- IB DP Biology 2025 SL- IB Style Practice Questions with Answer-Topic Wise-Paper 1
- IB DP Biology 2025 HL- IB Style Practice Questions with Answer-Topic Wise-Paper 1
- IB DP Biology 2025 SL- IB Style Practice Questions with Answer-Topic Wise-Paper 2
- IB DP Biology 2025 HL- IB Style Practice Questions with Answer-Topic Wise-Paper 2
B1.1.1—Chemical properties of a carbon atom allowing for the formation of diverse compounds upon which life is based
Carbon atoms can form 4 covalent bonds
Covalent bond: a very stable chemical bond in which electrons are shared between two neighbouring atoms.
Covalent bonds can be single, double or triple
Carbon can form up to 4 covalent bonds with other carbon atoms or other non-metallic elements
Covalent bonds can be single, double or triple
Fatty acid: a linear molecule
Glucose: a ringed molecule
Glycogen: a branched molecule with multiple rings
B1.1.2—Production of macromolecules by condensation reactions that link monomers to form a polymer
Macromolecules or polymers are large molecules that are made up of smaller building blocks called monomers.
Monomers are individual subunits that can be linked together to form longer chains or polymers.
- Formation of polymers by condensation reactions
Condensation: polymerisation reaction in which two molecules join together. One molecule loses a hydroxyl group (−OH) and the other loses a hydrogen atom (−H), forming a water molecule and resulting in formation of a new covalent bond.
