P bodies are dense cytoplasmic domains many times the size of a ribosome. They are sites of translational repression that contain no ribosomes or translation factors. They are also major sites of mRNA degradation in the cytoplasm. Exon-junction complexes upf complex functions in nonsense-mediated decay and induces degradation of the mRNA by P body–associated 5′→3′ exoribonuclease XRN1 

TLS Online TPP Program

#Id: 6584

#Unit 7. System Physiology – Animal

TLS Online TPP Program

#Id: 6865

#Unit 3. Fundamental Processes

E(var) mutations lie in genes whose products are needed to activate gene expression. They include members of the SWI/SNF complex

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

#Id: 6360

#Unit 2. Cellular Organization

Repressors impede access of RNA polymerase to the promoter and Activators enhance the RNA polymerase–promoter interaction.

TLS Online TPP Program

#Id: 4249

#Unit 12. Applied Biology

The most common antibiotics used are penicillin and streptomycin, which inhibit a wide spectrum of Gram-positive and Gram-negative bacteria. Penicillin acts by inhibiting the last step in bacterial cell wall synthesis while streptomycin blocks protein synthesis.