1
JEE Advanced 2014 Paper 1 Offline
Numerical
+3
-0
The total number of distinct naturally occurring amino acids obtained by complete acidic hydrolysis of the peptide shown below is
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2
JEE Advanced 2013 Paper 1 Offline
Numerical
+4
-0
The total number of lone-pairs of electrons in melamine is
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3
JEE Advanced 2013 Paper 1 Offline
Numerical
+3
-0
A tetrapeptide has $$-$$COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with $$-$$NH2 group attached to a chiral center is _______.
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4
IIT-JEE 2012 Paper 1 Offline
Numerical
+3
-0
The substituents R1 and R2 for nine peptides are listed in the table given below. How many of these peptides are positively charged at pH = 7.0 ?
| Peptide | $${R_1}$$ | $${R_2}$$ |
|---|---|---|
| I | H | H |
| II | H | $$C{H_3}$$ |
| III | $$C{H_2}COOH$$ | H |
| IV | $$C{H_2}CON{H_2}$$ | $${(C{H_2})_4}N{H_2}$$ |
| V | $$C{H_2}CON{H_2}$$ | $$C{H_2}CON{H_2}$$ |
| VI | $${(C{H_2})_4}N{H_2}$$ | $${(C{H_2})_4}N{H_2}$$ |
| VII | $$C{H_2}COOH$$ | $$C{H_2}CON{H_2}$$ |
| VIII | $$C{H_2}OH$$ | $${(C{H_2})_4}N{H_2}$$ |
| IX | $${(C{H_2})_4}N{H_2}$$ | $$C{H_3}$$ |
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Questions Asked from Biomolecules (Numerical)
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