text: This structure can be stained with wheat germ agglutinin derivatives or with the acid-fast stain.
full_question: This structure can be stained with wheat germ agglutinin derivatives or with the acid-fast stain. This structure is targeted by lysozymes and their formation is inhibited by beta-lactams. This structure is composed of a substance that oddly contains D-amino acids. The substance that forms this structure is a polymer of NAG and NAM. The thickness of this structure determines how well it retains crystal violet, and thus determines whether an organism is Gram-positive or Gram-negative. This structure is primarily composed of peptido-glycan in bacteria. For 10 points, name this protective structure that surrounds the cell membrane of bacteria.
first_sentence: This structure can be stained with wheat germ agglutinin derivatives or with the acid-fast stain.
raw_answer: bacterial cell walls [prompt on "cell envelope"; do NOT accept cell membrane]