A Level Biology Practice Exam

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What does the fluid-mosaic model describe?

A structure of a DNA molecule
A model of the structure of a cell membrane
An illustration of cellular respiration
A representation of genetic inheritance

The correct answer is: A model of the structure of a cell membrane

The fluid-mosaic model describes the structure of a cell membrane, which is accurately represented in the answer provided. This model illustrates that the cell membrane is composed of a lipid bilayer with proteins distributed throughout, resembling a mosaic. The lipids in the bilayer can move laterally, providing fluidity and flexibility to the membrane. This dynamic nature is essential for various cellular processes, including the mobility of proteins and the movement of substances in and out of the cell. In contrast, the other options relate to different biological concepts. The structure of a DNA molecule involves a double helix configuration, while cellular respiration revolves around the biochemical pathways for energy production within cells. Genetic inheritance pertains to the transmission of genetic traits from one generation to the next, typically depicted through Punnett squares or family trees.