Loss of the zeta population 

Epidermal cell types do not fully regenerate in the absence of zeta neoblasts, the remaining neoblasts (likely sigma) and their derived cell types are unaffected.

TLS Online TPP Program

#Id: 8838

#Unit 6. System Physiology – Plant

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: 3668

#Unit 3. Fundamental Processes

The protein-coding region(s) of each mRNA is composed of a contiguous, non-overlapping string of codons called an open reading frame (commonly known as an ORF).

TLS Online TPP Program

#Id: 2161

#Unit 9. Diversity of Life Forms

BASIS OF CLASSIFICATION

Arrangement of cells, body symmetry, nature of coelom, diploblastic or triploblastic nature of the body wall, segmentation, presence or absence of notochord.

TLS Online TPP Program

#Id: 8637

#Unit 2. Cellular Organization

The G1 cyclin-CDK complex (Cln3-CDK in yeast) stimulates the formation of G1/S phase cyclin-CDKs, which initiate bud formation, centrosome duplication, and DNA replication.

TLS Online TPP Program

#Id: 5669

#Unit 7. System Physiology – Animal