AEBI 120 Lecture Notes - Cell Theory, Nucleoid, Nucleolus

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Published on 29 Sep 2011
School
McGill University
Department
Biology (Agric & Envir Sc)
Course
AEBI 120
Professor
September 14th, 2011
Cells
Modern Cell Theory
-All living matter is made of cells
-Cells give rise to other cells
-All ordered metabolic reactions occur within cells
-All cells contain DNA which is transmitted from the parent to the offspring
Smaller cells are more productive and efficient because of the ratio of the surface area to the
volume, so they have a higher metabolism than large cells.
Cell Types
Prokaryotic cells
-bacteria
-no nucleus, so genetic material (DNA) floats in the
cytoplasm
-contain only cell walls and ribosomes
Eukaryotic cells
-Have cell walls, a nucleus (DNA surrounded by a membrane), and organelles (ribosomes,
mitochondria)
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