The principal estrogen secreted by the ovaries is β-estradiol.

TLS Online TPP Program

#Id: 9256

#Unit 6. System Physiology – Plant

The concentration at which net change in CO2 is 0 defines the CO2 compensation point and reflects the CO2 concentration at which the rate of gross photosynthetic CO2  uptake exactly equals the respiration rate.

TLS Online TPP Program

#Id: 1997

#Unit 3. Fundamental Processes

The polyadenylation reaction passes through two stages. 

First, a rather short oligo(A) sequence (10 residues) is added to the 3’ end. This reaction is absolutely dependent on the AAUAAA sequence and poly(A) polymerase performs it under the direction of the specificity factor. 

In the second phase, the nuclear poly(A) binding protein (PABP II) binds the oligo(A) tail to allow extension of the poly(A) tail to the full 200 residue length.

TLS Online TPP Program

#Id: 4560

#Unit 8. Inheritance Biology

RECESSIVE EPISTASIS

The recessive allele of one gene hides the expression of all alleles of another gene. Ex- coat color in Labrador retrievers

TLS Online TPP Program

#Id: 1378

#Unit 4. Cell Communication and Cell Signaling

Long-term regulation: 

• SOCS proteins

• Targets the receptor as well as JAK2 for degradation by the ubiquitin-proteasome pathway

TLS Online TPP Program

#Id: 3322

#Unit 6. System Physiology – Plant

V-class proton pumps cannot acidify the lumen of an organelle because these pumps are electrogenic.