Comparisons of the sequences of several bacterial sigma factors suggested conserved regions in E. coli s70  that interact directly with promoters DNA-binding regions of the sigma factor fold into independent domains in the protein regions 1.2, 2.3– 2.4, 3.0, and 4.1–4.2.

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#Id: 9191

#Unit 11. Evolution and Behavior

Types of selection

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#Id: 1918

#Unit 4. Cell Communication and Cell Signaling

Generation of antibodies to T-dependent antigens

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#Id: 10389

#Unit 4. Cell Communication and Cell Signaling

Class II, but not class I, presentation is inhibited by treatment of the cells with an agent that blocks endocytic processing within the cell (chloroquine).

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#Id: 2061

#Unit 8. Inheritance Biology

Number of phenotype =2n+1

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#Id: 8000

#Unit 10. Ecological Principles

No two different species can share the same niche but can have similar niches,  this is because of competition for resources like food, space etc

Two species cannot coexist permanently in a community if their niches are  identical