Select all of the following statements that are basic assumptions of the bohr model of the atom. atoms have a central nucleus with electrons in orbit about this nucleus. atoms are made of positive material with electrons fixed in place in this positive material. electrons can jump from one orbit to another around the nucleus. they must gain energy to jump to a higher level, and they release energy when jumping to a lower level. electrons orbit the nucleus, but the orbits can have only certain sizes and energy values. atoms are solid spheres of matter.

Achemist at a pharmaceutical company is measuring equilibrium constants for reactions in which drug candidate molecules bind to a protein involved in cancer. the drug molecules bind the protein in a 1: 1 ratio to form a drug-protein complex. the protein concentration in aqueous solution at 25 ˚c is 1.74 x10-6 m . drug a is introduced into the protein solution at an initial concentration of 2.00 x10-6m. drug b is introduced into a separate, identical protein solution at an initial concentration of 2.00 x10-6m. at equilibrium, the drug a-protein solution has an a-protein complex concentration of 1.00 x10-6m, and the drug b solution has a b-protein complex concentration of 1.40 x10-6m.a. calculate the kc value for the a-protein binding reaction.b. calculate the kc value for the b-protein binding reaction.c. assuming that the drug that binds more strongly will be more effective, which drug is the better choice for further research?