The reason animals need a continuous supply of oxygen is to
A) make carbon dioxide.
B) dispose of carbon dioxide.
C) carry out glycolysis.
D) obtain energy from their food.
Answer: D
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Which layer(s) of the digestive tract in mammals directly contacts the lumen?
a. mucosa b. muscularis c. submucosa d. serosa e. serosa and muscularis
Most small molecules are permeable across
a. both mitochondrial membranes. b. the inner, but not the outer, mitochondrial membrane. c. the outer, but not the inner, mitochondrial membrane. d. neither mitochondrial membrane.
The nucleolus is the site of
A. protein synthesis. B. lipid synthesis. C. uncoiling and unraveling of chromosomes. D. ribosome assembly. E. chromosome replication.
Immediate hypersensitivity is ________ mediated, and delayed type hypersensitivity is ________ mediated
a. antibody / cell b. cell / antibody c. Th1 / IgE d. IgG / Th2