Which is not a characteristic of spirochetes?

A) Endoflagella enclosed in periplasmic space
B) Always motile
C) Helical shape
D) All are pathogenic
E) Gram-negative


D) All are pathogenic

Biology & Microbiology

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The hormone that controls the milk letdown reflex is:

A) estrogen B) luteinizing hormone C) oxytocin D) follicle-stimulating hormone

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Compare and contrast the streak-plate method of isolation with the pour-plate method of isolation

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As a by-product of photosynthesis, what percentage of the Earth's atmosphere is oxygen?

A) 31 percent B) 21 percent C) 10 percent D) 41 percent E) 50 percent

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