Florida Biology EOC Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which statement accurately defines osmosis?

The movement of all types of molecules across a membrane

The specific movement of water molecules through a semi-permeable membrane

Osmosis is specifically defined as the movement of water molecules through a semi-permeable membrane. This process occurs when there is a difference in the concentration of solutes on either side of the membrane. Water molecules naturally migrate from an area of lower solute concentration (where there are fewer solute particles) to an area of higher solute concentration (where there are more solute particles) in order to achieve equilibrium. The semi-permeable nature of the membrane allows water to pass through while restricting the movement of solute molecules, which is a key characteristic that differentiates osmosis from other types of transport processes. This movement does not require energy, making it a passive process, and is critical for maintaining cellular functions and homeostasis in living organisms.

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The active transport of ions against a concentration gradient

The passive transport of nutrients into cells

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