The conversion of cholesterol to pregnenolone, catalyzed by cholesterol desmolase, in mitochondria.

TLS Online TPP Program

#Id: 8271

#Unit 1. Molecules and their Interaction Relevant to Biology

Misplaced Dispersion forces are responsible for

1. Sickle-Cell Anemia

2. Alzheimer's disease

3. CFTR

4. Huntington disease

TLS Online TPP Program

#Id: 3223

#Unit 4. Cell Communication and Cell Signaling

Indirect-acting carcinogens

Relatively unreactive compounds that become modified to more reactive forms by cellular cytochrome P-450 enzymes

TLS Online TPP Program

#Id: 7114

#Unit 6. System Physiology – Plant

In the absence of ethylene, ETR1 and the other ethylene receptors activate the kinase activity of CTR1. This leads to a repression of the ethylene response pathway, possibly through a MAP kinase cascade. 

The binding of ethylene to the ETR1 dimer results in its inactivation, which causes CTR1 to become inactive.

TLS Online TPP Program

#Id: 176

#Unit 5. Developmental Biology

Instructive interaction

It occur where the responding cell has a choice of fates and will follow one developmental pathway following induction and an alternative pathway in absence of the inductive signal. 

TLS Online TPP Program

#Id: 4021

#Unit 2. Cellular Organization

Active genes are often found at the borders of chromosome territories, and active genes from several chromosomes may cluster in inter-chromosomal territories that are enriched in transcription machinery.