A CD4+ T cell binds to an antigen only if this antigen
a. is in a complex with a class I MHC protein.
b. is in a complex with a class II MHC protein.
c. is in a complex with a class III MHC protein.
d. is NOT in a complex with MHC proteins.
e. is presented on the surface of a B cell.
B
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The abundance of cyanobacterial mats has greatly declined due to the evolution of
A) antimicrobial-producing fungi. B) bacteriophages. C) metazoan grazers. D) Proteobacteria.
A flower that lacks any one of its floral parts might be called:
A. misrepresented B. misinterpreted C. fatally flawed D. incomplete E. mostly complete
The oncogene that causes Burkitt lymphoma results from a
A) translocation that moves a proto-oncogene next to an antibody gene. B) point mutation in a proto-oncogene. C) virus that inserts next to a proto-oncogene. D) deletion of an anti-oncogene.
Blood plasma is 90% water.
Answer the following statement true (T) or false (F)