Natural Science CLEP Prep Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the Natural Science CLEP Exam with comprehensive quizzes and multiple choice questions. Each question includes hints and explanations to help you succeed. Ace your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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.