Test Your Knowledge On Lipids!
Short interactive quiz to follow a presentation on Lipids
- 1.
The label on a container of margarine lists 'hydrogenated vegetable oil' as the major ingredient. What is the result of adding hydrogens to vegetable oil?
- A.
The hydrogenated vegetable oil has a lower melting point.
- B.
The hydrogenated vegetable oil stays solid at room temperature.
- C.
The hydrogenated vegetable oil has more "kinks" in the fatty acid chains.
- D.
The hydrogenated vegetable oil has fewer trans fatty acids.
- E.
The hydrogenated vegetable oil is less likely to clog arteries.
Correct Answer
B. The hydrogenated vegetable oil stays solid at room temperature.Explanation
By adding hydrogen to the unsaturated vegetable oil, the result is a saturated fatty acid. The vegetable oil is now 'saturated' with hydrogen. This causes the oil to solidify at room temperature and therefore, produce margarine.Rate this question:
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- 2.
Large organic molecules are usually assembled by polymerization of a few kinds of simple subunits. Which of the following is an exception to this statement?
- A.
A steroid
- B.
Cellulose
- C.
DNA
- D.
An enzyme
- E.
A contractile protein
Correct Answer
A. A steroidExplanation
Steroids are an exception to the statement because they are not assembled by polymerization of simple subunits. Steroids are a class of organic compounds that have a specific structure and are derived from cholesterol. They are composed of four interconnected carbon rings and have various functional groups attached to them. Unlike polymers, which are made up of repeating subunits, steroids have a unique and complex structure that is not formed through polymerization. Therefore, a steroid is an exception to the statement that large organic molecules are usually assembled by polymerization of simple subunits.Rate this question:
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- 3.
A phospholipid is a type of lipid which makes up cell membranes. Which of the following does not characterize a phospholipid?
- A.
A phosphate functional group
- B.
A hydrophilic head and hydrophobic tails
- C.
The ability to form a bilayer
- D.
A hydrophobic head and hydrophilic tails
- E.
An ester bond between glycerol and fatty acids
Correct Answer
D. A hydrophobic head and hydrophilic tailsExplanation
A phospholipid is composed of a hydrophilic (water-loving) head and hydrophobic (water-hating) tails. This arrangement allows phospholipids to form a bilayer, which is a characteristic feature of cell membranes. Additionally, a phospholipid contains a phosphate functional group and an ester bond between glycerol and fatty acids. However, a phospholipid does not have a hydrophobic head and hydrophilic tails, as it is the opposite - hydrophilic head and hydrophobic tails.Rate this question:
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- 4.
Steroids are specialized lipids composed of four fused carbon rings. Based on this knowledge, what would you expect to be the chemical formula of a steroid?
- A.
CO2
- B.
C96H150O9
- C.
C4H12
- D.
C27H46O
- E.
NH3
Correct Answer
D. C27H46OExplanation
The formula C27 H46 O is the formula for cholesterol, a specialized steroid in animals.Rate this question:
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- 5.
The primary function of fats is...
- A.
To provide structure within specialized cells
- B.
To secrete fatty acids into the body at a moderate rate
- C.
To store energy
- D.
To act as risk factors for diseases, such as cardiovascular diease
- E.
Act as a hydrophobic element in the body to ward off excess water
Correct Answer
C. To store energyExplanation
Fats primarily function to store energy in the body. They are a concentrated source of energy, providing more than double the amount of calories per gram compared to carbohydrates and proteins. When the body has excess energy from food, it converts it into fat and stores it for later use. This stored fat can then be broken down and used as fuel when the body needs energy between meals or during periods of physical activity.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
Oct 24, 2013Quiz Created by
Blakealexisdyer
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