Multiple Choice
Which of the following is false?
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2. Chemical Components of Cells
Four Classes of Macromolecules
Multiple Choice
In terms of molecular structure, how is a phospholipid different from a triglyceride?
A
A phospholipid has two fatty acid tails and a phosphate-containing head group, whereas a triglyceride has three fatty acid tails esterified to glycerol.
B
A phospholipid has three fatty acid tails and no phosphate group, whereas a triglyceride has two fatty acid tails and a phosphate head group.
C
A phospholipid is primarily composed of monosaccharides, whereas a triglyceride is primarily composed of disaccharides.
D
A phospholipid is a polymer of amino acids, whereas a triglyceride is a polymer of nucleotides.
Verified step by step guidance1
Step 1: Understand the basic structure of a triglyceride. A triglyceride consists of a glycerol backbone attached to three fatty acid chains through ester bonds.
Step 2: Understand the basic structure of a phospholipid. A phospholipid also has a glycerol backbone, but it is attached to only two fatty acid chains and one phosphate-containing group.
Step 3: Compare the number of fatty acid tails. Triglycerides have three fatty acid tails, while phospholipids have two fatty acid tails.
Step 4: Identify the presence of the phosphate group. Phospholipids have a phosphate-containing head group, which is absent in triglycerides.
Step 5: Summarize the key difference: phospholipids have two fatty acid tails and a phosphate head group, whereas triglycerides have three fatty acid tails and no phosphate group.
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