The macromolecule containing alternating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) chains cross-linked by short peptide fragments is ________.
A. teichoic acid
B. mycolic acid
C. lysozyme
D. lipopolysaccharide
E. peptidoglycan
Answer: E
You might also like to view...
Which of the following is true of species diversity over time?
1.The distribution pattern of protozoans most closely matches that of insects.
2.Angiosperm diversity in the Paleozoic most closely matches that of insects.
3.Trilobites expanded in the Mesozoic before going extinct.
4.Insects have had the greatest species expansion during the Cenozoic.
Which one of the following is the earliest event in the process of fertilization?
A) Sperm contact the jelly coat around the egg. B) The sperm head plasma membrane fuses with the egg plasma membrane. C) Enzymes from the acrosome are released. D) The sperm nucleus enters the cytoplasm of the egg.
What is the most likely reason that cellular respiration would shift from an aerobic state into an anaerobic state?
A) The individual was exercising at a level beyond their capability and entered into oxygen debt. B) A smoker has developed emphysema and has decreased lung capacity. C) The individual has had a stroke in the left hemisphere of their brain. D) None of these E) All of the choices are reasons that an individual could shift into an anaerobic state
By which of the following mechanisms can a cell transport a substance from a lower to a higher concentration?
A) simple diffusion B) facilitated diffusion C) active transport D) extracellular enzymes E) aquaporins