Biol 120 - Lecture 2 notes.pdf

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Published on 15 Apr 2013
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Lecture 2 Summary
Introduction
Plant cells are totipotent
o This means that they have the ability to change
(differentiate) from one cell type to another.
o ie, stem cells; you can grow a whole plant from a
cluster of other cells; cloning.
Chloroplasts
Contain chlorophyll pigment; are the site of photosynthesis.
Larger than mitochondria (>5x)
Can have one or more chloroplasts
*Have two outer membranes and circular chromosome
have series of internal, membrane-bound sacs called
thylakoids.
Plastids
Plastids: plant organelles that make or store food or pigments
Chloroplasts: are a type of plastid; contain chlorophyll
pigment, and is the site of photosynthesis
Leucoplasts: mean “white”; lack pigments, ie – amyoplasts,
proteinoplasts, elaioplasts.
Plastids are versatile and can change from one into another
(note, totipotency!)
Vacuoles
can occupy 90% of the volume of mature plant cells.
latin vacuus, meaning “empty”.
DOES have contents, and plays important metabolic role.
Where toxic compounds, water & ions are stored;
Formation of crystals, and break down of larger
macromolecules.
Maintains cell shape.
Membrane of vacuole is called tonoplast.
Plant Cell Structure
Cytoskeleton
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