| Concepts | Questions | Media Resources |
6.1 Cells and the Flow of Energy - The first law of thermodynamics states that energy can neither be created nor destroyed but it can be changed from one form to another.
- The second law of thermodynamics states that when energy is changed from one form to another there is always a loss of usable energy in the form of heat.
| - Is the conversion of energy from one form to another 100% efficient? Explain.
Answer
- What is entropy and how do energy transformations in cells increase entropy?
Answer
| Essential Study Partner
Thermodynamics Explorations
Cell Chemistry: Thermodynamics |
6.2 Metabolic Reactions and Energy Transformations - In cells the breakdown of ATP, which releases energy, can be coupled to reactions that require an input of energy.
- ATP goes through a cycle: energy from glucose breakdown drives ATP synthesis and then ATP breakdown provides energy for cellular work.
| - Why are reactions sometimes coupled?
Answer
- What are three uses of energy from ATP in the cell?
Answer
| Essential Study Partner
Coupled Reactions
ATP Art Quiz
Endergonic and Exergonic Reactions |
6.3 Metabolic Pathways and Enzymes - Cells have metabolic pathways in which every reaction has a specific enzyme.
- Enzymes speed reactions because they have an active site where a specific reaction occurs.
- Environmental factors like temperature and pH affect the activity of enzymes.
- Inhibition of enzymes is a common way for cells to control enzyme activity.
- Cofactors sometimes assist enzymes when chemical reactions occur in cells.
| - What are enzymes and how do they help chemical reactions proceed?
Answer
- List several factors that affect enzyme speed.
Answer
| Essential Study Partner
Enzymes
Pathways Art Quizzes
Enzyme Catalytic Cycle
A Biochemical Pathway
Feedback Inhibition Animation Quizzes
Catalysis
Feedback Inhibition Explorations
Enzymes in Action: Kinetics |
6.4 Oxidation-Reduction and the Flow of Energy - Photosynthesis and cellular respiration are redox pathways that allow a flow of energy through all living things.
| - Why is photosynthesis called a redox pathway?
Answer
| |
