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प्रश्न
Explain the primary structure of proteins.
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उत्तर
Primary structure of proteins:
- Primary structure of proteins is the sequence of constituent α-amino acid residues linked by peptide bonds.
- Any change in the sequence of amino acid residues results in a different protein.
- Primary structure of proteins is represented by writing the three-letter symbols of amino acid residues as per their sequence in the concerned protein.
- The symbols are separated by dashes. According to the convention, the N-terminal amino acid residue is written at the left end and the C-terminal amino acid residue at the right end.
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संबंधित प्रश्न
Give scientific reasons:
On boiling egg albumin becomes opaque white.
Write the names and schematic representations of all the possible dipeptides formed from alanine, glycine and tyrosine.
Draw a neat diagram for the following:
Zwitter ion
Draw a neat diagram for the following:
Enzyme catalysis
The optically inactive α-amino acid among the following is _____________
The chemical nature of peptide bond in proteins is ____________
In the process of denaturation, there is NO change in the structure following protein.
Write the structure of Zwitterion of alanine.
Write the number of chiral carbon atoms present in fructose.
Complete the following reaction.
\[\ce{H2N - CH2 - COOH + H2N - CH2 - CH2 - COOH ->[-H2O] ?}\]
Write types of proteins depending upon molecular shape.
Explain denaturation of proteins.
Define α-amino acids.
From the following identify the INCORRECT match with respect to the different structures of proteins.
____________ is NOT a simple protein.
Read the following statements and select the correct option.
- In quaternary structure, the peptide chains are much looped, twisted, and folded back on themselves due to formation of hydrogen bonds.
- When a protein has more than two polypeptide subunits their arrangement in space is called secondary structure.
Identify the option that correctly describes the amphoteric nature of proteins.
Identify 'P' and 'Q' in the following table.
| Proteins | Role |
| immunoglobulin | P |
| Q | Blood clotting |
Identify (i) and (ii) and select the correct option.
i. Protein portion of the enzyme is called the ____________.
ii. Non-protein constituent binding to the enzyme is called as the ____________.
The optically inactive amino acid is ____________.
The conjugate acid of \[\ce{CO^2-_3}\] is ____________.
Proteins are ______ of amino acids.
Identify the enzyme X in the following reaction.
\[\ce{H2O2(aq) ->[x] H2O(l) + \frac{1}{2} O2(g)}\]
Complete the analogy and select the correct option.
α-helix structure : Keratin :: β-pleated sheet : ____________.
Identify the enzyme that catalyses the reaction of CO2 with water in huma body.
The bacteriostatic antibiotic from the following is ______.
β-pleated sheets of polypeptide chains are present in ______.
The side chain R in cysteine is ____________.
The amino acid having −CH3 as side chain is ____________.
Which of the following is the simplest amino acid?
The basic amino acid is ____________.
The molecular weight of hemoglobin is ______ Daltons.
The most abundant cellular protein is ______.
Proteins attached with a prosthetic group are called ______ proteins.
A protein is a sequence of amino acids. The end of the polypeptide chain of -NH2 end and at -COOH end are respectively called ______.
An iron-containing red protein is ______
If side-chain group-R for amino acid is -CH2OH, identify the amino acid from following?
Identify basic amino acid from following.
Which of the following amino acids has –CH2OH group in its side chain?
Which among the following is a globular protein?
Which among the following is basic amino acid?
In a protein, various amino acids linked together by ____________.
Among the following the achiral amino acid is:
In aqueous solution of amino acids mostly exists in, ____________.
The secondary structure of a protein refers to ____________.
Write a note on denaturation of proteins.
Define enzymes.
Denaturation of proteins leads to loss of their biological activity by:
The amino acid, which is basic in nature is ______.
Which among the following enzymes hydrolysis starch?
Peptide and hydrogen bonds are present in the primary structure of the protein which is due to ______.
Write a short note on peptide bond.
Write a short note on peptide bond.
Write the Zwitter ion structure of alanine.
Define the term Protein.
Write a short note on peptide bond.
Write the Zwitter ion structure of alanine.
Write the Zwitter ion structure of alanine.
Write a short note on peptide bond.
Write a short note on peptide bond.
Short Answer Question.
Write the Zwitter ion structure of alanine.
Write the Zwitter ion structure of alanine.
Write a short note on peptide bond.
Write a short note on peptide bond.
Write the Zwitter ion structure of alanine.
Given below are two statements.
Statement I- Most of the blood proteins are acidic proteins.
Statement II - Derived proteins are not found in nature.
In the light of above statements, Select the correct option given below.
Which from following is an essential amino acid?
The number of amino groups in the amino acids present in amides is ______.
