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प्रश्न
Explain globular and fibrous proteins with example.
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उत्तर
Globular proteins:
- Molecules of globular proteins have a spherical shape. This shape results from coiling around the polypeptide chain of the protein.
- Globular proteins are usually soluble in water.
For example: Insulin, egg albumin, serum albumin, legumelin (protein in pulses)
Fibrous proteins:
- Molecules of fibrous proteins have elongated rod-like shape. This shape is the result of holding the polypeptide chains of protein parallel to each other.
- Hydrogen bonds and disulfide bonds are responsible for this shape.
- Fibrous proteins are insoluble in water.
For example: Keratin (present in hair, nail, wool), myosin (protein of muscles).
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संबंधित प्रश्न
Give scientific reasons:
α-Amino acids have high melting points compared to the corresponding amines or carboxylic acids of comparable molecular mass.
Draw a neat diagram for the following:
Zwitter ion
Draw a neat diagram for the following:
Enzyme catalysis
Complete the following reaction.
\[\ce{H2N - CH2 - COOH + H2N - CH2 - CH2 - COOH ->[-H2O] ?}\]
Define peptide bond.
Write types of proteins depending upon molecular shape.
Define α-amino acids.
From the following identify the INCORRECT match with respect to the different structures of proteins.
____________ is NOT a simple protein.
Nucleotide differs from a nucleoside as it has ______
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 |
Choose the WRONG statement from the following.
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 ____________.
Which of the following contains keratin?
Proteins are polypeptides with linear chains of i ______ linked by ii ______ bonds.
Identify the enzyme X in the following reaction.
\[\ce{H2O2(aq) ->[x] H2O(l) + \frac{1}{2} O2(g)}\]
Which among the following amino acids has lowest molar mass?
The bacteriostatic antibiotic from the following is ______.
The enzyme which converts maltose to glucose is ______.
The amino acid having −CH3 as side chain is ____________.
The basic amino acid is ____________.
The molecular weight of hemoglobin is ______ Daltons.
Proteins attached with a prosthetic group are called ______ proteins.
Identify basic amino acid from following.
Which among the following amino acids has the lowest molecular mass?
Which among the following is a globular protein?
In a protein, various amino acids linked together by ____________.
Among the following the achiral amino acid is:
The secondary structure of a protein refers to ____________.
Give the differences between the primary and secondary structure of proteins.
Write a note on denaturation of proteins.
Denaturation of proteins leads to loss of their biological activity by:
The amino acid, which is basic in nature is ______.
Tertiary structure of protein is stabilised by ______.
Write a short note on peptide bond.
Write a short note on peptide bond.
Write a short note on peptide bond.
Write a short note on peptide bond.
Write the Zwitter ion structure of alanine.
Write the Zwitter ion structure of alanine.
Short Answer Question.
Write the Zwitter ion structure of alanine.
Write the Zwitter ion structure of alanine.
Which from following amino acids contains heterocyclic ring at a side chain (R) group?
