Natural Science CLEP Prep Practice Exam

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Prepare for the CLEP Natural Science Exam with our comprehensive study materials and practice questions. Test your knowledge and ace the exam by mastering key concepts.

Practice this question and more.

What is the smallest structural unit of an organism?

Tissue
Cells
DNA
Organ

The correct answer is: Cells

Cells are the smallest structural unit of an organism because they are responsible for carrying out all of the essential functions of life. Tissue and organs are made up of multiple cells, so they are not the smallest unit. DNA is also not the smallest unit as it is a molecule that makes up genes and chromosomes within the cell.