The sequence AAUAAA is a signal for cleavage to generate a 3’ end of mRNA that is polyadenylated. Addition of poly(A) to nuclear RNA can be prevented by the analog 3’–deoxyadenosine known as cordycepin

TLS Online TPP Program

#Id: 5503

#Unit 10. Ecological Principles

Stress tolerators can survive and reproduce under extreme environmental conditions, such as very low water availability, very cold temperatures, or high salt concentrations.

Ex - Lichen, Mangrove plant, cacti, Deserts animal.

TLS Online TPP Program

#Id: 5504

#Unit 10. Ecological Principles

Intermediate - Many perennial herbs adopt a mixture of these strategies and tend to lie in the center of Grime’s triangle.One cannot be a good stress tolerator and a good competitor at the same time

TLS Online TPP Program

#Id: 5505

#Unit 10. Ecological Principles

Metapopulations

Separate Populations That Mutually Affect One Another via Dispersal Fragmented landscapes create fragmented populations, many of which may exchange individuals via migration, creating one linked population

TLS Online TPP Program

#Id: 5506

#Unit 10. Ecological Principles

If individuals in one patch go extinct, other individuals in other patches survive, and they supply individuals

TLS Online TPP Program

#Id: 5507

#Unit 10. Ecological Principles

The proportion of occupied patches will stabilize over time to 1− (x/m) x is the extinction rate of populations in patches per unit time m is the rate of movement between patches

TLS Online TPP Program

#Id: 5508

#Unit 10. Ecological Principles