Two atoms have two different proton counts. This means that the atoms a. belong to two entirely different elements.
Selected:b. represent different isotopes of one element. This answer is incorrect.
c. are likely to react violently with each other.
d. might be different ions of the same elements.

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.

Select the correct answer from each drop-down menu. the lac operon in e. coli regulates genes that code for enzymes required for breakdown of lactose. the lac operon is operon that is activated in the presence of .

Which of the following are not matched correctly? cd8+: directly destroy infected or cancerous cells t reg cell: reduce the adaptive response once threat passes t l: activate cellular branch (cytotoxic t cells, macrophages, nk cells) t 2: stimulate b cells to make antibodies t (cd4+): mhc i