Multiple Choice
Which of the following is not an advantage of active transport?
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6. The Membrane
Active Transport
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Why is energy required for active transport in cells?
A
To allow molecules to move through the lipid bilayer without assistance
B
To facilitate the passive diffusion of molecules
C
To enable molecules to move along their concentration gradient
D
To move molecules against their concentration gradient
Verified step by step guidance1
Understand that active transport is a process used by cells to move molecules across the cell membrane against their concentration gradient, which means from an area of lower concentration to an area of higher concentration.
Recognize that moving molecules against their concentration gradient requires energy because it is not a naturally occurring process like passive diffusion, which moves molecules from high to low concentration without energy.
Identify the source of energy for active transport, which is typically adenosine triphosphate (ATP). ATP provides the necessary energy to change the shape of transport proteins in the cell membrane, allowing them to move molecules against the gradient.
Consider the role of transport proteins, such as pumps, in active transport. These proteins bind to the molecules that need to be transported and use the energy from ATP to change their conformation and transport the molecules across the membrane.
Conclude that energy is required for active transport to move molecules against their concentration gradient, which is essential for maintaining cellular homeostasis and allowing cells to uptake necessary nutrients and expel waste products.
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