Why is this extra control of two layers on trp operon needed?  The answer probably lies in the fact that repression of the trp operon is weak—much weaker.

TLS Online TPP Program

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#Unit 10. Ecological Principles

I-Predator carrying capacity: Predator can no longer drive prey to extinction. Stable coexistence

TLS Online TPP Program

#Id: 9121

#Unit 10. Ecological Principles

II- if a predator has multiple prey

If prey abundances are not strongly positively correlated then as one prey species becomes scarce, the predator can continue to feed and increase its population size

TLS Online TPP Program

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#Unit 10. Ecological Principles

One organism feeds on another but does not normally kill it. 

TLS Online TPP Program

#Id: 9123

#Unit 10. Ecological Principles

Infection resistance - The ability of a host to prevent an infection from occurring. 

Infection tolerance - The ability of a host to minimize the harm once an infection has occurred. 

Parasite load - The number of parasites of a given species that an individual host can harbor.

Vertical transmission - When a parasite is transmitted from a parent to its offspring.

TLS Online TPP Program

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#Unit 10. Ecological Principles

Parasites can be classified

Microparasites

Macroparasites

Ectoparasites

Endoparasites

TLS Online TPP Program

#Id: 9126

#Unit 10. Ecological Principles

Ectoparasite A parasite that lives on the outside of an organism.

Endoparasite A parasite that lives inside an organism.