Examine the structures of macromolecules in appendix I. Which type has the most electrons to donate? Suggest why carbohydrates are usually the primary source of energy for bacteria that use organic molecules as energy sources?
To determine: The type of macromolecule that has the most electrons to donate.
Introduction: All living organisms have organic molecules and macromolecules. These may be carbohydrates, lipids, proteins or nucleic acids. Macromolecules are large molecules that are commonly formed by the polymerization of subunits.
Explanation of Solution
Carbohydrates consist of many carbon-hydrogen (C-H) and carbon-carbon (C-C) bonds. These bonds are the source of electrons. Thus, in comparison to other macromolecules such as proteins, lipids, and nucleic acid carbohydrates have more electrons to donate.
To determine: The reason that why carbohydrates are usually the primary source of energy for bacteria that use organic molecules as energy sources.
Introduction: All living organisms have organic molecules and macromolecules. These may be carbohydrates, lipids, proteins or nucleic acids. Macromolecules are large molecules that are commonly formed by the polymerization of subunits.
Explanation of Solution
Chemoautotrophic bacteria depend on organic sources such as sugar, fat, carbohydrate and proteins to obtain electrons and carbon. However, carbohydrates are the macromolecules that act as a large source of electrons. That is why they are used by bacteria as the primary source of energy for the cell.
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Chapter 10 Solutions
Prescott's Microbiology
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