B1.1.7—Glycoproteins in cell-cell recognition

B1.1 becomes easy when every answer follows structure -> property -> function. Carbon skeletons and functional groups create molecular diversity. Condensation builds larger molecules and hydrolysis breaks them. Alpha-glucose stores energy as starch and glycogen; beta-glucose forms strong cellulose. Surface carbohydrates enable recognition. Lipids are hydrophobic, triglycerides store energy, phospholipids self-assemble into bilayers, and steroids cross membranes because they are mostly non-polar.

• Carbon bonding and functional groups explain molecular diversity.
• Condensation releases water; hydrolysis uses water.
• Carbohydrates can store energy, build cell walls, and mark cell surfaces.
• Lipids are hydrophobic and not true polymers.
• Triglycerides store energy; phospholipids form membranes; steroids signal across membranes.