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1. Carbohydrates and lipids are best described as:
A. Inorganic compounds made of nitrogen and phosphorus
B. Organic compounds mainly composed of carbon, hydrogen, and oxygen
C. Metallic compounds found in enzymes
D. Compounds consisting only of carbon and nitrogen
Correct Answer: B
2. What is the primary function of carbohydrates in living organisms?
A. Transport oxygen in blood
B. Provide energy and form structural components
C. Store genetic information
D. Regulate hormone production
Correct Answer: B
3. Which type of carbohydrate serves as the most important source of energy?
A. Steroids
B. Mono-, di-, and polysaccharides
,C. Proteins
D. Nucleotides
Correct Answer: B
4. Monosaccharides and disaccharides are generally:
A. Nonpolar and insoluble in water
B. Polar and soluble in water
C. Hydrophobic and insoluble
D. Structurally rigid polymers
Correct Answer: B
5. Polysaccharides are best described as:
A. Single sugar molecules
B. Lipid molecules bonded to sugars
C. Macromolecules formed by polymerization of sugars
D. Protein–carbohydrate complexes
Correct Answer: C
6. Which of the following is an example of a monosaccharide?
A. Starch
B. Glycogen
C. Glucose
D. Cellulose
Correct Answer: C
7. Which of the following is NOT a monosaccharide?
, A. Ribose
B. Fructose
C. Galactose
D. Starch
Correct Answer: D
8. A disaccharide is formed when:
A. Two polysaccharides combine
B. Two monosaccharides join through a condensation reaction
C. Three monosaccharides combine
D. A lipid bonds with a sugar
Correct Answer: B
9. The bond that links monosaccharides together in disaccharides is called a:
A. Peptide bond
B. Ester bond
C. Glycosidic bond
D. Hydrogen bond
Correct Answer: C
10. The formation of a disaccharide releases which molecule?
A. Carbon dioxide
B. Water
C. Oxygen
D. Nitrogen
Correct Answer: B