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37 Cards in this Set

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What does a tRNA do?
tRNAs carry amino acids during translation
What end of a tRNA is an amino acid attached to?
3' end
Name the 4 RNA binding sites
-mRNA binding site
-A site
-P site
-E site
Where does translation occur?
ribosomes
Ancestors of plants
multicellular green algae
shared features of plants (4)
-chloroplasts with similar photosynthetic pigments
-cell walls containing cellulose
-main storage polysaccharide is starch
-molecular features
different features of plants (2)
-algae adapted to acuatic environment
-plants adapted to terrestrial environment
key adaptations to life on land (4)
-obtaining resources from 2 locations
-supporting the plant body
-maintaining moisture
-reproducing on land
main problem for terrestrial plants?
dissication
when were land plants (bryophites) first present?
475 MYA
origin of vascular plants?
420mya
origin of seed plants
360mya
what does xylem transport
Water and minerals
what does phloem transport
nutrients
when was the emergence of flowering plants
140mya
Describe for MONOCOTS:
1) # cotyledons
2) Leaf veins
3) Stems
4) flowers
5) roots
1) 1
2) parallel
3) Complex arrangement
4) multiples of 3
5) fibrous
Describe for DICOTS:
1) # cotyledons
2) Leaf veins
3) Stems
4) flowers
5) roots
1) 2
2) branched
3) ring
4) multiples of 4, 5
5) taproot
2 systems of plant body
Roots, shoots
3 organs of plant system
roots, stems, leaves
How are the stolons modified?
run above ground surface
How are rhizomes special stems?
they are horizontal stems that grow underground
Describe the specialization of tubers
they are specialized for food storage
-most abundant cell type
-alive when mature
-only thin primary wall
-food storage, photosynthesis, aerobic respiration
parenchyma cells
-living cells, elongated
-only primary wall that is unevenly thickened
-support
collenchyma cells
-rigid secondary cell wall with lignin
-dead at maturity
-support
-fibre
-sclereid
sclerenchyma
-rigid secondary walls with lignin
-dead when mature
-support
-in xylem
tracheids and vessel elements
-thin primary walls, no secondary walls
-alive when mature, but lose most organelles
-metabolic support
in phloem
sieve-tube members
3 types of plant tissue
dermal tissue
ground tissue
vascular tissue
mesophyll
ground tissue
facilitates gas exchange and photosynthesis
what is bulk flow?
movement of a fluid driven by pressure
What kind of pressure is used in phloem?
hydrostatic pressure
What kind of pressure is used in xylem
root pressure and negative pressure
Describe the transpiration-cohesion-tension mechanism
-water moves down a potential gradient
-water column in xylem is under tension
-weight of water column is supported by cohesion among water molecules and adhesion to the xylem walls.
What drives the TCT process?
as water evaporates from the leaves, the water column is pulled up.
What happens in high turgor?
Stomata open
What happens in low turgor?
Stomata close
3 Factors plants sense to regulate stomatal opening:
-CO2 in leaf
-light
-water stress