Transcript How do archaebacteria tolerate high temperatures of geysers

How do archaebacteria tolerate high
temperatures of geysers? Amino acids with
strong bonds prevent protein denaturation.
(Carl Woese: prof in IB/MCB at UI)
How do blood and
tissues of Antarctic
fish keep from freezing?
Art DeVries - IB prof
• anti-freeze system:
dissolved glycerol +
glycoproteins interfere with
ice formation and lower
freezing point below OC.
• super-cooling:
glycoproteins coat particles;
prevent ice crystals from
forming around ‘seed’.
Overall, adaptation to the physical environment
depends on reaching compromises between
opposing functions to increase the individual’s
chance of survival, growth and reproduction in a
particular environment.
Objectives
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What are physical challenges and solutions to:
pH
CO2 and PS pathways
O2
Light quality and quantity
Daylength
Heat and temperature
Sample exam question
Each of 3 evergreen tree species is restricted to certain soils in Oregon. Each is
transplanted to grow in habitats with each soil type. Shown in the table is
the growth response of each species grown in each soil type (acid=high in
H+; normal; serpentine= high in Mg++).
1.
2.
3.
Develop an ‘if…then’ hypothesis…prediction for this experiment.
The growth of which species coincide with the prediction and lend support
to the hypothesis?
Propose an ecological factor that may be restricting growth of Pygmy
cypress in its native acid soil.
Soil Type
Lodgepole Pygmy
Cypress
pine
Sargent
Cypress
Acid
5*
3*
3
Normal
3
25
12
Serpentine
3
10
20*
* = native to this soil type
Vocabulary
Chapte r 3 Adaptation to Aquatic and Terrestrial Environments
water potential
osmosis
active transport
stomates
li ght response curve
C3 photo synthesis*
solutes
osmotic potential
transpiration
li ght quali ty
compensation point
C4 photo synthesis*
photo period
homeostasis
poikil othermi c
torpor
hyperosmotic
negative feedback
ectotherm
countercurre nt circulation
heavy meetal
semi permeable
tension-cohesion theory
li ght quantity (intensity)
saturation point
crassulacean acid
metaboli sm (CAM)*
hypoosmotic
homeothermy
endotherm