What phagocyte initiates inflammation?
A) natural killer cells
B) cytotoxic T cells
C) macrophages
D) mast cells
E) helper T cells
Ans: C) macrophages
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Because archaeons lack peptidoglycan in their cell walls
A. some have an outer layer of complex polysaccharide. B. they must always be grown in isotonic medium. C. some have an outer layer of protein. D. some have an outer layer of complex polysaccharide and some have an outer layer of protein.
True or false: Competition can only occur between members of the same species
A. true B. false
The appearance of _____ on Earth due to the action of photosynthetic bacteria occurred about 2.7 billion years ago
a. water b. carbon dioxide c. ATP d. oxygen e. iron
Which substance can enter a cell by diffusion without having to be digested?
A. water B. protein C. starch D. fat