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 increases in the 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.
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The initial circumstance that led some to believe that Abraham Lincoln had Marfan syndrome was that ____ had the disease
a. one of Lincoln's descendants b. Lincoln's sister c. a descendent of Lincoln's great-great-grandfather d. DNA analysis on Lincoln's skull determined that he e. Photographs of Lincoln provided physical evidence that he
A danger in using E. coli in cloning is that
A. E. coli could cause disease. B. the human cells may reject the insertion. C. the exons may invert the introns. D. the outer membrane is toxic to humans.
All of the following are true about the structure of DNA except
a. short strands of DNA are contained in chromosomes inside the nucleus of a cell. b. every DNA nucleotide contains a sugar, a phosphate group, and a base. c. DNA consists of two strands of nucleotides joined by hydrogen bonds. d. the long strands of nucleotides are twisted into a double helix.
Instead of oxygen________ may utilize nitrate or sulfate as their final electron acceptors
Fill in the blank(s) with the appropriate word(s).