The immunoglobulin/s found on the surface of B cells is/are
A. IgD and IgE.
B. IgD only.
C. IgM only.
D. IgG only.
E. IgM and IgD.
Answer: E
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The transcription factor called SHOOT ROOT is involved in the specialization of root cells into what type of tissue?
A. Cortex. B. Epidermis. C. Endodermis. D. Pericyte.
Which of the following correctly shows a possible order of events resulting in allopatric speciation?
A. postzygotic reproductive isolation - geographic isolation - natural selection B. geographic isolation - prezygotic reproductive isolation - genetic drift C. geographic isolation - natural selection - prezygotic reproductive isolation D. natural selection - postzygotic reproductive isolation - geographic isolation E. natural selection - prezygotic reproductive isolation - postzygotic reproductive isolation
Which of the following features enable organisms like planarian to respire and exchange nutrients?
A. a trilobed gastrovascular cavity B. coelomic fluid C. an open circulatory system D. closed circulatory system
A keloid is defined as a(n):
a. excessive collage formation that often results in a hard, raised scar b. fibrous bands that can form internally after surgery c. tissue separation d. part of the healing process of larger scars