________ can destroy infected cells
A) Macrophages
B) Mast cells
C) B cells
D) Cytotoxic T cells
Answer: D
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All are true about a dehydration reaction EXCEPT which of the following?
A. Results in removal of a water molecule. B. Essential for the breakdown of complex molecules to simple ones. C. Essential to the formation of polymers. D. Essential for the formation of glycogen from glucose monomers. E. Essential for the formation of triglycerides (fat) from glycerol and fatty acids.
During stressful situations, epinephrine initiates all of the following actions EXCEPT
a. constriction of blood vessels to the skin. b. constriction of blood vessels to the heart. c. dilation of blood vessels to the brain. d. an increase in metabolic rate. e. an increase in blood glucose levels.
Which membrane type lines body cavities that open to the outside of the body, such as the digestive
tract? a. serous membrane b. exocrine membrane c. endocrine membrane d. basement membrane e. mucous membrane
What percent of the world's land is used for crops and livestock pastures?
A. 73% B. 13% C. 17% D. 37% E. 7%