Thin descending and thin ascending segments, have thin epithelial membranes with no brush borders, few mitochondria, & minimal levels of metabolic activity.

TLS Online TPP Program

#Id: 6810

#Unit 3. Fundamental Processes

RNA-dependent RNA polymerase (RdRP), an additional enzyme required in many cases of RNAi including centromeric silencing in fission yeast.

TLS Online TPP Program

#Id: 6811

#Unit 3. Fundamental Processes

TLS Online TPP Program

#Id: 6812

#Unit 3. Fundamental Processes

RdRP has not yet been identified in mammalian cells, and high efficiency there likely results from the fact that slicing is catalytic— that is, each RISC can cleave several mRNAs.

TLS Online TPP Program

#Id: 6850

#Unit 3. Fundamental Processes

TLS Online TPP Program

#Id: 6851

#Unit 3. Fundamental Processes

SANT-domain-containing proteins interact preferentially with unmodified histone tails.

TLS Online TPP Program

#Id: 6852

#Unit 3. Fundamental Processes