Biology Now with Physiology (Second Edition)
Biology Now with Physiology (Second Edition)
2nd Edition
ISBN: 9780393631791
Author: Anne Houtman, Megan Scudellari, Cindy Malone
Publisher: W. W. Norton & Company
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Chapter 23, Problem 1TQ
Summary Introduction

Energy is stored as glycogen in liver and the muscle cells of the human body. The most efficient form of energy is stored in the skeletal muscles. If the glycogen stores are fully occupied, then the additionally calorie is stored as fat in the body. Nutrients are obtained from foods that serve for various purposes, for example, energy storage.

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Answer to Problem 1TQ

Lipid stores more energy than carbohydrates and proteins since it contains more energy per gram. Therefore, option c is correct. 

Explanation of Solution

Justify the reasons for the correct statement:

Both carbohydrates and lipids are nutrients that can be used for storing energy. The capacities of these nutrients are different in storing energy. Lipids are not digested quickly. Therefore, more energy can be stored for a long term by the lipids. Carbohydrates are hydrolyzed easily and so the energy is transferred rapidly.

Option (c) is given as, “lipids”.

Hence, the option (c) is correct.

Justify the reasons for the incorrect statements:

Option (a) is given as, “proteins”.

Proteins stores less energy when compared to lipids and carbohydrates. Hence, it is a wrong answer.

Option (b) is given as, “carbohydrates”.

Proteins stores less energy when compared to carbohydrates. Hence, it is a wrong answer.

Option (d) is given as, “all of the above”.

Lipids are the most important nutrient for storing energy. One of the given options is correct. Hence, it is a wrong answer.

Hence, options (a), (b), and (d) are incorrect.

Conclusion

Lipids store twice the amount of energy as compared to carbohydrates as it contains more energy per gram.

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