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 of the following lists correctly identifies the five monomer units (nucleobases) found in nucleic acids?

Adenine, Thymine, Guanine, Cytosine, Lysine

Adenine, Thymine, Guanine, Cytosine, Arginine

Adenine, Thymine, Guanine, Cytosine, Uracil

Adenine, Thymine, Guanine, Cytosine, Histidine

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Verified step by step guidance

Step 1: Understand the context of the problem. Nucleic acids, such as DNA and RNA, are composed of monomer units called nucleotides. Each nucleotide consists of a sugar, a phosphate group, and a nitrogenous base (nucleobase). The question is asking about the five nucleobases found in nucleic acids.

Step 2: Recall the nucleobases found in DNA and RNA. DNA contains four nucleobases: Adenine (A), Thymine (T), Guanine (G), and Cytosine (C). RNA contains Adenine (A), Uracil (U), Guanine (G), and Cytosine (C). Note that Uracil replaces Thymine in RNA.

Step 3: Eliminate incorrect options. Lysine, Arginine, and Histidine are amino acids, not nucleobases. These options can be ruled out as they are unrelated to nucleic acids.

Step 4: Identify the correct list of nucleobases. The correct answer must include Adenine, Thymine, Guanine, Cytosine, and Uracil, as these are the five nucleobases found in nucleic acids (DNA and RNA collectively).

Step 5: Confirm the reasoning. The inclusion of Uracil in the correct answer reflects its role in RNA, while Thymine is specific to DNA. This distinction is key to understanding the composition of nucleic acids.