Tuesday, September 22, 2009

Eukaryotic cells

Today, the classes looked at Eukaryotic cells - that is, cells that have their DNA contained inside of a membrane, the nucleus.  Eukaryote come from the Greek roots "Eu-", meaning "good", and "kary-", meaning kernel: literally translating as "good kernel."  That's a little egocentrism on the part of biologists.  Originally, we thought Eukaryotic cells were "good" because they were the type of cells we had - cells with nuclei.  Prokaryotic cells - or cells that came "before the kernel"- had no nucleus and therefore must be bad.

R4 drew, labeled, and annotated a cheek cell, while R6 drew, label, and annotated a Elodea cell.  That gives us two types of Eukaryotic cells, the animal cell and the plant cell.  There are many other types of Eukaryotes, including single-celled Eukaryotes like the Paramecium.  However, in general we'll be discussing plant and animal cells as our main examples of Eukaryotes.

Homework
Your homework is to finish any drawings you owe me, and also to pre-read pages 70-73 in your textbook about the endomembrane system.  Remember, pre-read means scan over the headings, diagrams, and captions.

-Mr. Hill

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