DnaA is the E. coli licensing factor that must be made anew for each round of replication.

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#Id: 1238

#Unit 7. System Physiology – Animal

Corticotropin-releasing hormone (CRH) stimulates secretion of ACTH by corticotropes.

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#Id: 9232

#Unit 6. System Physiology – Plant

In photosynthesis, the relationship of O2 evolved to CO2 taken up is 1:1. 

In photorespiration, 3 O2 are taken up for every CO2 evolved.

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#Id: 9522

#Unit 6. System Physiology – Plant

The bacterial blight pathogen of rice (Oryza sativa), Xanthomonas oryzae pv. oryzae, secretes a highly conserved sulfated peptide called Ax21, which mediates quorum sensing by controlling Xanthomonas motility, biofilm formation, and virulence.

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#Id: 4922

#Unit 1. Molecules and their Interaction Relevant to Biology

Therefore, at fixed [S0], a plot of 1/v0 against [Io] (the Dixon plot) is linear. When [Io] = -Ki , it can be seen that 1/v0 = l!V max and is therefore independent of [S0], so Dixon plots for different values of [So] (but fixed [Eo]) intersect where [lo] = -Ki

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#Id: 2633

#Unit 13. Methods in Biology

The probe must span the sequence where the transcript starts or ends. After hybridizing the probe to the transcript, one applies S1 nuclease, which degrades only single-stranded DNA and RNA.