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

Peptide Bond

Biochemistry

4. Protein Structure

Peptide Bond

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Multiple Choice

Which statement about peptide hormones is FALSE?

Peptide hormones typically bind to cell surface receptors because they cannot cross the plasma membrane.

Peptide hormones are usually water-soluble and transported freely in the bloodstream.

Peptide hormones are generally hydrophobic and can easily diffuse through lipid bilayers.

Peptide hormones are synthesized as precursor proteins that are later processed to their active forms.

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Verified step by step guidance

Step 1: Understand the nature of peptide hormones. Peptide hormones are composed of amino acids and are generally hydrophilic (water-soluble). This property prevents them from easily crossing the hydrophobic lipid bilayer of the plasma membrane.

Step 2: Analyze how peptide hormones interact with cells. Due to their inability to cross the plasma membrane, peptide hormones typically bind to cell surface receptors, initiating signal transduction pathways inside the cell.

Step 3: Examine the transport mechanism of peptide hormones. Being water-soluble, peptide hormones are transported freely in the bloodstream without requiring carrier proteins, unlike hydrophobic hormones such as steroid hormones.

Step 4: Review the synthesis of peptide hormones. Peptide hormones are synthesized as inactive precursor proteins (preprohormones or prohormones) and are later processed into their active forms through enzymatic cleavage.

Step 5: Identify the false statement. The statement 'Peptide hormones are generally hydrophobic and can easily diffuse through lipid bilayers' is incorrect because peptide hormones are hydrophilic and cannot diffuse through the lipid bilayer without assistance.