Transcription that begins at promoters is specific, directed by the s-subunit

TLS Online TPP Program

#Id: 85

#Unit 5. Developmental Biology

Commitment

At this stage the cell or tissue does not appear phenotypically different from its uncommitted state, its developmental fate has become restricted.

TLS Online TPP Program

#Id: 6500

#Unit 3. Fundamental Processes

To extend elongation into the transcription unit, a kinase complex called P-TEFb is required. P-TEFb contains the CDK9 kinase, which is a member of the kinase family that controls the cell cycle. P-TEFb acts on the CTD to phosphorylate it further on serine 2 of the heptapeptide repeat.

TLS Online TPP Program

#Id: 1611

#Unit 4. Cell Communication and Cell Signaling

Structures of TLR2/1 with a bound lipopeptide and TLR3 with dsRNA.

TLS Online TPP Program

#Id: 6467

#Unit 3. Fundamental Processes

There are five common subunits in all three RNA Polymerases

Rpb5

Rpb6

Rpb8

Rpb10

Rpb12

TLS Online TPP Program

#Id: 8444

#Unit 1. Molecules and their Interaction Relevant to Biology

Both the pi helix and the 310 helix occur rarely and usually only at the ends of a helices or as single-tum helices. They are not energetically favorable, since the backbone atoms are too tightly packed in the 310 helix and so loosely packed in the n helix that there is a hole through the middle. 

Only in the a helix are the backbone atoms properly packed to provide a stable structure.