Table of contents
- 1. Overview of Cell Biology2h 49m
- 2. Chemical Components of Cells1h 14m
- 3. Energy1h 33m
- 4. DNA, Chromosomes, and Genomes2h 31m
- 5. DNA to RNA to Protein2h 31m
- 6. Proteins1h 36m
- 7. Gene Expression1h 42m
- 8. Membrane Structure1h 4m
- 9. Transport Across Membranes1h 52m
- 10. Anerobic Respiration1h 5m
- 11. Aerobic Respiration1h 11m
- 12. Photosynthesis52m
- 13. Intracellular Protein Transport2h 18m
- Membrane Enclosed Organelles19m
- Protein Sorting9m
- ER Processing and Transport20m
- Golgi Processing and Transport17m
- Vesicular Budding, Transport, and Coat Proteins15m
- Targeting Proteins to the Mitochondria and Chloroplast7m
- Lysosomal and Degradation Pathways10m
- Endocytic Pathways21m
- Exocytosis6m
- Peroxisomes5m
- Plant Vacuole4m
- 14. Cell Signaling1h 28m
- 15. Cytoskeleton and Cell Movement1h 39m
- 16. Cell Division3h 5m
- 17. Meiosis and Sexual Reproduction50m
- 18. Cell Junctions and Tissues48m
- 19. Stem Cells13m
- 20. Cancer44m
- 21. The Immune System1h 6m
- 22. Techniques in Cell Biology1h 41m
- The Light Microscope5m
- Electron Microscopy6m
- The Use of Radioisotopes4m
- Cell Culture8m
- Isolation and Purification of Proteins7m
- Studying Proteins9m
- Nucleic Acid Hybridization2m
- DNA Cloning12m
- Polymerase Chain Reaction - PCR6m
- DNA Sequencing5m
- DNA libraries5m
- DNA Transfer into Cells2m
- Tracking Protein Movement2m
- RNA interference4m
- Genetic Screens13m
- Bioinformatics3m
3. Energy
Enzymes
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following is not one of the three major conditions of enzymes?
A
Enzymes cannot be consumed by a reaction
B
Enzymes cannot be changed by a reaction
C
Enzymes do not effect the rate of the reaction, only the free energy
D
Enzymes do not effect the free energy of the reaction, only the reaction rate

1
Understand the role of enzymes: Enzymes are biological catalysts that speed up chemical reactions without being consumed or permanently altered in the process.
Identify the three major conditions of enzymes: Enzymes are not consumed by the reaction, they are not changed by the reaction, and they do not affect the free energy of the reaction.
Clarify the concept of free energy: Enzymes lower the activation energy required for a reaction, which increases the reaction rate, but they do not change the overall free energy change (ΔG) of the reaction.
Evaluate the given statements: The statement 'Enzymes do not affect the rate of the reaction, only the free energy' is incorrect because enzymes do affect the reaction rate by lowering the activation energy.
Conclude which statement is not a major condition: The incorrect statement about enzymes not affecting the reaction rate is the one that does not align with the fundamental properties of enzymes.
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