Biology · Class 11 · Chapter 9
Biomolecules
14 lessons 97 min 2 simulations
This chapter asks what living things are made of. It shows how a tissue is taken apart into an acid-soluble pool of small molecules and an acid-insoluble fraction of large ones, and meets the small building blocks: amino acids, fatty acids and glycerol, sugars, nitrogen bases, nucleosides and nucleotides. It then builds them into the three true macromolecules, proteins, polysaccharides and nucleic acids, describes the four levels of protein structure, and ends with enzymes: how they lower activation energy, what affects their activity, how they are classified and which co-factors they need.
What the exam asks
NEET tests the numbers and names here: the molecular-weight cut-offs of the two fractions, why lipids land in the acid-insoluble fraction, water as the most abundant chemical, collagen and RuBisCO as the most abundant proteins, purines versus pyrimidines, nucleoside versus nucleotide, starch-iodine blue, the 2 alpha plus 2 beta subunits of haemoglobin, the shape of the enzyme curves for temperature, pH and substrate, malonate as a competitive inhibitor of succinic dehydrogenase, the six enzyme classes, and the three kinds of co-factor with their examples.
Lessons
14 lessons · 97 min
1How to analyse chemical compositionNCERT §9.17 min2Amino acidsNCERT §9.16 min3Lipids, nucleotides and sugarsNCERT §9.16 min4Primary and secondary metabolitesNCERT §9.25 min5BiomacromoleculesNCERT §9.36 min6ProteinsNCERT §9.45 min7PolysaccharidesNCERT §9.56 min8Nucleic acidsNCERT §9.66 min9Structure of proteinsNCERT §9.75 min10Enzymes and chemical reactionsNCERT §9.8, §9.8.16 min11How enzymes speed up reactionsNCERT §9.8.2, §9.8.310 min 1 sim12Factors affecting enzyme activityNCERT §9.8.49 min 1 sim13Classification of enzymes and co-factorsNCERT §9.8.5, §9.8.66 min14Chapter reviewMust-know facts, traps and formulas14 min