Which of the following statements regarding cyclin dependent kinase inhibitors is false? a. oncogenic signaling negatively regulates cdki’s. for example, akt signaling leads to cytoplasmic sequestration of cdki’s, and myc leads to transcriptional repression of cdki genes. b. some inhibitors are specific for the cyclin d: cdk4/6 complex. these inhibitors block progression past the r point. c. the cdki’s themselves are subject to positive regulation by cell stresses such as dna damage. d. some inhibitors are able to inactivate several cyclin: cdk complexes and therefore can promote cell cycle arrest at several checkpoints. e. all of the cdki’s have similar phosphatase activities.

Ithink all of these events

D. peatlands,grassland,swamps

Proteins are the workhorses of the cell, controlling virtually every reaction within as well as providing structure and serving as signals to other cells. proteins are long chains of  amino acids  , and the exact sequence of the amino acids determines the final structure and function of the protein. instructions for that sequence are encoded in  genes  . to make a particular protein, a messenger ribonucleic acid (mrna) copy is made from the gene (in the process called  transcription  ), and the mrna is transported to the  ribosome  . protein synthesis, also called  translation  , begins when the two ribosomal subunits link onto the mrna. this step, called initiation, is followed by elongation, in which successive amino acids are added to the growing chain, brought in by transfer rnas (trnas). in this step, the ribosome reads the  nucleotides  of mrna three by three, in units called  codons  , and matches each to three nucleotides on the trna, called the anticodon. finally, during termination, the ribosome unbinds from the mrna, and the  amino acid  chain goes on to be processed and folded to make the final, functional protein