During growth, unicellular D. discoideum monitor their cell density relative to that of their bacterial food source by secreting a glycoprotein called prestarvation factor at a constant rate.

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#Id: 7114

#Unit 6. System Physiology – Plant

In the absence of ethylene, ETR1 and the other ethylene receptors activate the kinase activity of CTR1. This leads to a repression of the ethylene response pathway, possibly through a MAP kinase cascade. 

The binding of ethylene to the ETR1 dimer results in its inactivation, which causes CTR1 to become inactive.

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#Id: 8891

#Unit 2. Cellular Organization

Kinetochores assemble on regions of chromosomal DNA marked by a centromere-specific H3 histone variant called CENP-A.

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#Id: 2822

#Unit 13. Methods in Biology

In Ion-exchange chromatography Cation exchangers possess negatively charged groups and these will attract positively charged cations & Anion exchangers have positively charged groups that will attract negatively charged anions

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#Id: 5433

#Unit 7. System Physiology – Animal

Important factors in the establishment of the normal resting membrane potential:

Na+-K+ pump

K+ “leak” channels

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#Id: 3244

#Unit 3. Fundamental Processes

DNA also undergoes depurination by spontaneous hydrolysis of the N-glycosyl linkage, and this produces an abasic site (i.e., deoxyribose lacking a base) in the DNA.