As a young biologist, Charles Darwin had expected the living plants of temperate South America would resemble those of temperate Europe, but he was surprised to find that they more closely resembled the plants of tropical South America. The biological explanation for this observation is most properly associated with the field of

#Question id: 4440

#Unit 3. Fundamental Processes

Some more DNA-dependent RNA polymerases have been identified in recent years, These are found only in plants, where they transcribe small interfering RNAs involved in transcriptional silencing;

#Question id: 4441

#Unit 3. Fundamental Processes

Which DNA-dependent RNA polymerases  are closely related to Pol II and clearly evolved from that enzyme relatively recently, some of their subunits are identical to those from Pol II, encoded by the same genes, and the others are from recently duplicated copies;

#Question id: 4442

#Unit 3. Fundamental Processes

The bacterial RNA polymerase is closely related to the eukaryotic polymerases pecifically, the two large subunits ,b and b’ , are homologous to the

#Question id: 4443

#Unit 3. Fundamental Processes

The alpha subunits of bacterial RNA polymerase is closely related to the eukaryotic polymerases, is homologous to the,

#Question id: 4444

#Unit 3. Fundamental Processes

The homologous omega subunit of bacterial RNA polymerase in eukaryotic polymerases is,

#Question id: 4445

#Unit 3. Fundamental Processes

The active site, which is made up of RPB1 and RPB2, from both these subunits, is found at the base of the pincers within a region called the “active center cleft” . The active site works according to the two-metal ion catalytic mechanism for nucleotide addition proposed for all types of polymerase;