MAPK and MEK are intracellular signaling proteins that mediate cell division induced by growth factors. When mutations in the normal MAPK and MEK genes result in an abnormally high level of MAPK and MEK activity and an increased rate of cell division, then the mutated gene is called a(n)
A. spliceosome.
B. transposon.
C. tumor-suppressor gene.
D. oncogene.
E. None of the choices are correct.
D. oncogene.
Biology & Microbiology
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Antibodies are __________
a. produced by B-cells b. produced by T-cells c. recognized as nonself d. pathogens
Biology & Microbiology
________ is the perennially frozen subsurface that develops in boreal and arctic systems where the ground temperatures remain below 0°C for extended periods of time
Fill in the blank(s) with correct word
Biology & Microbiology
The most advanced stone tools were made by:
a. Homo habilis. b. Homo erectus. c. Neandertals. d. Cro-Magnons. e. Homo africanus.
Biology & Microbiology
Structures located at the ends of eukaryotic chromosomes are called ________
A) recessive inversions B) permissive mutations C) centromeres D) telomeres E) telomerases
Biology & Microbiology