A characteristic of all modern, living cells is ____

a. a semi-permeable membrane keeping the internal environment of the cell separate from the external
environment
b. nucleic acids linked in a sequence to form multiple large macromolecule chains
c. a requirement for the nucleic acids to be contained behind a nuclear membrane
d. a mechanism of converting energy from the sun
e. a method of converting protein changes into nucleic acids


ANSWER: a

Biology & Microbiology

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