How do antigen-presenting cells (APCs) acquire the epitopes for presentation?
a. direct infection of the APC
b. exocytosis or secretion
c. phagocytosis or endocytosis
d. diffusion
c. phagocytosis or endocytosis
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The largest basal angiosperm group, ____, includes avocados and plants that are the sources of spices
a. Nymphaeales b. Austrobaileyales c. Magnoliales d. Chloranthales e. Amborella
HeLa cells have been used in research to
a. identify cell structures. b. study sickle cell anemia. c. study the effects of hyperoxia on cells. d. study the mechanisms of cancer. e. study various lung diseases.
In peas, the yellow allele is dominant over the green allele. A plant with yellow peas was crossed to a plant with green peas. The resulting plants were 50% yellow and 50% green. What is the genotype of the parents in this cross?
A) YY × yy B) YY × Yy C) Yy × yy D) Yy × Yy E) yy × yy
Which of the following is generally a hermaphrodite?
A. Pin worms B. Flukes C. Hook worms D. Tapeworm