Practice Questions

HDL participates in reverse cholesterol transport, clearing excess lipids from blood vessels and carrying them back to the hepatic tissue.

Proteoglycans are mostly carbohydrate by weight (80%–95%), containing long unbranched GAG chains, unlike standard glycoproteins.

Mannose-6-phosphate serves as a specific molecular sorting signal that targets newly synthesized hydrolytic enzymes to the lysosomes.

Human ABO blood group determinants are defined by the structural variations of carbohydrate chains on surface glycolipids and glycoproteins.

The glycocalyx acts as a cellular fingerprint; individual combinations of sugar chains allow immune cells to distinguish self from non-self.

Hydroxyl groups on sugar residues form hydrogen bonds with surrounding water molecules, rendering the region highly hydrophilic.

Lipopolysaccharides (LPS) contain a lipid A anchor component covalently bound to a core oligosaccharide and an O-antigen chain.

Mucus contains mucins, which are heavily glycosylated glycoproteins that trap pathogens and protect delicate mucosal surfaces.

Ribosomes are functional structural complexes consisting of ribosomal RNA (rRNA) and specific ribosomal proteins working together.

Hemoglobin is a metalloprotein containing an iron-porphyrin ring system called a heme group as its functional prosthetic group.