[Campbell Biology P.168] Based on the description in the text, what is the primary compositi... | Practice Question

Based on the description in the text, what is the primary composition of a proteoglycan molecule?

  • A: Mostly protein
  • B: Mostly carbohydrate
  • C: Equal parts protein and lipid
  • D: Mostly nucleic acid

Explanation

The text states: 'A proteoglycan molecule consists of a small core protein with many carbohydrate chains covalently attached, so that it may be up to 95% carbohydrate.' This clearly indicates that proteoglycans are primarily composed of carbohydrates.