Which best describes the effect of j. j. thomson’s discovery?
the accepted model of the atom was changed.

the accepted model of the atom was supported.

cathode ray tubes were no longer used in experiments due to poor results.

cathode ray tubes became the only instrument of use in the study of atoms

The correct answer will be option A-the accepted model of the atom was changed.

Explanation:

J.J Thomson discovered the electrons by cathode ray tube experiment in 1897 and realized that the accepted model of atom as proposed by the Dalton has problems as he stated that "atom is indivisible".

The discovery of sub-atomic particles-electrons in his experiments showed that the atom can be divided into sub-atomic particles and he proposed the pudding model of the  atom which changed the accepted model of atom at that time.

Thus, option A-the accepted model of the atom was changed is the correct answer.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.