Which cells are important elements that comprise antibody-mediated immunity?

A) B cells
B) cytotoxic T cells
C) helper T cells
D) macrophages


A

Biology & Microbiology

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Which is true of the poliomyelitis virus?

A. non-enveloped B. single-stranded DNA C. double-stranded RNA D. single-stranded RNA E. non-enveloped AND single-stranded RNA

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Bryophytes have which of the following?

a. true leaves b. two spore types c. true roots d. true stems e. one spore type

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Write the letter of the terrestrial biome with the lowest mean temperature next to 1. Sequence the

remaining biomes by increasing temperature, finishing by writing the letter of the biome with the highest mean temperature next to 4.

A. temperate deciduous forest B. savanna C. tundra D. boreal forest 1. 2. 3. 4.

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Changes in the shape of a cell usually involve a reorganization of the _____

A) nucleus B) cytoskeleton C) extracellular matrix D) transport proteins

Biology & Microbiology