Which of the Following Statements Is Correct About Passive Diffusion

question 9

Multiple Choice

Which of the following statements is correct about passive diffusion?

• A) It is a process in which molecules move from a region of higher concentration to a region of lower concentration (or down a concentration gradient).
• B) It may require a transport protein.
• C) It is a process in which molecules move from a region of lower concentration to one of higher concentration (or up a concentration gradient).
• D) It requires an expenditure of energy by the cell.
• E) It involves movement of molecules down a concentration gradient and may require a transport protein.

---

Definitions:

Neurotransmitter

Chemical substances that transmit nerve impulses across a synapse from one neuron to another.

Motor Neuron

An efferent neuron that transmits impulses away from the central nervous system to skeletal muscle.

Thin Filament

Actin filaments within muscle cells that, along with thick filaments, play a crucial role in muscle contraction.

Actin

Actin is a protein that plays a vital role in cell movement and structure, forming filaments that are essential components of the cytoskeleton.