The start point is usually (90% of the time) a purine. It is common for the start point to be the central base in the sequence CAT, but the conservation of this triplet is not great enough to regard it as an obligatory signal.

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#Id: 7005

#Unit 5. Developmental Biology

 Precursor cell, is widely used to denote any ancestral cell type (either stem cell or progenitor cell) of a particular lineage; it is often used when such distinctions do not matter or are not known.

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#Id: 3004

#Unit 13. Methods in Biology

For isopycnic separation , density centrifugation is continued until the buoyant density
of the particle of interest and the density of the gradient are equal.

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#Id: 10390

#Unit 4. Cell Communication and Cell Signaling

Four stages of the evolutionary progression of cancer:

Initiation→Cancer progression → Evasion of cancer cell elimination  → Tumor growth and dispersal 

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#Id: 1570

#Unit 4. Cell Communication and Cell Signaling

Homologs

LRP in vertebrates = Arrow in Drosophila.

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#Id: 2301

#Unit 3. Fundamental Processes

The overall reaction rate for the bacterial RNA polymerase can be as fast as 40–50 nucleotides/ second at 37°C for most transcripts; this is about the same as the rate of translation (15 amino acids/sec), but much slower than the rate of DNA replication (800 bp/sec).