SCI 135 / McDarby NOTES


Chapter One - LIFE


Definition of “living” (NOT “it can die”).


List varies from source to source.









Basic Attributes:

Internal Organization.
          Protein-Based chemistry & DNA coding.
                    Genes.  T
echnically.
                    Cells.
                              Unicellular / Single-celled,
                              Multicellular.
                              Single-celled Colonials.
                              Organelles.

          Higher organization levels.
                    Tissues, organs, organ systems...
                    Individuals, populations,
                              communities, ecosystems.






Use and Transform Energy.

Energy that runs everything
          starts as “free” form in environment.

First-level transformations:
          Chemosynthesis.           Photosynthesis.

Second-level transformations:
          Respiration.           ATP.
          Metabolism.

Producers, Consumers, Decomposers.
          Materials & Energy. 













Interactions with environment.


Senses, responses, intake, metabolites.













Reproduction.

Genetic systems.  DNA, copied and passed.

Sexual Reproduction.
          Definition.           Advantage, Disadvantage.
                    Variation.

Asexual Reproduction.
          Definition.           Advantage, Disadvantage.
                   
Main way disadvantage is avoided.
                             
2 reasons it works.

Growth and Development.
          Why needed.









Evolution of Populations.

Background: Types, fossils, changes.
          How fossils get made.

Evolution by Natural Selection.
          "Average individual"
          Tied to current environmental conditions.
                    Condition changes drive most evolution.
                    Importance of variation in populations.










What about viruses?

How viruses work.
          Living: reproduction, organized, evolution.
          Not:  Metabolism, Interactions, Growth &
                    Development, Cellularity.







 
     
 

 

 

Introduction to Biology - Molecules & Cells.
For SCI-135.

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