1. DNA polymerase I is a single polypeptide of 103 kD. 

2. The chain can be cleaved into two parts by proteolytic treatment. The larger cleavage product (68 kD) is called the Klenow fragment. It is used in synthetic reactions in vitro. 

3. It contains the polymerase and the proofreading 3’–5’ exonuclease activities.

TLS Online TPP Program

#Id: 5949

#Unit 10. Ecological Principles

Trophic-level transfer efficiency

 

TLS Online TPP Program

#Id: 5950

#Unit 10. Ecological Principles

Trophic-level transfer efficiency is low for the two reasons

a- Many organisms cannot digest all their prey.  

b- Much of the energy assimilated by animals is used in maintenance.

c- The dead organisms and feces become dinner for decomposers.

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#Id: 5951

#Unit 10. Ecological Principles

Consumption efficiency 

Consumption efficiency is the proportion of production at one trophic level (Prod n -1) that is eaten by, or ingested, by the next trophic level (In)

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#Id: 5952

#Unit 10. Ecological Principles

Consumption efficiencies  Forests range from 1–2%.  In grasslands, most plants are non woody range from 30–60%.  In aquatic ecosystems (most plant and algal biomass can be consumed by herbivores) range from  60–99%.

TLS Online TPP Program

#Id: 5953

#Unit 10. Ecological Principles

Consumption efficiencies for carnivores are typically higher than those of herbivores and vary from 5–100% Vertebrate predators commonly consume more than 50% of their prey.

Consumption efficiency of terrestrial herbivore range between 0-15 %, means 85 – 100% NET terrestrial plant goes into decomposer chain.

TLS Online TPP Program

#Id: 5954

#Unit 10. Ecological Principles

Assimilation efficiency  Assimilation efficiency is the proportion of ingested energy that is assimilated into the bloodstream (An)