Temperature Flashcards
Vital force
It was thought that biological organisms have something inherent which was required to make bio end products
Thermodynamics
A chemist will say that all reaction follow Arrhenius equation
Arrhenius equation
k= Ae ^ Ea /RT
R= gas constant
Ea = activ energy
A = pre exponential factor
Arrhenius equation vs bio systems
Should only be a 2% rise in rate of reaction for 10•C rise from thermodynamics alone
Q10
Best describes the relationship between temp and biological processes
Rate of reaction is faster here than predicted by Arrhenius equation
Where should the q10 lie
Between 2 and 3 - for every 10 degrees rate either triples or doubles much greater than Arrhenius eq
Why is the q10 not the same as Arrhenius
- a biological system is not a single chemical reaction = not as simple as single test tube chem reaction
- biological systems use enzymes to reduce activation energy
Enzymes + thermal tolerance
Different species = different thermal tolerance - result of different structures and functions of enzymes
Different populations of same species may have different enzyme structure to meet thermal environments
How do enzymes affect thermal tolerance
Enzymes increase efficiency of bio reactions so when temp incr rate of reaction = exponential
Lethal temp - breaks down peptide bonds activity decreases
Heat capacity in seawater
Higher than H2O takes longer to heat up therefore is less affected by temp change
Eurythermal
Organisms w a wide temp range - thus wide distribution
Eg lanice chonchilega
Stenotherms
Narrow temperature range - specific to temperature possibly geographically isolated
Poikilotherms
Cold blooded - body temp tends to follow water around them
Homeotherms
Warm blooded - Body temp tends to be within equilibrium window
Conformers vs regulators
Conformers = internal match external environment
Regulators = regulates internal over a certain range - at extremes this regulation breaks down
