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 nitrogenous base, if present in a nucleic acid, would indicate that the molecule is RNA and not DNA?

Adenine

Thymine

Uracil

Guanine

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Verified step by step guidance

Understand the difference between DNA and RNA: DNA contains the nitrogenous bases adenine (A), thymine (T), cytosine (C), and guanine (G), while RNA contains adenine (A), uracil (U), cytosine (C), and guanine (G). RNA replaces thymine with uracil.

Identify the nitrogenous bases listed in the problem: Adenine, Thymine, Uracil, and Guanine.

Recall that the presence of uracil is a distinguishing feature of RNA, as DNA does not contain uracil.

Compare the options provided in the problem to determine which base is unique to RNA. Uracil is the correct answer because it is found in RNA but not in DNA.

Conclude that the presence of uracil in a nucleic acid indicates that the molecule is RNA and not DNA.