The concentration at which net change in CO2 is 0 defines the CO2 compensation point and reflects the CO2 concentration at which the rate of gross photosynthetic CO2  uptake exactly equals the respiration rate.

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#Id: 7892

#Unit 2. Cellular Organization

mtDNA is located in the mitochondrial matrix, and in the rapidly growing cells, mtDNA is often seen in regions devoid of densely stacked cristae.

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#Id: 2362

#Unit 5. Developmental Biology

Zeta and Sigma neoblasts are morphologically indistinguishable, but they express different gene regulatory networks.

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#Id: 6151

#Unit 3. Fundamental Processes

Even if cells cannot repair these lesions, there is a fail-safe mechanism that allows the replication machinery to bypass these sites of damage or tolerate the DNA damage. One mechanism of DNA damage tolerance is translesion synthesis. Although this mechanism is, as we shall see, highly error-prone and thus likely to introduce mutations, translesion synthesis spares the cell the worse fate of an incompletely replicated chromosome. A key feature of DNA damage tolerance is that the DNA lesion remains in the genome. DNA repair pathways can subsequently correct the lesion.

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#Id: 1528

#Unit 2. Cellular Organization

Many MAPs are positively charged and bind to microtubles through electrostatic interactions.

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#Id: 1344

#Unit 4. Cell Communication and Cell Signaling

RAS is connected to the membrane by a prenylated (lipid) tail.