Practice Questions

One molecule of water is released during formation of each

A. Hydrogen bond
B. Ester bond
C. Peptide bond in proteins
D. Glycosidic bond in starch

Esterification releases one water molecule per ester bond formed.

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Jun 29, 2026

Storage lipids differ from membrane lipids primarily because storage lipids

A. Contain phosphate groups
B. Lack phosphate groups
C. Contain nitrogen only
D. Are proteins

Triglycerides lack phosphate groups and function mainly in energy storage.

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Jun 29, 2026

Increased double bonds within fatty acid chains generally lower the

A. Membrane fluidity
B. Melting point
C. Solubility in organic solvents
D. Number of ester bonds

Double bonds prevent close packing, lowering the melting point.

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Jun 29, 2026

The alcohol component of naturally occurring triglycerides is

A. Ethanol
B. Glycerol
C. Methanol
D. Propanol

Glycerol is a three-carbon alcohol forming the backbone of triglycerides.

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Jun 29, 2026

Formation of triglycerides is an example of

A. Hydrolysis reaction
B. Condensation reaction
C. Oxidation reaction
D. Reduction reaction

Esterification is a condensation reaction because water is removed.

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Jun 29, 2026

Triglycerides are considered neutral fats because they

A. Contain no phosphate group
B. Possess neutral amino acids
C. Lack ester bonds
D. Contain only proteins

Neutral fats are uncharged due to the absence of phosphate groups.

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Jun 29, 2026

The phosphate-containing head of a phospholipid is directed toward

A. The lipid core
B. Aqueous surroundings
C. Cholesterol molecules
D. Fatty acid chains

The polar head interacts with water inside and outside the cell.

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Jun 29, 2026

Fatty acids containing only single covalent bonds between carbon atoms are

A. Unsaturated
B. Saturated
C. Aromatic
D. Branched-chain alcohols

Saturated fatty acids lack carbon-carbon double bonds.

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Jun 29, 2026

Digestion of dietary fats is facilitated by bile salts because they

A. Hydrolyze triglycerides
B. Emulsify fats
C. Produce glycerol
D. Synthesize phospholipids

Bile salts break large fat droplets into smaller droplets, increasing surface area for lipase.

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Jun 29, 2026

Membrane bilayers form spontaneously because phospholipids are

A. Hydrophobic only
B. Amphipathic molecules
C. Completely non-polar
D. Highly acidic molecules

Amphipathic molecules contain both hydrophilic and hydrophobic regions, allowing bilayer formation.

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Jun 29, 2026
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