Biology 3.3 Test Flashcards

No energy is needed because the substances are moving from an area where they have a higher concentration to an area where they have a lower concentration.

Facilitated diffusion involves movement with the help of other molecules, while diffusion occurs without assistance.

Substances that can squeeze between the lipid molecules in the plasma membrane, such as very small, hydrophobic molecules like oxygen and carbon dioxide.

<p>Osmosis</p> Signup and view all the answers

<p>Oxygen and carbon dioxide transport proteins.</p> Signup and view all the answers

<p>Active transport occurs when energy is needed for a substance to move across a plasma membrane.</p> Signup and view all the answers

<p>The sodium-potassium pump actively transports sodium ions out of the cell and potassium ions into the cell.</p> Signup and view all the answers

<p>Osmosis is the diffusion of water molecules across a membrane.</p> Signup and view all the answers

<p>Due to concentration differences.</p> Signup and view all the answers

<p>The movement of molecules across a cell membrane without requiring energy.</p> Signup and view all the answers

<p>The movement of molecules from a region of higher concentration to a region of lower concentration.</p> Signup and view all the answers

<p>The diffusion of water across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration.</p> Signup and view all the answers

<p>Isotonic, hypertonic, and hypotonic.</p> Signup and view all the answers

<p>Diffusion through transport proteins.</p> Signup and view all the answers

<p>The movement of molecules from a region of lower to higher concentration, against the concentration gradient.</p> Signup and view all the answers

<p>Includes processes such as endocytosis, phagocytosis, pinocytosis, and exocytosis.</p> Signup and view all the answers