COMMUNITY ZONATION - One of the most noticeable features of communities is that the species composition of the community changes as one moves across the landscape. 

With the change in environmental conditions, some species become better able to survive and compete. 

TLS Online TPP Program

#Id: 6525

#Unit 7. System Physiology – Animal

Norepinephrine produces vasoconstriction via  α1 receptors, but epinephrine dilates the blood vessels in skeletal muscle and liver via β2 receptors

TLS Online TPP Program

#Id: 3646

#Unit 3. Fundamental Processes

All Class I enzymes aminoacylate their bound tRNA’s 3′-terminal 2′-OH group, whereas Class II enzymes charge the 3′-OH group.

TLS Online TPP Program

#Id: 104

#Unit 5. Developmental Biology

Syncytial specification uses elements of both autonomous and conditional specification.

TLS Online TPP Program

#Id: 790

#Unit 3. Fundamental Processes

Sequences of Rho dependent transcription termination

1. Rho binds a rut site. 

2. The rho factor then tracks along the RNA until it catches up to RNA polymerase. 

3. When the RNA polymerase reaches the termination site, rho first freezes the structure of the polymerase and then invades the exit channel to destabilize the enzyme, causing it to release the RNA. 

4. Pausing by the polymerase at the site of termination allows time for rho factor to translocate to the hybrid stretch.

TLS Online TPP Program

#Id: 7168

#Unit 5. Developmental Biology

Nieuwkoop center 

Dorsalmost vegetal cells of the blastula, which are capable of inducing the organizer dorsal vegetal cells can induce animal cells to become dorsal mesodermal tissue)