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

4. Protein Structure

Primary Structure of Protein

Biochemistry

4. Protein Structure

Primary Structure of Protein

Previous problemNext problem

Struggling with Biochemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following statements about protein primary structure is true?

The primary structure refers to the three-dimensional folding of the polypeptide chain.

The primary structure of a protein is determined by the sequence of amino acids linked by peptide bonds.

The primary structure is altered by changes in pH and temperature alone.

The primary structure is stabilized mainly by hydrogen bonds between side chains.

Previous problemNext problem

Verified step by step guidance

Step 1: Understand the concept of protein primary structure. The primary structure of a protein refers to the linear sequence of amino acids in the polypeptide chain, linked by peptide bonds. This sequence is unique to each protein and determines its overall structure and function.

Step 2: Analyze the first statement: 'The primary structure refers to the three-dimensional folding of the polypeptide chain.' This is incorrect because the three-dimensional folding is part of the tertiary structure, not the primary structure.

Step 3: Evaluate the second statement: 'The primary structure of a protein is determined by the sequence of amino acids linked by peptide bonds.' This is correct because the primary structure is defined by the specific order of amino acids connected by peptide bonds.

Step 4: Assess the third statement: 'The primary structure is altered by changes in pH and temperature alone.' This is incorrect because changes in pH and temperature typically affect higher levels of protein structure (secondary, tertiary, or quaternary) rather than the primary structure, which is covalently bonded and more stable.

Step 5: Examine the fourth statement: 'The primary structure is stabilized mainly by hydrogen bonds between side chains.' This is incorrect because the primary structure is stabilized by covalent peptide bonds, not hydrogen bonds, which are more relevant to secondary and tertiary structures.