Which of the following statements about the ECM is most CORRECT?
A. It is composed of living cells.
B. Its components are produced by specialized cells and transported throughout the body and deposited around the cell.
C. It is a source of protein for cells.
D. It protects cells from infectious agents.
E. Its components are produced and secreted by the cell.
E. Its components are produced and secreted by the cell.
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Purple sulfur bacteria and filamentous sulfur-oxidizers both
A. accumulate sulfur as intracellular granules. B. fix nitrogen. C. produce oxygen from carbon dioxide. D. use gliding motility.
We now know that chloroplasts are derived from which group of free-living organisms?
a. mitochondria b. algae c. cyanobacteria d. archaea
The chytrids in these micrographs are Batrachochytrium dendrobatidis. What reproductive form do chytrids use that distinguishes them from other fungi?
a. ascospores
b. zygospores
c. zoospores
d. basidiospores
Which of the following statements regarding Clostridium difficile infection is incorrect?
A. It is the major cause of diarrhea in hospitals. B. It is a colitis that is a superinfection. C. It is associated with disruption of normal biota due to broad-spectrum antimicrobials. D. It is due to ingestion of contaminated, improperly stored, cooked meats and gravies.