Two bases in the non-template strand of the –10 element (A11 and T7) flip out from their base-stacking interactions and instead insert into pockets within the s protein where they make more favorable interactions

TLS Online TPP Program

#Id: 6283

#Unit 3. Fundamental Processes

TLS Online TPP Program

#Id: 1447

#Unit 4. Cell Communication and Cell Signaling

Tight junctions prevent the diffusion of: 

Macromolecules

Small water-soluble molecules

Ions

Membrane proteins 

Glycolipids

TLS Online TPP Program

#Id: 7134

#Unit 6. System Physiology – Plant

Brassinosteroids are synthesized from the plant sterol campesterol, which is similar in structure to cholesterol. Members of the cytochrome P450 monooxygenase (CYP) enzyme family that are associated with the ER catalyze most of the reactions in the brassinosteroid biosynthesis pathway.

Mevalonic acid serves as a precursor of the triterpenoid pathway and is condensed and transformed to 2,3-oxidosqualene which further undergoes modification to form major plant sterols like sitosterols and campesterols.

TLS Online TPP Program

#Id: 6733

#Unit 8. Inheritance Biology

TLS Online TPP Program

#Id: 6032

#Unit 3. Fundamental Processes

Synthesis of an Okazaki fragment displaces the RNA primer of the preceding fragment in the form of a “flap.”

the base of the flap is cleaved by the enzyme FEN1 (f lap endonuclease 1).  In this reaction, FEN1 functions as an endonuclease, but it also has a 5’–3’; exonuclease activity. In DNA repair reactions, FEN1 may cleave next to a displaced nucleotide and then use its exonuclease activity to remove adjacent material.