This molecule forms the main building block of chitin. For 10 points each:
[10h] Name this derivative of glucose that makes up part of the cell wall. It forms peptidoglycan with N-acetylmuramic acid.
ANSWER: N-acetylglucosamine [accept NAG or GlcNAc]
[10e] Chitin makes up the exoskeletons of the members of this incredibly abundant and diverse phylum that includes arachnids, crustaceans, and insects.
ANSWER: arthropods [or Arthropoda]
[10m] Arthropod exoskeletons often also contain this mineral. Crustaceans acquire this basic compound directly from seawater, which is inhibited by ocean acidification.
ANSWER: calcium carbonate
<Science - Biology>