The force that holds nucleons together in the nucleus is: MCQ with Answer and Explanation

Explanation:
Ionic (electrovalent) bond is formed by complete transfer of one or more valence electrons from a metal (low ionization energy) to a non-metal (high electron affinity), resulting in oppositely charged ions held by electrostatic forces. Example: Na → Na⁺ + e⁻; Cl + e⁻ → Cl⁻; Na⁺Cl⁻. Covalent bond involves sharing. Coordinate bond involves donation.

Explanation:
Enzymes are proteins that act as catalysts, exhibiting high specificity for substrates (lock-and-key model). They are not consumed, denature at high temperatures, and are organic. Examples: amylase for starch, pepsin for proteins.

Explanation:
Enzymes are proteins with complex three-dimensional structures maintained by hydrogen bonds, ionic bonds, and hydrophobic interactions. Extremes of pH or high temperature disrupt these bonds, causing denaturation (loss of structure and function). Each enzyme has an optimum pH and temperature. For example, pepsin works in acidic stomach, trypsin in alkaline intestine.