Biomolecules practice · Mixed difficulty

Option D (Glucose) is correct because glycogen, a polysaccharide, is composed of glucose monomers and yields glucose upon hydrolysis.

Option C (hydrogen bonds) is correct because the alpha-helix structure of proteins is stabilized by hydrogen bonds between the NH group of one amino acid and the CO group of another.

Option B (Ribose sugar and uracil) is correct because RNA contains ribose sugar as its pentose sugar and uracil as one of its nitrogenous bases.

Option B is correct because carbohydrates are defined as polyhydroxy aldehydes or ketones, or substances that produce them upon hydrolysis.

Option A ($\alpha$-tocopherol) is correct because it is known as Vitamin E, which acts as an antisterility factor.

Option A (Groundnut) is correct because groundnuts contain the highest percentage of protein compared to the other options.

Option A is correct. The fact that pentaacetate of glucose does not react with NH2OH indicates the absence of a free -CHO group, which contradicts the open-chain structure of glucose.

Option A (Cellulose) is correct because cellophane is a thin, transparent sheet made from regenerated cellulose.

Option A (It is straight chain polymer similar to amylose) is correct because glycogen is a branched polymer similar to amylopectin, not a straight chain polymer like amylose.

Option B (Sucrose) is correct because sucrose is a non-reducing sugar, meaning it cannot reduce other substances.

Option D is correct because both the assertion and the reason are false. Sucrose and saccharin do not have nearly the same sweetness index, and saccharin is not a carbohydrate.

Option A is correct because both the assertion and the reason are correct, and the reason correctly explains why the term \"vitamine\" was changed to \"vitamin.\"

Option B (If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion) is correct because sucrose is a disaccharide and it undergoes mutarotation after hydrolysis into glucose and fructose, but being a disaccharide is not the direct cause of mutarotation.

Option C (Oxidoreductase) is correct because oxidoreductases are enzymes that catalyze oxidation-reduction reactions, involving the transfer of electrons between substrates.

Option C is correct because β-D-(+)-Glucose has 5 chiral carbons, and β-D-(-)-Fructose has 4 chiral carbons, resulting in a difference of 1.

Option D (All of the above) is correct because glucose is used in the manufacture of vitamin C, as a preservative, and in the manufacture of alcohol.

Option B ($\alpha \mathrm{ - }$ D – galactose and $\beta \mathrm{ - }$ D – glucose) is correct because lactose is a disaccharide that hydrolyzes into these two monosaccharides.

The correct answer is C (Vitamin C) because ascorbic acid is the chemical name for Vitamin C, an essential nutrient for humans.

Option D (Are highly unsaturated and so undergo atmospheric oxidation to yield resinous residue and becomes hard solid) is correct because drying oils contain unsaturated fatty acids that polymerize upon exposure to air, forming a solid film.

Option C (Keratin $\& myosin are fibrous proteins and soluble in water) is correct because keratin and myosin are fibrous proteins and are *insoluble* in water, not soluble.$

Option C (Mother’s milk) is correct because mother's milk contains antibodies (especially IgA) that provide passive immunity to newborns.

Option C (Thymine and Cytosine) is correct because thymine and cytosine are both pyrimidine bases found in nucleic acids.

Option A (8000) is correct because with 20 amino acids, the number of tripeptides is 20*20*20 = 8000.

Option B (3-H bonds) is correct because Guanine and Cytosine are bonded by three hydrogen bonds in DNA structure.

Option D (All of these) is correct because both glucose and fructose are reducing sugars and will react with Fehling's, Tollen's, and Benedict's solutions.

Option B (A hormone) is correct because insulin is a protein hormone secreted by the pancreas that regulates blood sugar levels.

Option C (Both (a) and (b)) is correct because drying oils contain a large amount of both Linoleic and Linolenic acid.

The correct answer is B (Reduction) because Dalda (vegetable ghee) is prepared by the hydrogenation (reduction) of oils.

Option A (Presence of phosphate units) is correct because nucleotides contain phosphate groups, while nucleosides do not.

Option B (Soap and glycerol) is correct because the reaction of fat with NaOH results in saponification, producing soap and glycerol.