{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture _6 - Energy, Enzymes and Metabolism

Lecture _6 - Energy, Enzymes and Metabolism - Energy...

Info icon This preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Energy Enzymes and Metabolism Energy, Enzymes and Metabolism Lecture #6 Campbell – Reece, 8th Edition Reading Assignment: Ch t 8 Chapters 8 BIOL 203 – Spring 2010 Ralph Feuer
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Overview: The Energy of Life The living cell is a miniature chemical factory thousands of reactions occur The cell Extracts energy and applies energy to perform work Some organisms even convert energy to light Bioluminescence E i i f li ht th Emission of light as the result of a chemical reaction Bioluminescence in Fungi
Image of page 2
Organization of the Chemistry of Life into Metabolic Pathways Enzyme 1 Enzyme 2 Enzyme 3 D C B A Reaction 1 Reaction 3 Reaction 2 Starting molecule Product An organism’s metabolism transforms matter and energy Subject to the laws of thermodynamics Metabolism The totality of an organism’s chemical reactions An emergent property of life that arises from interactions between molecules within the cell A metabolic pathway begins with a specific molecule and ends with a product Each step is catalyzed by a specific enzyme
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Catabolic and Anabolic Pathways Catabolic pathways Release energy by breaking down complex molecules into simpler compounds Cellular respiration The breakdown of glucose in the presence of oxygen Example of a pathway of catabolism Anabolic pathways Consume energy to build complex molecules from simpler ones Th th i f t i f i The synthesis of protein from amino acids is an example of anabolism Bioenergetics The study of how organisms manage their energy resources
Image of page 4
Forms of Energy Energy The capacity to cause change Energy exists in various forms Diving converts potential energy to kinetic energy. A diver has more potential energy on the platform than in the water. Some of which can perform work Kinetic energy Energy associated with motion Heat (thermal energy) Kinetic energy associated with random movement of atoms or molecules Potential energy Energy that matter possesses because of its location or structure Chemical energy Potential energy available for release in a chemical reaction E b d f f Energy can be converted from one form to another Climbing up converts the kinetic energy of muscle movement to potential energy. A diver has less potential energy in the water than on the platform.
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
The Laws of Energy Transformation Thermodynamics The study of energy t nsf m ti ns transformations A closed system is isolated from its surroundings Liquid in a thermos Open system Energy and matter can be transferred between the system and its surroundings Organisms are open systems
Image of page 6
The First Law of Thermodynamics According to the first law of thermodynamics The energy of the universe is constant Energy can be transferred and transformed Chemical energy But it cannot be created or destroyed The first law Also called the principle of conservation of energy
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern