Question

1. what is active transport? 2. how is diffusion different from active transport? 3. what is homeostasis? 4. draw and label a model of active transport in the space below showing concentration. use arrows and words to label

Explanation:

1. Active transport is the movement of molecules across a cell membrane from an area of lower concentration to an area of higher concentration, against the concentration gradient. It requires cellular energy (usually ATP) and uses carrier proteins to move substances like calcium, potassium, and sodium across the membrane.
2. Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration, down the concentration gradient, and does not require energy input. It occurs due to the random motion of molecules. Active transport is different as it moves against the gradient and needs energy, while diffusion moves with the gradient and is energy - free.
3. Homeostasis is the ability of an organism or cell to maintain a relatively stable internal environment despite changes in external conditions. In the context of cell transport, active transport helps maintain homeostasis by controlling the movement of substances to keep the right concentrations of ions and molecules inside the cell.
4. [Here, a model could be a simple drawing of a cell membrane with arrows. Draw a cell membrane. For active transport, draw an arrow pointing from outside the cell (labeled as low - concentration area) to inside the cell (labeled as high - concentration area) and label it "Active Transport, requires energy (ATP)". You can also draw carrier proteins embedded in the membrane with the molecules being transported through them. Use words like "molecules", "cell membrane", "high concentration", "low concentration" to label the parts of the drawing.]

Answer:

1. Active transport is the movement of molecules across a cell membrane against the concentration gradient, requiring energy and carrier proteins.
2. Diffusion is passive movement down the concentration gradient without energy; active transport is against the gradient and energy - requiring.
3. Homeostasis is the maintenance of a stable internal environment; active transport aids in it by controlling substance movement.
4. [A drawing of a cell membrane with labeled arrows and components for active transport as described above.]