Descending limb of the loop of Henle is permeable to water, due to the presence of aquaporin-1 in both the apical and basolateral membranes

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#Id: 8907

#Unit 2. Cellular Organization

Centromere associated cohesins are specifically protected from phosphorylation dependent removal by protein phosphatase 2A

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#Id: 3055

#Unit 10. Ecological Principles

The number of species should increase with increasing island size. This is also known as the species-area hypothesis.

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#Id: 1910

#Unit 4. Cell Communication and Cell Signaling

B- cell maturation

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#Id: 3412

#Unit 3. Fundamental Processes

SOS response in E. coli:

When DNA is extensively damaged (such as by UV light), DNA replication is halted and the number of single-strand gaps in the DNA increases.

RecA protein binds to this damaged, single-stranded DNA, activating the protein’s co-protease activity.

While bound to DNA, the RecA protein facilitates cleavage and inactivation of the LexA repressor. When the repressor is inactivated, the SOS genes, including RecA, are induced;

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#Id: 902

#Unit 13. Methods in Biology

Flow cytometry or FACS is the sine qua non (without which, nothing) of the modern immunologist’s toolbox.