Plant Anatomy Flashcards
What is the structure of a “typical” plant cell?
- eukaryotic
- 6 unique features
What are the 6 unique features?
- cell wall
- dictyosomes
- central vacuole
- plastids (chloroplast)
- peroxisomes
- plasmodesmata
What is another name for golgi apparatus?
dictyosomes
what are the 3 regions of mature vacuolated plant cells?
- Cell Wall
- Cytosol
- Vacuole
What does the plasma membrane do?
transport proteins regulate molecules between cytosol and cell wall
what does tonoplast do?
transport proteins in vacuolar membrane regulate molecules between cytosol and vacuole
what are the two compartments?
- non-living cell wall (Apoplast)
- living protoplasm (symplast)
what are the two major compartments?
- apoplast
- symplast
in plant tissues, what and what is continuous?
cell walls and cytosol from cell to cell
what is symplast?
continuum of living cytosol connected by plasmodesmata
Cytoplasmic continuum
What is apoplast?
continuum of non living cell wall continuum + extracellular spaces
What does apoplast compartment consist of?
cell wall
where is apoplast compartment present?
in all plant cells
except short-lived/protected cells - gametes
what is apoplast compartment composed of?
cellulose
why is apoplast compartment plays a vital role?
- cell communication
- support
- protection
what is apoplast compartment considered?
dead and extracellular vs part of cell
what cell walls are in apoplast compartment?
primary and secondary cell walls and middle lamella
what are the apoplast compartment cell walls composed of?
complex polysaccharides
- cellulose, hemicellulose
what is the basic unit of cell wall structure?
cellulose microfibril
what is the primary cell wall of apoplast compartment?
thin walls
where is the primary cell wall in apoplast compartment present in?
all plant cells, in young growing cells
when is primary cell wall formed?
outside of plasma membrane
- after cell division
what are primary cell walls of neighbouring cell walls glued together by?
middle lamella
what does symplast compartment includes?
plasma membrane and contents of protoplast
what are protoplast?
-cytoplasm/ cytosol (liquid, collodal phase)
- cytoskeleton
- membrane-bound organelles
( nucleus, ER, dictyosomes, vacuoles, mitochondria, plastids, microbodies, plasmodesmata)
what is the symplast compartment plasma membrane composed of?
phospholipid bilayer
what is the symplast compartment plasma membrane described as?
fluid mosaic model
what is the symplast compartment plasma membrane referred to as?
cell membrane or plasmalemma
Why is the symplast compartment plasma membrane fluidity?
bc of phospholipids
why is symplast compartment plasma membrane mosaic?
bc peripheral and integral proteins
what is the structure of the symplast compartment plasma membrane?
dynamic
what does the symplast compartment plasma membrane control?
-substance enter/leave cell
- turgor pressure within cell affecting cell growth
what is turgor pressure?
force within the cell that pushes the plasma membrane against the cell wall
What is the symplast compartment cytosol?
liquid matrix within the cell
True or False
symplast compartment cytosol includes organelles?
False
What is the symplast compartment cytoplasm?
all of the cell contents inside the plasma membrane except the nucleus
- includes all organelles, membrane systems, macromolecules, colloids, ions, small molecules, water
what is the symplast compartment of cytoskeleton?
3D network of filamentous proteins in cytosol
what does the symplast compartment cytoskeleton involve?
-spatial organization
- movement of organelles
- mitosis/meiosis –> spindle formation
- cytokinesis
- cytoplasmic streaming
What can the cytoskeleton proteins do in the symplast compartment cytoskeleton?
assemble and diassemble
What are the 3 main types of filaments in symplast compartment cytoskeleton?
- microtubules
- microfilaments
- intermediate filaments
what are the movement of organelles in symplast compartment cytoskeleton?
- organelles move within protoplast through “cytoplasmic streaming”
Where does the dictyosomes move in symplast compartment cytoskeleton?
move and collect near areas of synthesis (cell membranes and cell walls)
where does mitochondria move in symplast compartment cytoskeleton?
move to areas requiring energy (active transport)
where does chloroplasts move in symplast compartment cytoskeleton?
will move to optimize light capture