Identifying membrane components in fluid mosaic model

Steps:

• Recall plasma membrane structure: phospholipids form bilayer with hydrophilic heads and hydrophobic tails; proteins, glycoproteins, and glycolipids embedded.
• Examine label 1: attached carbohydrate to lipid indicates glycolipid, aiding cell recognition.
• Examine label 2: protein-lipid complex in head region suggests lipoprotein head, involved in transport.
• Match to options: C correctly pairs glycolipid for 1 and lipoprotein head for 2.

Why C is correct:

• Glycolipids (label 1) are lipids with oligosaccharides for cell signaling; lipoprotein heads (label 2) integrate proteins into lipid bilayer per Singer-Nicolson model.

Why the others are wrong:

• A: Misidentifies 1 as glycoprotein (protein-based, not lipid) and 2 as plain protein.
• B: "Lipoprote in head" is incomplete/misspelled; doesn't specify 1 as glycolipid accurately.
• D: Confuses 2 as phosphate head (phospholipid part) instead of lipoprotein.

Final answer: C