Deletions are lethal in the homozygous state because all copies of any essential genes located in the deleted region are missing.

TLS Online TPP Program

#Id: 9074

#Unit 4. Cell Communication and Cell Signaling

Activation of β-adrenergic receptors causes activation of C subunits of PKA which phosphorylate PDE, stimulating its catalytic activity.

TLS Online TPP Program

#Id: 10293

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 10370

#Unit 4. Cell Communication and Cell Signaling

HLA-G

These are present on fetal cells at the maternal-fetal interface and are credited with inhibiting rejection by maternal CD8+ T cells by protecting the fetus from identification as foreign.

TLS Online TPP Program

#Id: 708

#Unit 3. Fundamental Processes

seqA is part of a negative regulatory circuit that prevents origins from being remethylated.

TLS Online TPP Program

#Id: 4318

#Unit 11. Evolution and Behavior

Aristotle proposed that life arose from nonliving material if the material contained pneuma (“vital heat”).