Multiple Choice
How does potassium (K^+) typically move across the cell membrane in animal cells?
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6. The Membrane
Biological Membranes
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Which part of the phospholipid is hydrophobic?
A
Fatty acid tails
B
Choline group
C
Glycerol backbone
D
Phosphate head
Verified step by step guidance1
Understand the structure of a phospholipid: A phospholipid is composed of a hydrophilic (water-attracting) head and hydrophobic (water-repelling) tails.
Identify the components of the phospholipid: The hydrophilic head consists of a phosphate group and sometimes a choline group, while the hydrophobic tails are made up of fatty acid chains.
Recall the definition of hydrophobic: Hydrophobic molecules repel water and are typically nonpolar, such as fatty acids.
Analyze the options provided: Fatty acid tails are nonpolar and hydrophobic, while the choline group, glycerol backbone, and phosphate head are polar and hydrophilic.
Conclude that the hydrophobic part of the phospholipid is the fatty acid tails, as they are nonpolar and repel water.
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