Tag: denaturation of protein

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Multiple choice bio-chemistry proteins denaturation of protein proteins and amino acids proteins and enzymes

Which of the following statements are true about (X) and (Y)?
X)  Globular Protein               Y)  Fibrous Protein
a.These are linear condensation polymers.
b. Insoluble in water.
c. These proteins have three dimensional folded structure.
d. These are cross linked protein.
e. Soluble in water
f. These are held together by intermolecular hydrogen bond.

  1. X = a, b, c; Y = d, e, f

  2. X = c, d, e; Y = a, b, f

  3. X = b, c, a; Y = c, b, f

  4. X = a, e, f; Y = b, c, f
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Globular Proteins have three dimensional folded structure.
These are cross linked protein.
They are Soluble in water.
Fibrous Proteins are linear condensation polymers.
They are Insoluble in water.
These are held together by intermolecular hydrogen bond.

Multiple choice bio-chemistry proteins denaturation of protein proteins and amino acids proteins and enzymes

Which structural feature distinguishes proline from other natural $\alpha$-amino acids :

  1. It is optically inactive

  2. It contains aromatic group

  3. It is dicarboxylic acid

  4. It has a secondary amine

  5. It contains two amino groups
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Proline is the only proteinogenic amino acid whose side-group links to the -amino group and, thus, is also the only proteinogenic amino acid containing a secondary amine at this position.

Multiple choice bio-chemistry proteins denaturation of protein proteins and amino acids proteins and enzymes

The sequence in which amino acids are linked to one another in a protein molecule is called its:

  1. Primary structure

  2. Secondary structure

  3. Tertiary structure

  4. Quanternary structure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Proteins may have one or more polypeptide chains. Each polypeptide in a protein has amino acids linked with each other in a specific sequence and it is this sequence of amino acids that is said to be the primary structure of that protein.