In BER,  DNA polymerase I initiates repair synthesis from the free 3’ hydroxyl at the nick, removing (with its 5’-3’ exonuclease activity) and replacing a portion of the damaged strand. 

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#Id: 9905

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 7478

#Unit 4. Cell Communication and Cell Signaling

IgM antibodies are produced first in a humoral immune response and tend to be of low affinity.

IgM molecules form pentamers that are stabilized by a single J-chain molecule.

This higher avidity of the pentamer compensates for the low affinity

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#Unit 2. Cellular Organization

Difference between necrotrophy, biotrophy and hemibiotrophy

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#Id: 4955

#Unit 6. System Physiology – Plant

Phytochrome is most heavily concentrated in the regions where dramatic developmental changes are occurring: the apical meristems of the epicotyl and root.

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#Id: 5100

#Unit 6. System Physiology – Plant

Second but distinct MYB-related protein, late elongated hypocotyl (LHY), has also been identified as a potential clock gene.