Use the drop-down menu to select the answer that completes each sentence.
Although it contains organelles, the
is the smallest functional unit of an organism that is alive.
are structures within the cell that perform different specific functions, such as breaking down old
material or building new biomolecules.
All organelles are contained by a membrane, and the nucleus is wrapped in a double membrane called the
Although it is best known for storing the cell's DNA, the
copied and protected.
is an active place where this DNA is