Lecture 2 Summary
• 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.
• 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
• 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,
• Plastids are versatile and can change from one into another
• 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
• Maintains cell shape.
• Membrane of vacuole is called tonoplast.
Plant Cell Structure