In some cases, the various heterochromatic regions, especially those associated with centromeres, aggregate into a densely staining chromocenter.

The common form of heterochromatin that always remains heterochromatic is called constitutive heterochromatin. 

It is permanently condensed. 

It replicates late in S phase and has a reduced frequency of genetic recombination relative to euchromatic gene rich areas of the genome.

TLS Online TPP Program

#Id: 10241

#Unit 6. System Physiology – Plant

ABA is synthesized in almost all cells that contain chloroplasts

or amyloplasts and has been detected in every major organ and tissue. ABA is a 15-carbon terpenoid, or sesquiterpenoid, which is synthesized in plants by an indirect pathway via 40-carbon carotenoid intermediates

TLS Online TPP Program

#Id: 7911

#Unit 2. Cellular Organization

MCSs also serve as interfaces for the transfer of ions (Ca+2 ) and small molecules (glycerophospholipids) between the ER and mitochondria.

TLS Online TPP Program

#Id: 1333

#Unit 4. Cell Communication and Cell Signaling

Cholera toxin, secreted by Vibrio cholerae Catalyze a covalent modification of the Gαs protein Inhibit GAP activity.

TLS Online TPP Program

#Id: 1075

#Unit 5. Developmental Biology

Class C activity alone specifies carpels.

TLS Online TPP Program

#Id: 10515

#Unit 4. Cell Communication and Cell Signaling

XIAP has N-terminal BIR domains: 

BIR2 - binds to and inhibits caspase-3 and caspase-7

BIR3 - binds to and inhibits initiator caspase-9