Biomolecules Test - 7

Biuret solution is used to identify the presence of protein. Biuret reagent is a blue solution that, when it reacts with protein, will change color to pink-purple.

The correct answer is option D
αhelix is one of the most common ways in which a polypeptide chain forms all possible hydrogen bonds (intermolecular and intramolecular hydrogen bond) by twisting into a right-handed screw(helix) with the N −H group of each amino acid residue hydrogen bonded to C=O of an adjacent turn of the helix.
 

The correct answer is A
Haemoglobin is a Quaternary protein because it has 4 polypeptide structures - 2alpha and 2 beta.

Glycine is the simplest amino acid and is the only amino acid that is not optically active (it has no stereoisomers).

The correct answer is Option C
Fat soluble vitamin - A, D, E, K
Water soluble vitamin - Vitamin B complex and C
So, vitamin B is water soluble.
Vitamins which can dissolve in water are called water-soluble vitamins. Water-soluble vitamins include vitamin-C and vitamin-B because they remove the toxins from our body through urine. Therefore, they are not stored in our body and should be taken on a daily basis through the food we eat.

Nonessential amino acids can be synthesized in the body, whereas essential amino acids must be obtained in the diet. Cells in the body can provide the carbon skeleton of the nonessential amino acids.

The correct answer is Option C
Pepsin hydrolyses proteins to amino acid(polypeptide chains) and initiates protein digestion in the digestion process in humans.

The correct answer is option A
 
Higher temperatures  speed up the effect of enzyme activity, while lower temperatures decrease the rate of an enzyme reaction. if the temperature is too high, an enzyme will denature, which causes the shape of the enzyme to change. If the enzyme 's shape changes, it cannot bind to the substrate.

Small polymers of amino acids (fewer than 50) are called oligopeptides, while larger ones (more than 50) are referred to as polypeptides. Hence, a protein molecule is a polypeptide chain composed of many amino acid residues, with each residue joined to the next by a peptide bond.