Medullary collecting duct is permeable to urea, and there are special urea transporters that facilitate urea diffusion across the luminal and basolateral membranes

TLS Online TPP Program

#Id: 2957

#Unit 3. Fundamental Processes

The yeast ARS elements satisfy the classic definition of an origin as a cis-acting sequence that causes DNA replication to initiate.

TLS Online TPP Program

#Id: 10109

#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: 8248

#Unit 1. Molecules and their Interaction Relevant to Biology

Van der Waals interaction is the weakest of all intermolecular attractions between molecules.

TLS Online TPP Program

#Id: 9987

#Unit 4. Cell Communication and Cell Signaling

Wnt ligands are recognized by Frizzled/retinoic acid-related orphan receptor (ROR)/receptor tyrosine kinase (RYK) receptor complexes

TLS Online TPP Program

#Id: 9522

#Unit 6. System Physiology – Plant

The bacterial blight pathogen of rice (Oryza sativa), Xanthomonas oryzae pv. oryzae, secretes a highly conserved sulfated peptide called Ax21, which mediates quorum sensing by controlling Xanthomonas motility, biofilm formation, and virulence.