The flow of ____ and the cycling of ____ maintains nature’s organization
a. water; populations
b. atoms; energy
c. nutrients; water
d. energy; materials
e. raw materials; water
ANSWER: d
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Class II MHC proteins have grooves with
A) closed ends. B) open ends. C) both open and closed ends. D) neither open nor closed ends.
Why are epithelial membranes not very thick?
A. Epithelial tissues are required to support other cells growing on top of the tissue. B. Epithelial tissues play a critical role in transport, and must be thin to allow diffusion to occur. C. Epithelial tissues can only reach a certain thickness because their growth is constrained by microtubules inside the cell membrane. D. Thick epithelial tissues would collapse due to the drying effect of the environment. E. Epithelial tissues are programmed to stop dividing after only a few cell cycles.
Mutations in different types of aquaporin proteins lead to a variety of clinical manifestations, such as diabetes
insipidus, epileptic seizures and cataracts. What best explains the differences in the conditions caused by these mutations?
a. Different types of aquaporin proteins allow different rates of water diffusion. b. Different aquaporin proteins are localized to different membranes in the cell. c. Different types of aquaporin proteins are produced in different cell types.
a. Different types of aquaporin proteins allow different rates of water diffusion. b. Different aquaporin proteins are localized to different membranes in the cell. c. Different types of aquaporin proteins are produced in different cell types.
Helium is an inert gas that rarely reacts with other elements because it has the maximum number of valence electrons in its outer shell.
Answer the following statement true (T) or false (F)