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: 5028

#Unit 3. Fundamental Processes

The replication cycle can be defined in terms of two constants: C and D

C is the fixed time of 40 minutes required to replicate the entire E.coli chromosome. Its duration corresponds to a rate of replication fork movement of 50,000 bp/minute.

D is the fixed time of 20 minutes that elapses between the completion of a round of replication and the cell division with which it is connected. This period may represent the time required to assemblethe components needed for division.

TLS Online TPP Program

#Id: 7688

#Unit 1. Molecules and their Interaction Relevant to Biology

                                                       Zinc Finger Motif

Zinc atom stabilizes the structure/fold by coordination bonds

Each motif contains about 30-50 amino acids

Contains regular patterns of Cys / His, which coordinate with Zinc atom

Contains one helix and two small anti-parallel beta sheets in each finger

Zinc holds helix and beta-sheets together

Helix binds to DNA

TLS Online TPP Program

#Id: 7584

#Unit 5. Developmental Biology

Calcium and bicarbonate ions are critical in activating cAMP production and in facilitating the membrane fusion events of the acrosome reaction

TLS Online TPP Program

#Id: 2855

#Unit 13. Methods in Biology

The presence of several conjugated double bonds in organic molecules possess  p ®p* transitions in the UV/Vis range of the electromagnetic spectrum. Such molecules are very useful tools in colorimetric applications.

TLS Online TPP Program

#Id: 1402

#Unit 4. Cell Communication and Cell Signaling

Myosin II

Two heads and assembles into bipolar filaments

Small and non-processive

Function- Contraction