All Free Biology MCQs with Answers

• A. 3
• B. 5
• C. 6
• D. 2

Explanation: Ribofuranose is a type of sugar molecule that contains a furan ring structure.

• A. Protein
• B. Lipid
• C. Carbohydrate
• D. None of these

Explanation: The most common fuel of energy for cells is carbohydrate. Carbohydrates are broken down into glucose, which is then used to produce ATP…

• A. Maltose
• B. Sucrose
• C. Cellobiose
• D. Lactose

Explanation: Out of all the options only sucrose is non reducing as it does not have a free aldehyde or ketone group.

• A. glucose, galactose
• B. glucose, fructose
• C. two amino acids must form a peptide bond
• D. nitrogenous base with sugar molecule

Explanation: Lactose forms when two other sugars, glucose and galactose, join together.

• A. pentose sugars
• B. oligo sugars
• C. triose sugars
• D. manose sugars

Explanation: Glyceraldehyde (glyceral) is a triose monosaccharide with chemical formula C3H6O3. It is the simplest of all common aldoses.

• A. Brain
• B. Heart
• C. Blood
• D. Tissues

Explanation: Glycogen is a homopolysaccharide composed of a-glucose. It is a storage carbohydrate for animals.

• A. Phospholipid
• B. Polysacchrides
• C. Carbohydrates
• D. Both Options B and C are correct

Explanation: Option A : Human accumulated glycogen is not an example of phospholipids.

• A. 2
• B. 5
• C. 10
• D. All of these

Explanation: 'Oligosaccharides' are carbohydrates that contain carbon atoms ranging from 'two to ten' monosaccharides and hence, upon hydrolysis can…

• A. Silk
• B. Wool
• C. Cotton
• D. Paper

Explanation: Cotton is the purest form of cellulose. ''Silk, wool and paper all have other substances.''

• A. Lipid
• B. Carbohydrate
• C. Protein
• D. All of these

Explanation: Carbohydrates are made of hydrocarbons; hence, on hydrolysis, they may yield polyhydroxy aldehyde or ketone subunits.

• A. Monosaccharides
• B. Disaccharides
• C. Oligosaccharides
• D. Polysaccharides

Explanation: Monosaccharides form rings consisting of five or six carbon atoms (hence they are pyranoses).

• A. Amylase
• B. Sucrose
• C. Starch
• D. Lactose

Explanation: The carbohydrate that is polymerized through alpha 1,4 glycosidic linkages is starch.

• A. Glucose
• B. Starch
• C. Sucrose
• D. Glycogen

Explanation: Glycogen is a polysaccharide that serves as a form of stored energy in animals and fungi. Glucose is the primary source of energy.

• A. Triose
• B. Diose
• C. Monose
• D. None of these

Explanation: Option A is correct as monosaccharides are the simplest forms of carbohydrates.

• A. Liver
• B. Muscles
• C. kidneys
• D. Both a and b

Explanation: Glycogen is stored both in liver and muscles. Muscles because it requires active supply of energy and liver because blood from digestive…

• A. Fats
• B. Glycogen
• C. Amino acids
• D. DNA

Explanation: Glycogen is the stored form of glucose in animals. Glyocgen can be hydrolysed to produce glucose to get energy.

• A. Monosaccharides
• B. Oligosaccharides
• C. Polysaccharides
• D. Carbohydrates

Explanation: Polysaccharides are major classes of biomolecules. They are long chains of carbohydrate molecules, composed of several smaller…

• A. Maltose
• B. Sucrose
• C. Glucose
• D. Galactose

Explanation: Option C is correct since the three most abundant polysaccharides, starch, glycogen, and cellulose ( referred to as homopolymers) yield…

• A. 1000
• B. 2000
• C. 3 to 7000
• D. 3000 and more

Explanation: Option C is correct since the general formula of carbohydrates is Cx(h20)y where x is a whole number from 3 to many thousand whereas y may…

• A. Maltose
• B. Sucrose
• C. Lactose
• D. All of these

Explanation: Maltose is the immediate product of digestion of starch. Sucrose is the tranport sugar in plants. Lactose is the sugar present in milk.