In Comparing Simple Diffusion to Facilitated Diffusion, You Note That

question 9

Multiple Choice

In comparing simple diffusion to facilitated diffusion, you note that:

• A)both require a concentration gradient.
• B)both require a specific carrier or protein channel.
• C)both require ATP.
• D)both can move substances up, as well as down, a concentration gradient.

---

Definitions:

Fixed Cost

Costs that do not vary with the level of output, remaining constant even if production is zero.

Variable Costs

Costs that change in proportion to the level of production or business activity, such as materials and labor directly involved in manufacturing.

Lawn-mowing

The act of cutting the grass of a lawn to maintain its appearance and health.

Perfectly Competitive

A market structure where there are many buyers and sellers, all of whom have negligible impact on the market price.