Biology STAAR (State of Texas Assessments of Academic Readiness) Practice Test

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What is osmosis?

Active transport of glucose into cells
The diffusion of water across a membrane
The breakdown of glucose for energy
An energy production process in plants

The correct answer is: The diffusion of water across a membrane

Osmosis is defined as the diffusion of water across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration. This process is essential for maintaining cellular homeostasis, as it regulates the internal environment of cells by balancing water and solute concentrations. In biological systems, osmosis is critical for processes such as nutrient absorption and waste removal in cells, allowing them to function properly. The clarity of this definition aligns well with the characteristics of osmosis, emphasizing its role in water movement rather than the transport of other substances or energy production mechanisms. Understanding osmosis is fundamental in the study of cellular biology and how cells interact with their environments.