is __________ (rounded off to 2 decimal places).
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- If pH of rain water is less than ____ ,then it is called acid rain.
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(A) The pH of unpolluted natural rain water is ~5.6
(B) \(H_2SO_4\) and \(HNO_3\) are predominat acids in acid rain
(C) Acidic rainwater have pH less than 5.6
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(E) Neutral pH of unpolluted natural rain water is 7
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