Peptidoglycan is cross-linked between what constituents in gram-negative bacteria?
a. N-acetylglucosamine residues
b. N-acetylmuramic acid residues
c. phosphate groups
d. DAP and D-alanine amino acids
Answer: D
Biology & Microbiology
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Fill in the blank with the appropriate word.
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Which lineage includes members called lancelets?
a. Cephalochordata b. Placodermi c. Myxinoidea d. Urochordata
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The fermentation pathway serves to recycle NADH back into NAD+.
a. true b. false
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Which structure prevents blood flowing back into the atria during ventricular contractions?
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