The biosynthesis of chlorophylls and heme begins with the synthesis of δ‐aminolevulinic acid (ALA) from glutamic acid. 

Two molecules of ALA react to yield porphobilinogen (PBG). 

Four molecules of PBG form the ring structure of protoporphyrin IX, the common branch point for the synthesis of heme and chlorophyll. 

To make chlorophyll, a magnesium chelatase inserts Mg into the protoporphyrin IX ring

TLS Online TPP Program

#Id: 5409

#Unit 7. System Physiology – Animal

There are two major types of glial cells in the vertebrate nervous system:

Microglia

Macroglia

TLS Online TPP Program

#Id: 797

#Unit 3. Fundamental Processes

There are proteins so-called nut sites in the leader regions of both the 16S and 23S rRNA transcripts, forming antitermination complexes that inhibit the action of rho.

TLS Online TPP Program

#Id: 10124

#Unit 6. System Physiology – Plant

IAA enters the cell as 

IAAH

IAA-

TLS Online TPP Program

#Id: 7305

#Unit 12. Applied Biology

Use of biological organisms, such as, bacteria, fungi (usually), and plants to reduce or eliminate toxic pollutants from contaminated sites by degradation or assimilation in the atmosphere is called bioremediation. 

TLS Online TPP Program

#Id: 8228

#Unit 10. Ecological Principles

Spatial structure - The pattern of density and spacing of individuals in a population.