__________ produce memory cells when activated.

A. B lymphocytes
B. T lymphocytes
C. macrophages
D. two of the above


Answer:
A. B lymphocytes
B. T lymphocytes

Biology & Microbiology

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The three domains of life are ____

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Human insulin for diabetics is now produced by transgenic ________

a. yeast b. E. coli c. jellyfish d. cattle

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Select the correct descriptions of the choroid layer of the human eye.

a. Has an extensive blood supply. b. Absorbs stray light. c. Contains a dark pigment. d. all of the above

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Where does the female gametophyte form in flowering plants?

a. in a stamen b. in a carpel c. in a corolla d. in a receptacle

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