Which of the following statements about the cyclic electron flow system are true? This system makes use of components of photosystem I, plastocyanin, and the cytochrome b6f complex. In this process, electrons excited in P700 are transferred to NADP+. Whether or not this process is operational depends on the levels of NADPH--high concentrations favor this pathway. This system does not produce NADPH but does yield ATP.

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

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