Free Carbohydrates MCQs with Answers
115 Carbohydrates MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Carbohydrates are organic compounds classified as monosaccharides, disaccharides and polysaccharides according to their structure and hydrolysis products. The topic covers glycosidic bonds, glucose and fructose, sucrose, lactose and maltose, starch, glycogen and cellulose, along with their roles in energy storage, structural support and food tests.
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- A. Hydrolysis
- B. Condensation
- C. Oxidation
- D. Neutralisation
Explanation: A condensation reaction joins the two monosaccharides through a glycosidic linkage and releases one molecule of water.
Correct answer: Condensation- A. cellulose contains beta 1,4 linkages that human enzymes cannot hydrolyse
- B. cellulose molecules are too large to enter the gut
- C. cellulose is a protein rather than a carbohydrate
- D. starch contains no glycosidic bonds at all
Explanation: Starch is built from alpha glucose and its alpha 1,4 linkages are hydrolysed by amylase, while cellulose is built from beta glucose and…
Correct answer: cellulose contains beta 1,4 linkages that human enzymes cannot hydrolyse- A. Sucrose
- B. Starch
- C. Maltose
- D. Cellulose
Explanation: Maltose keeps a free anomeric carbon, so its open-chain form has an aldehyde group that reduces Benedict's reagent to a brick red…
Correct answer: Maltose- A. isomers
- B. polymers
- C. isotopes
- D. identical sugars
Explanation: Isomers share a molecular formula but differ in the arrangement of their atoms, and here glucose carries an aldehyde group while fructose…
Correct answer: isomers- A. contains no glycosidic bonds
- B. is soluble and diffuses freely out of the cell
- C. is built from beta glucose
- D. is far more branched, so many ends can be hydrolysed at once
Explanation: Extensive branching gives a large number of terminal glucose units, so enzymes can release glucose very rapidly when an active animal…
Correct answer: is far more branched, so many ends can be hydrolysed at once- A. Glycosidic bond
- B. Peptide bond
- C. Ester bond
- D. Phosphodiester bond
Explanation: A peptide bond (amide bond) forms between the carboxyl group of one amino acid and the amino group of another, with loss of water.
Correct answer: Peptide bond- A. β-glucose
- B. α-glucose
- C. Fructose
- D. Galactose
Explanation: Both starch and glycogen are polymers of α-glucose, linked by α-1,4 and α-1,6 glycosidic bonds.
Correct answer: α-glucose- A. Pepsin
- B. Trypsin
- C. Salivary amylase
- D. Lipase
Explanation: Salivary amylase (ptyalin) begins starch digestion in the mouth, breaking it into maltose.
Correct answer: Salivary amylase- A. Carbohydrate
- B. Protein
- C. Lipid
- D. Nucleic acid
Explanation: Lipids provide about 9 kcal/g, while carbohydrates and proteins provide about 4 kcal/g each.
Correct answer: Lipid- A. Type of sugar
- B. Presence of uracil vs thymine
- C. Being nucleic acids
- D. Single vs double stranded
Explanation: Both DNA and RNA are nucleic acids. They differ in sugar (deoxyribose vs ribose), bases (T vs U), and structure (double vs single stranded).
Correct answer: Being nucleic acids- A. two saccharide units
- B. ten saccharide units
- C. three to ten saccharide units
- D. more than ten saccharide units
Explanation: This is the option marked correct in the official UHS answer key, taking oligosaccharide in its broad sense of a few sugar units…
Correct answer: two saccharide units- A. Sucrose
- B. Pentose
- C. Lactose
- D. Glycogen
Explanation: Glycogen is a highly branched polymer of thousands of glucose units, stored in liver and muscle as the animal energy reserve.
Correct answer: Glycogen- A. Water
- B. Glucose
- C. Oxygen
- D. Sodium chloride
Explanation: Glucose is an organic carbohydrate because it contains carbon and hydrogen bonded in a carbon-based molecular structure and serves as a…
Correct answer: Glucose- A. Calcium
- B. Iron
- C. Water
- D. Carbohydrates
Explanation: Carbohydrates are broken down into glucose and other simple sugars, which cells use in cellular respiration to release energy for vital…
Correct answer: Carbohydrates- A. Protein
- B. carbohydrates
- C. Flavoprotein
- D. lipid
Explanation: Molisch's test is a general test for carbohydrates because carbohydrate dehydration products react with alpha-naphthol to produce a violet…
Correct answer: carbohydrates- A. Dextrose
- B. Sugar
- C. Glycogen
- D. Starch
Explanation: Glucose is also called dextrose, especially because naturally occurring glucose rotates plane-polarized light to the right.
Correct answer: Dextrose- A. Claude Silbert Hudson
- B. Anselme Payen
- C. Jons jacob Berzeliis
- D. Justus von Liebig
Explanation: Claude Silbert Hudson is commonly described in older textbooks as a father of carbohydrate chemistry because of his work on sugar…
Correct answer: Claude Silbert Hudson- A. Starch
- B. Glucose
- C. Fructose
- D. Cellulose
Explanation: Plants synthesize glucose during photosynthesis from carbon dioxide and water using light energy, and glucose is then used to form other…
Correct answer: Glucose- A. Aerial stem
- B. Root
- C. Scale leaves
- D. Bud
Explanation: An onion bulb is a modified underground stem whose fleshy scale leaves store carbohydrates and water.
Correct answer: Scale leaves- A. Cellulose
- B. Starch
- C. Glycogen
- D. All of these
Explanation: Green algae store photosynthetic carbohydrate mainly as starch, often in association with their chloroplasts.
Correct answer: StarchCarbohydrates MCQs: common questions
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There are 115 Carbohydrates MCQs in the Biology bank, shown 20 to a page with the correct answer and an explanation on each.
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