What phagocyte initiates inflammation?

A) natural killer cells
B) cytotoxic T cells
C) macrophages
D) mast cells
E) helper T cells


Ans: C) macrophages

Biology & Microbiology

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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.

Biology & Microbiology

True or false: Competition can only occur between members of the same species

A. true B. false

Biology & Microbiology

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

Biology & Microbiology

Which substance can enter a cell by diffusion without having to be digested?

A. water B. protein C. starch D. fat

Biology & Microbiology