In an inflammatory response, the direct effect of histamine is to _______________
A. dilate blood vessels causing increased blood flow to the area of infection
B. decrease heat accumulation in the area of infection
C. directly kill bacteria
D. attack cytotoxic T cells
E. cause B cells to release antibodies
A
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Which one of the following is NOT one of the general classes of macromolecules that are necessary for cellular function?
A. Nucleic acids B. Proteins C. Ions D. Carbohydrates E. Lipids
Spirilli are Gram-negative bacteria that possess internal flagella, which cause the entire cell to twist in a corkscrew
pattern.
Indicate whether the statement is true or false.When tropical forests are cut for agriculture, they often do not produce highly productive crop growth
What is probably limiting the growth of a crop in the tropical forest?
a. Sunlight. b. Rainfall. c. Carbon dioxide d. Soil nutrients. e. Bacteria.
Colon polyps____
a. are mostly benign but some may become cancerous b. are difficult to cure c. are small growths that project from the wall of the small intestine d. are responsible for 500,000 deaths in the U.S. every year e. are usually benign but may become cancerous and are responsible for 500,000 deaths in the U.S. every year