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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
Write the structure of Zwitterion of alanine.
Draw the structure of Haworth formula of sucrose.
From the following identify the INCORRECT match with respect to the different structures of proteins.
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 |
Proteins are ______ of amino acids.
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.
For the conversion of oxygen to ozone in the atmosphere, nitric oxide in gaseous phase acts as ______.
Which of the following amino acids has \[\ce{Me - S - CH2 - CH2 -}\] group in the side chain?
Which of the following is not a broad spectrum antibiotics?
The amino acid having −CH3 as side chain is ____________.
The basic amino acid is ____________.
The number of proteins in an average human cell is over ______.
The most abundant cellular protein is ______.
Proteins attached with a prosthetic group are called ______ proteins.
Which among the following is a globular protein?
The central dogma of molecular genetics states that the genetic information flows from:
In a protein, various amino acids linked together by ____________.
Write a note on denaturation of proteins.
Write the structure of all possible dipeptides which can be obtained from glycine and alanine.
Amino acids in a protein molecule, are linked by a peptide bond. Which of the following correctly shows the reaction of forming peptide bonds?
Tertiary structure of protein is stabilised by ______.
Write a short note on peptide bond.
Write the Zwitter ion structure of alanine.
Write a short note on peptide bond.
