QUESTION IMAGE
Question
determine whether each statement describes a property of phospholipids, triglycerides, or both.
complete the table.
table with columns: phospholipids, triglycerides; rows: contain nonpolar fatty acids, are energy-storage molecules, build cell membranes, contain a polar phosphate group
To solve this, we analyze each property based on the structures and functions of phospholipids and triglycerides:
1. Contain nonpolar fatty acids
- Phospholipids: Have two nonpolar fatty acid tails.
- Triglycerides: Have three nonpolar fatty acid chains.
Thus, both have nonpolar fatty acids.
2. Are energy - storage molecules
- Phospholipids: Mainly function in cell membranes, not energy storage.
- Triglycerides: Are the primary energy - storage lipids in organisms.
Thus, only triglycerides are energy - storage molecules.
3. Build cell membranes
- Phospholipids: Form the lipid bilayer of cell membranes (due to their amphipathic nature: polar head + nonpolar tails).
- Triglycerides: Do not participate in cell membrane structure.
Thus, only phospholipids build cell membranes.
4. Contain a polar phosphate group
- Phospholipids: Have a polar phosphate - containing head group.
- Triglycerides: Consist of glycerol and fatty acids, with no phosphate group.
Thus, only phospholipids contain a polar phosphate group.
Filling the Table:
| Property | phospholipids | triglycerides |
|---|---|---|
| are energy - storage molecules | ❌ | ✔️ |
| build cell membranes | ✔️ | ❌ |
| contain a polar phosphate group | ✔️ | ❌ |
(Note: Use checkmarks or "Yes"/"No" as per the table’s input format; the above shows the logical determination for each row.)
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To solve this, we analyze each property based on the structures and functions of phospholipids and triglycerides:
1. Contain nonpolar fatty acids
- Phospholipids: Have two nonpolar fatty acid tails.
- Triglycerides: Have three nonpolar fatty acid chains.
Thus, both have nonpolar fatty acids.
2. Are energy - storage molecules
- Phospholipids: Mainly function in cell membranes, not energy storage.
- Triglycerides: Are the primary energy - storage lipids in organisms.
Thus, only triglycerides are energy - storage molecules.
3. Build cell membranes
- Phospholipids: Form the lipid bilayer of cell membranes (due to their amphipathic nature: polar head + nonpolar tails).
- Triglycerides: Do not participate in cell membrane structure.
Thus, only phospholipids build cell membranes.
4. Contain a polar phosphate group
- Phospholipids: Have a polar phosphate - containing head group.
- Triglycerides: Consist of glycerol and fatty acids, with no phosphate group.
Thus, only phospholipids contain a polar phosphate group.
Filling the Table:
| Property | phospholipids | triglycerides |
|---|---|---|
| are energy - storage molecules | ❌ | ✔️ |
| build cell membranes | ✔️ | ❌ |
| contain a polar phosphate group | ✔️ | ❌ |
(Note: Use checkmarks or "Yes"/"No" as per the table’s input format; the above shows the logical determination for each row.)