In E. coli, rRNA synthesis from the seven rRNA operons responds to cellular growth rate and to changes in the availability of crucial nutrients, particularly amino acids. The regulation coordinated with amino acid concentrations is known as the stringent response.

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#Unit 2. Cellular Organization

The GTPase cycle analogous to the GTP hydrolysis coupled to the initiation of translation on the ribosome.

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#Unit 13. Methods in Biology

In RPLC mobile phase is commonly water or aqueous buffers, methanol, acetonitrile or tetrahydrofuran, or mixtures of them.

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#Unit 5. Developmental Biology

The P2 cell produces juxtacrine protein APX-1(a Delta homologue)

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#Unit 8. Inheritance Biology

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#Unit 6. System Physiology – Plant

NodA is an N-acyltransferase that catalyzes the addition of a fatty acyl chain.

NodB is a chitin-oligosaccharide deacetylase that removes the acetyl group from the terminal nonreducing sugar.

NodC is a chitin-oligosaccharide synthase that links N-acetyl-D-glucosamine monomers.