Multiple Choice
What compound is formed when positive sodium ions combine with negative chloride ions?
2. Atoms & Elements
Ions
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Why can't ions typically travel through the cell membrane?
A
Ions are repelled by the proteins in the cell membrane.
B
Ions are charged and cannot easily pass through the hydrophobic lipid bilayer.
C
Ions are too large to pass through the cell membrane.
D
Ions require energy to move across the cell membrane.
Verified step by step guidance1
Understand the structure of the cell membrane: The cell membrane is primarily composed of a lipid bilayer, which consists of hydrophobic (water-repelling) tails and hydrophilic (water-attracting) heads.
Recognize the nature of ions: Ions are charged particles, meaning they have either a positive or negative electrical charge.
Consider the interaction between ions and the lipid bilayer: The hydrophobic interior of the lipid bilayer repels charged particles, making it difficult for ions to pass through without assistance.
Explore the concept of transport proteins: To facilitate the movement of ions across the cell membrane, transport proteins such as ion channels and carriers are required. These proteins provide a pathway for ions to move through the membrane.
Understand the role of energy in ion transport: Some ions require energy to move across the cell membrane, especially when moving against their concentration gradient. This process is known as active transport and involves the use of ATP (adenosine triphosphate) to provide the necessary energy.
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