Question

free response questions
please answer in complete sentences...3 - 5 sentences per question

1. explain the difference between passive transport and active transport. give an example of each.

Explanation:

Passive transport moves substances down a concentration gradient without energy input, like diffusion of oxygen across cell membranes. Active transport moves substances against a concentration gradient and requires energy (ATP). An example is the sodium - potassium pump that moves sodium out and potassium into cells.

Answer:

Passive transport occurs down a concentration gradient without energy use, e.g., oxygen diffusion across cell membranes. Active transport moves substances against a concentration gradient and needs energy (ATP), like the sodium - potassium pump operation in cells.