Recent studies have shown that some Clostridia species have peptidoglycan between an inner and outer membrane, and were therefore properly reclassed as Gram-negative because of their unrelatedness.
Answer the following statement true (T) or false (F)
False
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Which of the following statements about the evolution of animal cell adhesion molecules is true?
A. Animal cell adhesion molecules evolved from protein families that originally performed other functions. B. The genes for integrins are found in all opisthokonts including animals, plants, and fungi. C. The genes for cadherins are only found in animals. D. The genes for integrins are found only in multicellular organisms. E. All of these statements about the evolution of animal cell adhesion molecules are true.
Chordates are associated with which anatomical structure?
a. central ring canal b. metanephridia c. visceral mass d. dorsal hollow nerve cord
How does the concentration inside of a cell compare to an isotonic solution outside of the cell?
a. The concentration is less than that of the outside solution. b. The concentration is equal to that of the outside solution. c. The concentration is much greater than that of the outside solution. d. The concentration is slightly greater than that of the outside solution.
Which of the following is mismatched?
A) hydatid disease — humans are the definitive host B) Taenia infestation — humans are the definitive host C) trichinellosis — humans eat larva of parasite D) pinworm infestation — humans ingest parasite's eggs E) hookworm infestation — parasite bores through skin