Fibroblast growth factor receptors (fgfrs) (fgfrs) are transmembrane proteins that regulate cellular processes such as cell proliferation and differentiation. the extracellular domains of fgfr fgfr proteins bind specifically to signaling molecules called fibroblast growth factors. the intracellular domains of fgfr fgfr proteins function as protein kinases, enzymes that transfer phosphate groups from atp atp to protein substrates. fgfr fgfr activation occurs when binding by fibroblast growth factors causes fgfr fgfr proteins in the plasma membrane to become closely associated with each other. the association of two fgfr fgfr proteins stimulates protein kinase activity, which triggers the activation of intracellular signaling pathways. a simplified model of fgfr fgfr activation is represented in figure 1. figure 1. a simplified model of fgfr fgfr activation which of the following changes in the fgfr fgfr signaling pathway is most likely to result in uncontrolled cell proliferation?

The tasmanian devil, a marsupial carnivore, is facing extinction due to devil facial tumor disease (dftd) which causes bulging cancerous lumps and lesions to erupt around the face and neck — often causing enough deformation to make seeing or eating difficult. dftd has evolved into a contagious cancer, a trait that is unique among cancers. devil mating behavior involves biting around the head and neck, allowing cells from one individual — especially cells from the crumbly dftd tumors — to be transferred to the wounds or face of a new individual. this marsupial was once found across australia, but sea levels rose, isolating the tasmanian population, while the australian population went extinct. what would be an outcome of genetic isolation that is likely to have impacted the spread of dftd? a) reduced territory puts diseased individuals in greater contact with non-diseased ones. b) inbreeding results in less variation in facial features so the cancer is generally fatal. c) genetic isolation has made it difficult for scientists to develop a vaccine against dftd. d) the lack of genetic variation in the immune system of tasmanian devils minimizes resistance to the disease.

If the nucleus of a cell was removed the cell wouldn’t be able to make proteins because

In order to study genetic mutations, scientists must study genetic material. which statement describes the genetic material scientists are most likely studying? a) they study alleles that contain chromosomes, which are rna. b) they study alleles that contain genes, which are chromosomes. c) they study chromosomes that contain genes, which are dna segments.