Unformatted text preview: Microbiology 303 Fall 2012 Lecture 14 Bioenerge8cs I Cell metabolism: the cell is a chemical factory Building a cell takes energy Energy is the capacity to cause change or do work Requirements for growth: Energy • Energy is the ability to do work • Cells need chemical energy to perform cellular func8ons, such as – biochemical reac8ons – movement – transport • Organisms that use energy stored in chemicals (chemical energy) are called chemotrophs • Organisms that convert light energy to chemical energy are called phototrophs Chemical energy is the poten1al energy of electrons Chemical energy metabolism involves oxida8on
reduc8on (redox) reac8ons Ared Electron donor: loses electrons A gets oxidized Aox Box Bred Electron acceptor: gains electrons B gets reduced = electron Ared + Box Aox + Bred Methane = electron donor = “energy source” Energy is released as electrons move to place of lower poten8al energy Electron transfer between molecules is some8mes associated with release of poten8al energy of electrons, captured by the cell as ATP, an energy carrier Electron donor: High poten8al energy electrons Ared Box Aox Bred Electron acceptor: Electrons are in posi8on of lower poten8al energy Ared is the “Energy source” but mu...
View Full Document
- Fall '12
What students are saying
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.
Kiran Temple University Fox School of Business ‘17, Course Hero Intern
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.
Dana University of Pennsylvania ‘17, Course Hero Intern
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.
Jill Tulane University ‘16, Course Hero Intern