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

3. Amino Acids

Amino Acid Groups

Biochemistry

3. Amino Acids

Amino Acid Groups

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Multiple Choice

Compared to carbohydrates and lipids, which element is unique to protein-containing molecules?

Nitrogen (N)

Hydrogen (H)

Carbon (C)

Oxygen (O)

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Verified step by step guidance

Step 1: Begin by recalling the basic chemical composition of carbohydrates and lipids. Both carbohydrates and lipids are primarily composed of carbon (C), hydrogen (H), and oxygen (O). These elements are common to many biomolecules.

Step 2: Consider the unique structural components of proteins. Proteins are made up of amino acids, which contain an amine group (-NH2) and a carboxyl group (-COOH). The amine group introduces nitrogen (N) into the molecular structure.

Step 3: Compare the elements found in proteins to those found in carbohydrates and lipids. Nitrogen (N) is not a significant component of carbohydrates or lipids, but it is a defining element in proteins due to the presence of the amine group.

Step 4: Understand the significance of nitrogen in proteins. Nitrogen is essential for forming peptide bonds between amino acids, which are the building blocks of proteins.

Step 5: Conclude that nitrogen (N) is the element unique to protein-containing molecules, distinguishing them from carbohydrates and lipids.