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Carbon: The Central Atom Characteristics

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Questions and Answers

Which of the following statements about lipids is NOT true?

All lipids are polymers that can be broken down into smaller subunits. (correct)
Steroids are classified as a type of lipid.
Phospholipids are a primary component of cell membranes.
Lipids are composed of carbon, hydrogen, and oxygen.

What is the primary function of true (neutral) fats in the human body?

To provide cushioning for organs.
To serve as energy storage molecules. (correct)
To act as hormones for cellular signaling.
To form the structural basis of cell membranes.

Which of the following statements about the structure of true (neutral) fats is correct?

They are polymers made up of repeating units of glycerol and fatty acids.
They are formed by the hydrolysis of glycerol and fatty acids.
They are composed of a single glycerol molecule and one fatty acid.
They are formed by dehydration synthesis between glycerol and fatty acids. (correct)

What is the main difference between saturated and unsaturated fats?

Saturated fats have as much hydrogen as possible, while unsaturated fats have fewer hydrogen atoms. (C) Signup and view all the answers

What is the primary structural difference between triglycerides, diglycerides, and monoglycerides?

The number of fatty acid chains they contain. (A) Signup and view all the answers

Which of the following is NOT a common function of fat deposits around organs like the eyes, kidneys, and heart?

Facilitating the transport of fat-soluble vitamins. (C) Signup and view all the answers

What is the primary factor that determines the polarity of a lipid molecule?

The presence and amount of oxygen atoms in the molecule. (A) Signup and view all the answers

Which of the following statements about the energy content of lipids and carbohydrates is correct?

Lipids have twice the energy content of carbohydrates per gram. (D) Signup and view all the answers

Which of the following molecules is NOT a component of a true (neutral) fat?

Phosphate groups (B) Signup and view all the answers

Which of the following statements about the physical properties of lipids is correct?

Saturated fats are solids at room temperature, while unsaturated fats are liquids. (B) Signup and view all the answers

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