bromodeoxyuridine (BrdU) is rapidly phosphorylated and incorporated in its place into newly synthesized DNA hence BrdU is used to detect replicating cells

TLS Online TPP Program

#Id: 1138

#Unit 2. Cellular Organization

Inhibitory Proteins in Cell Cycle-

Sic1 - Binds and inhibits S phase CDKs

CKIs p27, p57, and p21- Bind and inhibit CDKs

INK4 - Binds and inhibits G1 CDKs

Rb - Binds E2Fs

TLS Online TPP Program

#Id: 7183

#Unit 5. Developmental Biology

Chordin is the one most acutely activated by β-catenin. Like Noggin, Chordin binds directly to BMP4 and BMP2 and prevents their complexing with their receptor

TLS Online TPP Program

#Id: 5470

#Unit 7. System Physiology – Animal

Synaptic delay is due to the time it takes for the synaptic mediator to be released and to act on the receptors on the membrane of the postsynaptic cell. 

The minimum time for synaptic delay is 0.5 ms

TLS Online TPP Program

#Id: 5484

#Unit 7. System Physiology – Animal

Approximately 50% of the choline is returned to the presynaptic terminal by Na+-choline cotransport

TLS Online TPP Program

#Id: 606

#Unit 2. Cellular Organization

N binds to RNA transcribed from DNA containing a nut sequence. Thus, once RNA polymerase has passed a nut site, N binds to the RNA and from there is loaded on to the polymerase itself. In this state, the polymerase is resistant to the terminators found just beyond the N and cro genes.