Many prokaryotic ORFs contain a short sequence upstream (on the 5’side) of the start codon called the ribosome binding site (RBS). This element is also referred to as a Shine –Dalgarno sequence.

TLS Online TPP Program

#Id: 7364

#Unit 5. Developmental Biology

In the absence of Cerberus, Nodal is not activated and thus Pitx2 is not expressed

TLS Online TPP Program

#Id: 5709

#Unit 7. System Physiology – Animal

FSH & LH

control growth of the ovaries and testes.

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: 7524

#Unit 6. System Physiology – Plant

Auxin-induced proton extrusion acidifies the cell wall and increases cell extension Auxin increase the rate of proton extrusion (wall acidification), and the kinetics of proton extrusion should closely match those of auxin-induced growth.

TLS Online TPP Program

#Id: 8098

#Unit 1. Molecules and their Interaction Relevant to Biology

The surfaces of the cells that form the alveoli (small air spaces of the lung) are coated with surfactant, which decreases the alveolar surface tension. 

Lung surfactant contains 80 to 90% phospholipid by weight, and 70 to 80% of the phospholipid is phosphatidylcholine, mostly the dipalmitoyl species.