Multiple Choice
Which of the following would be least likely to diffuse through a plasma membrane without the help of a transport protein?
6. The Membrane
Simple and Facilitated Diffusion
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Which of the following is false in regard to facilitated diffusion?
A
Facilitated diffusion requires a concentration gradient.
B
Facilitated diffusion can occur through protein channels.
C
Facilitated diffusion can occur by means of transport proteins.
D
Facilitated diffusion can move ions across membranes.
E
Facilitated diffusion requires the hydrolysis of ATP.
Verified step by step guidance1
Understand the concept of facilitated diffusion: Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport proteins. It does not require energy from ATP hydrolysis.
Identify the role of concentration gradient: Facilitated diffusion relies on a concentration gradient, where substances move from an area of higher concentration to an area of lower concentration.
Recognize the involvement of protein channels: Facilitated diffusion can occur through protein channels that provide a pathway for specific molecules or ions to pass through the membrane.
Acknowledge the function of transport proteins: Transport proteins, such as carrier proteins, assist in the movement of substances across the cell membrane during facilitated diffusion.
Clarify the energy requirement: Unlike active transport, facilitated diffusion does not require the hydrolysis of ATP, as it is a passive process driven by the concentration gradient.
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