Which of the following cells is responsible for rejection of transplanted organs?

a. NK cells
b. cytotoxic T cells
c. helper T cells
d. memory cytotoxic T cells


b

Biology & Microbiology

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The plant hormone that promotes dormancy in

some plants and seeds is a. abscisic acid. b. auxin. c. gibberellin. d. ethylene. e. none of these.

Biology & Microbiology

Lichens represent a symbiotic association between a fungus and a plant

Indicate whether the statement is true or false

Biology & Microbiology

Using the word bank below, identify the labeled structures in the picture (embryo, amnion, yolk sac, allantois, chorion, umbilical cord).

What will be an ideal response?

Biology & Microbiology

What is an oocyte?

A. Haploid animal egg B. Immature sperm C. Polar body arising from mitosis of the egg D. Immature, diploid animal egg E. Haploid germ cell

Biology & Microbiology