Cells
A) are composed of many types of tissues.
B) are found in plants and animals,but not bacteria.
C) are the smallest entity studied by biologists.
D) can be building blocks for complex organisms.
E) must contain DNA within a nucleus.

Question

Quizplus · Accepted Answer

Cells can serve as the building blocks for complex organisms, as they can differentiate and specialize to form specific tissues, organs, and systems. While many tissues are made up of cells, and cells do contain DNA, not all cells have a nucleus (such as prokaryotic cells, which are found in bacteria). Therefore, neither A, B, C, nor E are the best choices.