All Free Biology MCQs with Answers

• A. 2
• B. 4
• C. 10
• D. 18

Explanation: 4 percent is correct option according to books4% is a reasonable and commonly accepted value that accounts for the total carbohydrate…

• A. Glycogen
• B. Collagen
• C. Starch
• D. Cellulose

Explanation: The correct answer is Option B: Collagen. Collagen is a protein, not a carbohydrate, and is essential for the structure and strength of…

• A. polysaccharides
• B. disaccharides
• C. monosaccharides
• D. oligosaccharides

Explanation: Disaccharides are carbohydrates composed of two sugar units joined by a glycosidic bond.

• A. Plants
• B. Animals
• C. Cyanobacteria
• D. Both B and C

Explanation: Glycogen is a complex carbohydrate that serves as a storage form of glucose in animals.

• A. Cellulose
• B. Glycogen
• C. Starch
• D. Lactose

Explanation: Lactose is a disaccharide, not a polysaccharide. It consists of glucose and galactose and is commonly found in milk and dairy products.

• A. ATP
• B. Calories
• C. ADP
• D. Carbohydrates

Explanation: Amount of energy in food is measured in calories.

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

Explanation: Glucose is the correct answer because it is a monosaccharide, meaning it is a single sugar unit and not a polysaccharide.

• A. Monosaccharide
• B. Disaccharide
• C. Polysaccharide
• D. All of the above

Explanation: Sucrose is classified as a disaccharide because it is composed of two monosaccharide units: glucose and fructose.

• A. 2 to 8 units
• B. 2 to 9 units
• C. 2 to 10 units
• D. 2 to 11 units

Explanation: Oligosaccharides are carbohydrates composed of 2 to 10 monosaccharide units.

• A. Tollen's reagent test
• B. Fehling's solution test
• C. Benedict solution test
• D. All of the above

Explanation: The correct answer is Option D: All of the above. Tollen's reagent test, Fehling's solution test, and Benedict solution test are all used…

• A. Lipoprotein
• B. Polysaccharides
• C. Glycoprotein
• D. Phospholipids

Explanation: Chitin is a modified polysaccharide that contains nitrogen. It is a structural carbohydrate found in the exoskeleton of arthropods and the…

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

Explanation: Animal cells store food in the form of glycogen. The excess of glucose in the blood is converted to glycogen in the muscle cells.

• A. lonic bond
• B. Hydrogen bond
• C. Peptide bond
• D. Glycosidic bond

Explanation: A glycosidic bond is a type of covalent bond which is formed between two units of monosaccharides

• A. Lactose
• B. Maltose
• C. Sucrose
• D. All of the above

Explanation: Maltose is composed of two glucose molecules bonded together. In contrast, lactose consists of one glucose molecule and one galactose…

• A. 1
• B. 2
• C. 5
• D. 6

Explanation: The ketone functional group in fructose is located on carbon number 2.In fructose, a monosaccharide, the functional group ketone…

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

Explanation: Glucose is a simple sugar, also known as a monosaccharide, which means it cannot be broken down into simpler sugars.

• A. 1 second
• B. 0.1 second
• C. 2 seconds
• D. 0.2 second

Explanation: The sinoatrial node (SAN) initiates the heartbeat and sends signals to the atrioventricular node (AVN) with a delay of about 0.1 second.

• A. Atrial systole
• B. Atrial diastole
• C. Ventricle systole
• D. Ventricle diastole

Explanation: The second part of ECG is the QRS complex which features a small drop in voltage (Q) a large voltage peak ( R ) and another small drop in…

• A. Human heart
• B. Human lungs
• C. Human stomach
• D. Human brain

Explanation: Option A is correct.The Purkinje fibers are the specialized fibers found in the human heart.

• A. It is released asgas
• B. lt forms CO2
• C. It is reduced to water
• D. It is used as an electron carier

Explanation: In the electron transport chain (ETC) of cellular respiration, oxygen (O_2) serves as the final electron acceptor.