Tag: protein and its function

Questions Related to protein and its function

Which ones are not true?
(a) Glycerol is a 3-carbon alcohol with 3-$OH$ groups as binding sites
(b) Waxes are esters of long chain alcohol and saturated fatty acids
(c) The term protein was coined by Mulder
(d) Agar is an indispensable polysaccharide being a complex polymer of glucose and sulphur containing carbohydrates

evs - i constituents of food simple test for nutrients test for nutrients protein and its function nutrients and foodstuffs

  1. a and c only

  2. d only

  3. a and d only

  4. a, b and d only

Show answer
Correct Option: B
Explanation:

a) Glycerol has chemical formula of  C$ _3$H$ _8$O$ _3$. 3 OH groups act as binding site. The carboxyl end of the fatty acid combines with the three -OH groups of the glycerol to form ester. The statement is true.

b) Wax is a long chain of esters of alcohol and saturated fatty acids. These are hydrophobic. It consists of long alkyl chains. The statement is true.
c)  The term protein was coined by Mulder in 1838. Proteins are building blocks of the body. The proteins are made up of amino acids. The amino acids are linked together by peptide bonds to form a protein. Peptide bond is formed by the linkage of the carboxyl group of one amino acids with the amino group of the amino acids. The statement is true.
d) Agar is a jelly like substance which is mainly derived from agarose present in the cell wall of the algae. The statement is false as it is not a polymer of glucose and sulphur but it is a linear polymer of galactose.
So, the correct answer is option B.

Proteins are a polymerisation product of 

evs - i constituents of food simple test for nutrients test for nutrients protein and its function nutrients and foodstuffs

  1. Monosaccharides

  2. Muramic acid

  3. Amino acids

  4. All the above.

Show answer
Correct Option: C
Explanation:

Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues. Amino acids are Linked by peptide bonds to form polypeptide chains. Proteins are linear polymers formed by linking the α-carboxyl group of one amino acid to the α-amino group of another amino acid with a peptide bond (also called an amide bond).

So, the correct answer is option C.

Select the correct option:

Acidic amino acids have two $-COOH $ groups and one $-NH _2$ group per molecule. Select the pair that consists of acidic amino acids. 

evs - i constituents of food simple test for nutrients test for nutrients protein and its function nutrients and foodstuffs

  1. Aspartic acid, glutamic acid

  2. Lysine, arginine

  3. Glycine, alanine

  4. Both (a) and (b)

Show answer
Correct Option: A
Explanation:

An amino acid is the structural and functional unit of protein and are made up of carbon, hydrogen, oxygen, nitrogen and sometimes sulphur. These are organic acids with a carboxyl group and one amino group.  Amino acid acts as a buffer. 

Based on the groups that are present on the side chain of amino acid they are divided into various categories. 
Acidic amino acids are the ones that have a carboxyl group in their side chain for example aspartic acid and glutamic acid.
Basic amino acids are the ones that have a basic group and NH2 in their side chain; for example lysine and arginine.
Simple amino acids are the ones that do not have any functional group in their side chain; for example glycine, valine and alanine.

So, the correct option is 'Aspartic acid, glutamic acid'