Biomolecules practice · Easy

Option D (All of the above) is correct because glucose is also called dextrose, it is a monomer of starch and cellulose, and its molecular formula is $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6$.

The correct answer is D (Hormones) because hormones are chemical messengers produced by ductless glands and secreted directly into the bloodstream.

Option A is correct because carbohydrates that are sweet in taste often break down into simpler sugars upon hydrolysis.

The correct answer is D (A galactose and a glucose molecule) because lactose is a disaccharide composed of one galactose molecule and one glucose molecule linked by a beta-1,4-glycosidic bond.

Option C (Phosphoglycero mutase) is correct because phosphoglyceromutase is the enzyme that catalyzes the internal rearrangement of 3-phosphoglyceric acid to 2-phosphoglyceric acid in glycolysis.

Option A (Vitamin) is correct because calciferol is the chemical name for Vitamin D.

Option D (Cellulose) is correct because cellulose is the main structural component of plant cell walls, making it the most abundant organic compound on Earth.

Option B (Glucose and fructose) is correct because glucose and fructose form identical osazones due to their similar structures at carbons 3, 4, and 5, with the difference only at carbons 1 and 2, which are involved in osazone formation.

Option C (Penta acetate) is correct because glucose has five hydroxyl groups (-OH) that react with acetic anhydride to form five ester linkages, resulting in glucose pentaacetate.

Option D (38 mole of ATP) is correct because one mole of glucose on complete respiration typically produces 38 moles of ATP.

Option C (Vitamin ${\mathrm{B}_{12}}$) is correct because it contains a cobalt atom.

Option C (Single strand) is correct because RNA is a single-stranded molecule, unlike the double helix structure of DNA.

Option D (Biurete) is incorrect. Option C (Ninhydrin) is correct because proteins give a blue color with ninhydrin solution when heated.

Option A (2 to 10) is correct because oligosaccharides are defined as carbohydrates containing 2 to 10 monosaccharide units.

Option B (C) is correct because citrus fruits are well-known for being a rich source of Vitamin C.

Option A (Vitamin C) is correct because Ascorbic acid is also known as Vitamin C.

Option B (Monosaccharides) is correct because hexoses and pentoses are simple sugars, which are classified as monosaccharides.

Option A (Glucose) is correct because starch is a polysaccharide made up of glucose units, and hydrolysis breaks it down into its constituent glucose molecules.

The correct answer is A (A) because cod-liver oil is a well-known source of Vitamin A.

Option D ($\alpha$ -D-Glucopyranose and $\beta$ D-fructofuranose) is correct because sucrose is formed by the glycosidic linkage between $\alpha$-D-glucopyranose and $\beta$-D-fructofuranose.

Option B (Saturated fatty acids) is correct because fats, by definition, are triglycerides of saturated fatty acids, which are solid at room temperature.

The correct answer is C because sucrose is a disaccharide and a non-reducing sugar, but the glycosidic linkage is between C1 of $\alpha$-glucose and C2 of $\beta$-fructose.

Option D (All of these) is correct because dextrins are used in making adhesives, confectionery, and sizing paper.

Option A (Sucrose) is correct because sucrose does not have a free aldehyde or ketone group, making it a non-reducing sugar.

Option B (Glycerol) is correct because fats are triglycerides, which are esters formed from glycerol and fatty acids.

Option A (monosaccharide) is correct because monosaccharides are the simplest carbohydrates and cannot be further hydrolyzed.

Option B (Enzyme) is correct because enzymes are biological catalysts that speed up chemical reactions in living organisms.

Option A (Vitamin A) is correct because Vitamins A, D, E, and K are fat-soluble, while Pyridoxin (Vitamin B6), Riboflavin (Vitamin B2), and Thiamine (Vitamin B1) are water-soluble.

The correct answer is D (Polysaccharide) because glycogen is a complex carbohydrate made up of many glucose units.

Option B ($\mathrm{C}{\mathrm{u}_2}\mathrm{O}$) is correct because glucose reduces Cu²⁺ ions in Fehling's and Benedict's solutions to Cu⁺, forming cuprous oxide ($\mathrm{C}{\mathrm{u}_2}\mathrm{O}$), which is a red precipitate.