Antigens may be processed for presentation by
A. macrophages.
B. dendritic cells.
C. erythrocytes.
D. T cytotoxic cells.
E. macrophages AND dendritic cells.
E
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Compare mitosis and meiosis. Which statement is accurate?
a. Meiosis I is more like mitosis than is meiosis II. b. Both processes result in four cells. c. Synapsis (pairing of chromosomes) occurs in both. d. Chromatids are present only in mitosis. e. Meiosis II resembles mitosis.
The odontophore of molluscs is part of the:
a. digestive system. b. nervous system. c. excretory system. d. defense system. e. reproductive system.
The movement of 25-year-old fertile individuals between Mexico and Canada will eventually
contribute to: a. genetic drift. b. directional selection. c. natural selection. d. gene flow. e. mutation.
The only diploid cell of the life cycle of basidiomycetes is produced within the basidium by
A. mitosis. B. budding. C. karyogamy. D. meiosis. E. ascus bursting.