An investigator transferred 100 μl of a 0.2% bpb solution to 900 μl of water and measures an absorbance of 0.3 at 590 nm. she wants to prepare another 1 ml sample with the same absorbance using a 0.5% bpb solution. how should she prepare thiskample? 1. add 75 μしof the bpb solution to 925 μl water. 2. add 250 μしof the bpb solution to 750 μl water. 3. add 25 μしof the bpb solution to 975 μl water. 4. add 40 μしof the bpb solution to 960 μl water.

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