During lymphocyte development, the major histocompatibility complex (MHC) plays a role in _______.
A. driving protein synthesis in cytotoxic T-cells
B. the recognition of self by the immune system and rejection of foreign tissue
C. stimulating plasma cells to produce more antibodies
D. allowing viruses to inject DNA or RNA into host cells
B. the recognition of self by the immune system and rejection of foreign tissue
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The enzyme ____ produces ____ DNA that is complementary to mRNA
a. reverse transcriptase; single-stranded b. reverse transcriptase; double-stranded c. DNA polymerase; single-stranded d. DNA polymerase; double-stranded e. RNA polymerase; single-stranded
Postzygotic reproductive isolation occurs
a. just after the union of the egg and sperm nuclei. b. during embryo development. c. during fetal development. d. after birth. e. with any of these.
Where are cell walls found?
a. in plant and fungal cells b. in plant cells only c. in fungal cells only d. in animal cells only
The CO2 produced in respiration comes mainly from
A. glycolysis. B. the Krebs cycle. C. the electron transport chain. D. All of the above processes generate CO2.