The origin recognition complex (ORC) is a highly conserved complex found in all eukaryotes.  It is composed of six proteins with a mass of 400 kD.  ORC binds to the yeast A and B1 elements on the A-T–rich strand and is associated with ARS elements throughout the cell cycle.

TLS Online TPP Program

#Id: 10204

#Unit 6. System Physiology – Plant

Cytokinin has been linked to the activation of a Cdc25- like phosphatase, whose role is to remove an inhibitory phosphate group from the Cdc2 kinase. 

Cytokinins elevate the expression of the CYCD3 gene, which encodes a D-type cyclin'

TLS Online TPP Program

#Id: 5813

#Unit 7. System Physiology – Animal

Zona glomerulosa lacks 17α-hydroxylase

Increases Na+ reabsorption Increases K+ secretion Increases H+ secretion

TLS Online TPP Program

#Id: 2266

#Unit 11. Evolution and Behavior

Evolutionary constraint are restrictions, limitations, or biases on the course or outcome of adaptive evolution.

TLS Online TPP Program

#Id: 8492

#Unit 1. Molecules and their Interaction Relevant to Biology

TLS Online TPP Program

#Id: 2578

#Unit 7. System Physiology – Animal

Isosmotic reabsorption is a hallmark of proximal tubular function: Solute and water reabsorption are coupled and are proportional to each other.