Biomolecules practice · Easy

Option D (Maltose) is correct because Molisch's test is positive for all carbohydrates, Benedict's test is positive for reducing sugars (like maltose), and Seliwanoff's test is positive for ketoses (like fructose).

The correct answer is A (Iron) because hemoglobin, the red coloring matter of blood, contains iron in a porphyrin ring system, which is crucial for oxygen transport.

Option D (Glycerides of unsaturated fatty acids) is correct because vegetable oils are esters of glycerol with unsaturated fatty acids.

Option A (The catalytic action of an enzyme is not specific) is correct because enzymes are highly specific catalysts, meaning they act on specific substrates.

Option A (Xerophythol) is correct because Xerophythol is another name for Vitamin A.

Option D (Sucrose) is correct because it lacks a free aldehyde or ketone group due to the glycosidic linkage involving both anomeric carbons.

Option D (Sucrose) is correct because sucrose is a non-reducing sugar due to the glycosidic linkage involving both anomeric carbons, preventing it from reducing Tollens' reagent.

The correct answer is D ($\alpha$ -D-Glucopyranose and $\beta$ D-fructofuranose) because sucrose is formed from $\alpha$-D-glucopyranose and $\beta$-D-fructofuranose linked by a glycosidic bond between C1 of glucose and C2 of fructose.

The correct answer is D (Cellulose) because cellulose is the most abundant organic compound in the world, forming the structural component of plant cell walls.

Option B (Antibiotics) is correct because antibiotics are a class of drugs used to treat bacterial infections, and are not a classification of proteins themselves. Enzymes, antigens, and hormones can all be proteins.

Option A (Sucrose) is correct because it lacks a free aldehyde or ketone group due to the glycosidic linkage involving both anomeric carbons.

Option C (Vitamin C) is correct because a deficiency in Vitamin C causes scurvy.

Option D (Long chain alcohols and long chain acids) is correct because waxes are esters formed from the reaction of long-chain fatty acids and long-chain alcohols.

Option C (Ninhydrin) is correct because proteins react with ninhydrin to give a blue-purple color.

The correct answer is B (Maltose) because lactose and maltose are both disaccharides with the same molecular formula ${C_{12}}{H_{22}}{O_{11}}$.

Option B ($C{H_2}OH-CHOH\mathrm{ }-CHO$) is correct because it represents glyceraldehyde, the simplest aldose (monosaccharide) with three carbon atoms.

Option D (Gene) is correct because a gene is a segment of DNA that contains the instructions for synthesizing a protein.

The correct answer is B ($\beta$ -glucose) because cellulose is a linear polymer made up of $\beta$-D-glucose units linked by $\beta(1 \rightarrow 4)$ glycosidic bonds.

The correct answer is C (Esters) because fats and oils are triglycerides, which are esters formed from glycerol and fatty acids.

Option D (76) is correct because the complete oxidation of one mole of glucose yields approximately 38 ATP molecules, so two moles would yield 76 ATP molecules.

Option C (It can catalyse any chemical reaction) is correct because enzymes are specific to certain reactions and do not catalyze all chemical reactions.

Option D (Emulsification) is correct because emulsification increases the surface area of fats, making them more accessible to digestive enzymes.

Option C (Assertion is true, but Reason is false) is correct because sucrose is a non-reducing disaccharide, but the glycosidic linkage is between C1 of α-glucose and C2 of β-fructose.

Option B (Cellulose) is the correct answer because it is a polysaccharide, while the others are enzymes.

Option C (Vitamin B) is correct because Vitamin B complex contains nitrogen in its structure.

Option A (Nucleoside + phosphoester bond = nucleotide) is correct because a nucleotide is formed when a nucleoside is linked to a phosphate group via a phosphoester bond.

Option A (${\mathrm{C}_n}{\mathrm{H}_{2n}}{\mathrm{O}_2}$) is correct because the general formula for a saturated fatty acid is $C_nH_{2n}O_2$, where 'n' represents the number of carbon atoms.

Option A (Three) is correct because a codon consists of three nucleotides in mRNA that code for a specific amino acid.

Option B (Glucose and fructose) is correct because glucose and fructose form identical osazones due to the reaction occurring at the first two carbon atoms, which are the same for both after the reaction.

Option B (Ascorbic acid) is correct because ascorbic acid is the chemical name for Vitamin C.