Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

1. Introduction to Biochemistry

Nucleic Acids

Biochemistry

1. Introduction to Biochemistry

Nucleic Acids

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Multiple Choice

Which sugar molecule is found in the backbone of DNA?

Deoxyribose

Fructose

Glucose

Ribose

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Verified step by step guidance

Understand the structure of DNA: DNA (Deoxyribonucleic Acid) is composed of a sugar-phosphate backbone and nitrogenous bases. The sugar molecule in the backbone is crucial for its structure and function.

Identify the type of sugar in DNA: The sugar in DNA is a pentose sugar, meaning it has five carbon atoms. This sugar is specifically deoxyribose, which is a modified form of ribose where one oxygen atom is removed from the hydroxyl group on the 2' carbon.

Compare the options provided: Fructose and glucose are hexose sugars (six carbon atoms) and are not part of the DNA structure. Ribose is a pentose sugar found in RNA, not DNA. Deoxyribose is the correct sugar found in DNA.

Understand the difference between ribose and deoxyribose: Ribose has a hydroxyl group (-OH) attached to the 2' carbon, while deoxyribose lacks this hydroxyl group, having only a hydrogen atom (-H) at the 2' position. This difference is key to distinguishing DNA from RNA.

Conclude that the sugar molecule found in the backbone of DNA is deoxyribose, as it is specifically designed to form the stable structure of DNA.