Which statement about phospholipids is incorrect? a) Because...

Name: Problem 13, Chapter 2: What Is Life? A Guide to Biology
Uploaded: 2020-06-17T03:45:34-08:00
Duration: 17 s
Channel: Emily Marty
Description: Which statement about phospholipids is incorrect? a) Because their phosphate groups repel each other, they are used as organisms' chief form of short-term energy. b) They are hydrophobic at one end. c) They are hydrophilic at one end. d) They are a major constituent of cell membranes. e) They contain glycerol linked to fatty acids.

Which statement about phospholipids is incorrect? a) Because their phosphate groups repel each other, they are used as organisms' chief form of short-term energy. b) They are hydrophobic at one end. c) They are hydrophilic at one end. d) They are a major constituent of cell membranes. e) They contain glycerol linked to fatty acids.

Which statement about phospholipids is incorrect?
a) Because their phosphate groups repel each other, they are used as organisms' chief form of short-term energy.
b) They are hydrophobic at one end.
c) They are hydrophilic at one end.
d) They are a major constituent of cell membranes.
e) They contain glycerol linked to fatty acids.

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Key Concepts

Lipid Roles in Energy Storage vs Structural Functions

Different classes of lipids have specialized roles; while triglycerides function primarily as long-term energy reserves, phospholipids are mainly involved in structural functions within cell membranes. Understanding the distinction between these functions is important in biochemistry and cell biology.

Cell Membrane Composition

The cell membrane is primarily composed of a phospholipid bilayer, where the hydrophobic tails face inward away from water and the hydrophilic heads face the aqueous surroundings. This arrangement creates an effective barrier that maintains cellular integrity and mediates communication with the environment.

Amphipathic Molecules

Amphipathic molecules possess both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts. This dual nature is crucial for the self-assembly of these molecules into bilayers, which is fundamental for forming cell membranes and facilitating compartmentalization in biological systems.

Phospholipid Structure

Phospholipids are composed of a glycerol backbone attached to fatty acid chains and a phosphate group. This structure gives them distinct regions that contribute to their amphipathic character, which is key to their role in building cell membranes.

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