To modify DNA at a new position requires the action of a de novo methyltransferase, which recognizes DNA by virtue of a specific sequence. It acts only on unmethylated DNA to add a methyl group to one strand.

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#Id: 3304

#Unit 6. System Physiology – Plant

Factors that slow the flow of electrons through the respiratory chain increase the formation of superoxide, perhaps by prolonging the lifetime of ^• O ₂ ^- generated in the Q cycle,

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#Id: 6541

#Unit 7. System Physiology – Animal

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#Id: 8215

#Unit 2. Cellular Organization

Autophagy can be either

• Nonselective autophagy

• Selective autophagy

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#Id: 7373

#Unit 5. Developmental Biology

At the same time, the protein products of the gap, pair-rule, and segment polarity genes interact to regulate another class of genes, the homeotic selector genes, whose transcription determines the developmental fate of each segment

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#Id: 8491

#Unit 1. Molecules and their Interaction Relevant to Biology

The peptide bond is estimated to have 40% double bond character