GED Science Practice 2026 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is the basic structural and functional unit of all organisms in biology?

Carbohydrate

Carbon Dioxide

Cell

The basic structural and functional unit of all organisms in biology is the cell. While carbohydrates, carbon dioxide, and cell membrane are all important components of living organisms, none of them on their own can encompass all the necessary functions and structures required for life. Carbohydrates are important macromolecules that provide energy and support for organisms, but they are not the fundamental unit of life. Carbon dioxide is an essential gas for photosynthesis in plants, but it's not found in all organisms and does not constitute their basic unit. The cell membrane is crucial for regulating what enters and leaves a cell, but it is only one part of a larger unit. The cell, however, is the smallest unit that can carry out all the necessary processes for an organism to survive and reproduce. Therefore, it is considered the basic structural and functional unit of all living organisms in biology.

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Cell Membrane

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