Chapter+5 - Chapter 5 The Working Cell Cool Fires Attract...

Info iconThis preview shows pages 1–23. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 5 The Working Cell Cool Fires Attract Mates and Meals Fireflies use light to send signals to potential mates Instead of using chemical signals like most other insects The light comes from a set of chemical reactions That occur in light-producing organs at the rear of the insect Females of some species Produce a light pattern that attracts males of other species, which are then eaten by the female ENERGY AND THE CELL Energy Is the capacity to perform work There are two types: 1. Kinetic Energy 2. Potential Energy KINETIC ENERGY Energy of motion Examples are Heat and Light POTENTIAL ENERGY Energy that can be stored Kinetic energy Potential energy Sound Two laws govern energy transformations Thermodynamics Is the study of energy transformations The First Law of Thermodynamics Energy cannot be created or destroyed Energy can be changed from one form to another Figure 5.2A The Second Law of Thermodynamics States that some energy is lost as heat 05_01EnergyConcepts_A.swf CHEMICAL REACTIONS Either store or release energy There are 2 types: Endergonic Exergonic ENDERGONIC Requires a net input of energy Potential energy of molecules Reactants Energy required Products Amount of energy required PHOTOSYNTHESIS The process whereby plants cells make sugar EXERGONIC REACTIONS A chemical reaction that releases energy Cellular Respiration A chemical process that uses oxygen to convert the chemical energy stored in fuel molecules to a form of chemical energy that the cell can use to perform work. Reactants Energy released Products Amount of energy released Potential energy of molecules Potential energy of molecules Reactants Energy required Products Amount of energy required Endothermic Reaction Exothermic Reaction Energy coupling Uses exergonic reactions to fuel endergonic reactions ATP Shuttles chemical energy and drives cellular work ATP powers nearly all forms of cellular work Stands for Adenosine triphosphate Adenosine consist of: Adenine A nitrogenous base Ribose (5 carbon sugar The energy in an ATP molecule Lies in the bonds between its phosphate groups Phosphate groups ATP Energy P P P P P P Hydrolysis Adenine Ribose H 2 O Adenosine diphosphate Adenosine Triphosphate + + ADP Figure 5.4A 3 MAIN TYPES OF CELLULAR WORK ATP drives endergonic reactions by phosphorylation Transferring a phosphate group from ATP to make molecules more reactive Figure 5.4B ATP 1. Chemical work 2. Mechanical work 3. Transport work P P P P P P P Molecule formed Protein moved Solute transported ADP + Product Reactants Motor protein Membrane protein Solute + ATP ADP + P Energy for endergonic reactions Energy from exergonic reactions P h o s p h o r y l...
View Full Document

Page1 / 57

Chapter+5 - Chapter 5 The Working Cell Cool Fires Attract...

This preview shows document pages 1 - 23. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online