All Free Biology MCQs with Answers

• A. Addition
• B. Condensation
• C. Substitution
• D. Pyrolysis

Explanation: Polymerization of ethene involves the addition of many ethene molecules to form a long-chain hydrocarbon called polyethylene. During the polymerization process, the carbon-carbon double bond in ethene is broken, and the carbons in the double bond form single bonds with other ethene molecules. As a result, the polymer chain grows longer and longer with each addition, ultimately forming a long-chain polymer. This reaction is called an addition polymerization reaction because the monomers add together to form the polymer.Condensation reactions, on the other hand, typically involve the elimination of a small molecule, such as water or alcohol, as the monomers react to form a polymer. Substitution and pyrolysis reactions are different types of reactions that do not apply to the polymerization of ethene to form polyethylene.

• A. Amide group
• B. Amino group
• C. Protein linkage
• D. Peptide linkage

Explanation: -NH-CO- is a peptide linkage bond, done when 2 amino acids are joined together.

• A. Option A`
• B. Option B
• C. Option C
• D. Option D

Explanation: The amino acids having amino and carboxyl group attached to the same carbon, i.e., alpha-carbon atom is called alpha-amino acids.

• A. Lysine
• B. Proline
• C. Valine
• D. Alanine

Explanation: Lysine has an amino in it's R-group chain i.e.NH2.

• A. ―NH3+ and COO-
• B. ―NH3 and COO-
• C. ―NH3+ and COOH
• D. ―NH3 and COOH

Explanation: Intermediate value means under neutral conditions. So in that circumstance amino acids produce NH3+ and COO- zwitter ions.

• A. Biopolymer
• B. Lipids
• C. Condensation polymer
• D. Addition polymer

Explanation: PolyESTERS (polymers of esters) are mostly made by condensation polymerisation reactions, making them condensation polymers.

• A. Toys
• B. Gramophone recorders
• C. Compact discs
• D. Emulsion paints

Explanation: PVA is used in sizing agents that give greater strength to textile yarns and make paper more resistant to oils and greases. It is also employed as a component of adhesives and emulsifiers, as a water-soluble protective film, and as a starting material for the preparation of other resins.

• A. Condensation polymer
• B. Addition polymer
• C. Biopolymer
• D. Thermosetting polymer

Explanation: Polyvinyl chloride is an example of an addition polymer. It is formed by the addition polymerization of vinyl chloride monomers. In this process, the monomers simply add together without the elimination of any small moleucles.

• A. Hair
• B. Nail
• C. Tendons
• D. Arteries

Explanation: Collagen is most abundantly found in tendons. Tendons are fibrous connective tissues that connects muscles to bones, providing strength and facilitating movement. Collagen fibers in tendons provide structural support and contribute to their tensile strength.

• A. Stomach
• B. Mouth
• C. Liver and Muscles
• D. Small intestine

Explanation: Animals store glucose in the form of glycogen. Glycogen is a polysaccharide stored mainly in the liver and skeletal muscles. The liver plays a crucial role in regulating blood glucose levels. It stores glycogen and releases glucose into the bloodstream as needed. Muscles store glycogen to serve as an energy source during physical activity.