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

How many different standard amino acids are commonly found in proteins in nature?

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Verified step by step guidance

Understand the question: The problem is asking for the number of standard amino acids commonly found in proteins in nature. These are the building blocks of proteins and are encoded by the genetic code.

Recall the concept: Proteins are made up of amino acids, and there are 20 standard amino acids that are encoded by the genetic code and commonly found in proteins. These amino acids have distinct side chains and properties.

Eliminate incorrect options: The options '10', '4', and '64' are incorrect because they do not represent the number of standard amino acids. For example, '64' refers to the number of codons in the genetic code, not amino acids.

Confirm the correct answer: The correct answer is '20', as this is the universally accepted number of standard amino acids found in proteins.

Review the significance: Understanding the number of standard amino acids is fundamental in biochemistry, as these amino acids determine protein structure and function.