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Ch. 4 - Cell Metabolism: Bioenergetics, Enzymes, and RespirationWorksheetSee all chapters
All Chapters
Ch. 1 - Introduction to Physiology
Ch. 2 - Molecules and Molecular Interactions
Ch. 3 - Cells and Tissues
Ch. 4 - Cell Metabolism: Bioenergetics, Enzymes, and Respiration
Ch. 5 - Membrane Dynamics
Ch. 6 - Cell Communication
Ch. 7 - Integumentary System
Ch. 8 - Bone and Cartilage
Ch. 9 - Skeletal System
Ch. 10 - Joints
Ch. 11 - Muscles
Ch. 12 - The Nervous System I: Neurons and Neuronal Networks
Ch. 13 - The Nervous System II: The Central Nervous System
Ch. 14 - The Autonomic Nervous System
Ch. 15 - Sensory Physiology
Ch. 16 - The Endocrine System
Ch. 17 - Cardiovascular Physiology I: The Heart
Ch. 18 - Cardiovascular Physiology II: Blood, Blood Vessels, Circulation, and Exchange
Ch. 19 - The Urinary System
Ch. 20 - Respiratory Physiology
Ch. 21 - Acid-Base Balance-- Controlling Blood pH
Ch. 22 - Introduction to the Immune System
Ch. 23 The Lymphatic System
Ch. 23 - The Digestive System
Ch. 24 - Regulation of Metabolism and Energy Balance
Ch. 25 - Human Sexual Reproduction and Development

Concept #1: Enzymes as Catalysts

Concept #2: Enzymes as Proteins

Concept #3: Enzymes and Multi-Step Pathways

Practice: In a solution with 10 mM of enzyme and 100 mM of substrate, a particular reaction proceeds at a rate of 10 mM/sec. If the concentration of substrate is increased to 300 mM, the reaction continues to proceed at a rate of 10 mM/sec. Which of the following explains this phenomenon?

Practice: Pepsin is an enzyme in the stomach that digests protein. It works best at a pH of 2. When pepsin gets into the small intestine, where the pH is about 5-6, pepsin stops working. Which of the following explains the decrease in the activity of pepsin in the duodenum?