In the initiation of the vertebrate eyes, paired regions of the brain bulges (optic vesicles, act as inducer) out and approach the surface ectoderm (act as responder) of the head.

TLS Online TPP Program

#Id: 9523

#Unit 6. System Physiology – Plant

Three major types of insect herbivores

Phloem feeders, such as aphids and whiteflies, cause little damage to the epidermis and mesophyll cells. Phloem feeders insert their narrow stylet, which is an elongated mouthpart, into the phloem sieve tubes of leaves and stems. 

TLS Online TPP Program

#Id: 8638

#Unit 2. Cellular Organization

Once sufficient Cln3 is synthesized from its mRNA, Cln3-CDK complexes phosphorylate and inactivate the transcriptional repressor Whi5.

TLS Online TPP Program

#Id: 1474

#Unit 4. Cell Communication and Cell Signaling

All integrins bind to proteins that consist of tripeptide sequence Arg-Gly-Asp, called the RGD motif

TLS Online TPP Program

#Id: 10185

#Unit 6. System Physiology – Plant

Ratio of GA:ABA affects early germination (vivipary). 

With high levels of ABA, seeds remain dormant.

TLS Online TPP Program

#Id: 952

#Unit 5. Developmental Biology

In sea urchins, the acrosome reaction is initiated by sulfate-containing polysaccharides in the egg jelly.