Practice Questions

Horseradish peroxidase is a complex conjugated enzyme; it contains an iron-bearing heme group and carries structural carbohydrate chains.

Lipoteichoic acids span the thick peptidoglycan layer and use their lipid tails to anchor the wall assembly into the cytoplasmic membrane.

Non-polar triacylglycerols and cholesterol esters aggregate in water; lipoproteins shield them to allow smooth transport through the blood.

Enveloped viruses use host-derived lipids embedded with viral glycoproteins to form a shield that facilitates membrane fusion.

Chaperones like calnexin bind to glycoproteins carrying a single terminal glucose, ensuring the protein folds properly before moving on.

Proteins are denser than lipids (1.3 g/mL vs. 0.9 g/mL). Particles containing more protein and less lipid exhibit a higher overall density.

Sulfated and carboxylated sugars carry negative charges, creating electrostatic fields that draw in water molecules to form a resilient gel.

Phytochrome is a chromoprotein with a light-sensitive bilin prosthetic group that acts as a molecular switch for plant photomorphogenesis.

Collagen is a structural glycoprotein; its triple-helix structure contains short carbohydrate chains attached to hydroxylysine residues.

ABCA1 is required to load cholesterol onto ApoA-I to form HDL; its absence causes HDL deficiency and lipid buildup in tissues.