The brush border lining of the small intestine is derived from ____

a. rugae
b. villi
c. microvilli
d. autonomic nerves
e. circular smooth muscle


ANSWER: c

Biology & Microbiology

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Which of the following are consequences of anaerobic respiration?  (Check all that apply.)

A. Some bacteria may cause denitrification. B. Some bacteria are able to perform nitrogen fixation. C. Bacteria are able to reduce the levels of  NO3 ¯ in sewage plant effluents. D. Some bacteria are able to readily survive in both well-oxygenated as well as anoxic environments.

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This lymph organ is responsible for producing red and white blood cells and platelets. 

A. thymus B. red bone marrow C. spleen D. lymph nodes

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Botulism is caused by a proteinaceous exotoxin; therefore it can easily be prevented by

a. Boiling food prior to consumption. b. Administering antibiotics to patients. c. Not eating canned food. d. Preventing fecal contamination of food. e. Filtering food.

Biology & Microbiology

A certain bacterium infects a plant's upper leaves. A few days later, bacteria of the same species attempt to infect the same plant's roots but are unsuccessful. What process is responsible for the plant's ability to prevent this infection?

A) antivirulence response B) pathogenesis resistance C) systemic acquired resistance D) sequential immunity

Biology & Microbiology