The metaphase scaffold consists of a dense network of fibers. Threads of DNA emanate from the scaffold, apparently as loops of average length 30 to 90 kb.

#Id: 2458

#Unit 13. Methods in Biology

When the potential gradient E is applied, the force F on a molecule bearing a charge of Q  sepreated  by distance d (measured in coulombs) is                  (in newton). 

#Id: 7405

#Unit 5. Developmental Biology

#Id: 7372

#Unit 5. Developmental Biology

Major genes affecting segmentation pattern 

1.Gap genes                 2. Pair rule genes(primary)           3. Segment polarity genes      

Kruppel (Kr)                    hairy(h)                                             engrailed (en)

knirps (kni)                      even skipped(eve)                           wingless (wg)

hunchback (hb)              runt(run)                                           cubitus interruptus(ci) 

giant (gt)                          Pair rule genes (secondary)           hedgehog(hh)

tailless (til)                       fushi tarazu (ftz)                              fused (fu)

huckebein (hkb)              odd paired (opa)                             armadillo (arm)

buttonhead (btd)            odd skipped (odd)                          patched (ptc)

empty spiracles (ems)    sloppy paired (slp)                          gooseberry (gsb)

orthodenticle (otd)         paired (prd)                                      pangolin (pan

#Id: 1196

#Unit 7. System Physiology – Animal

FSH and LH stimulate sex hormone synthesis by the activation of the cyclic adenosine monophosphate second messenger system.

#Id: 955

#Unit 5. Developmental Biology

Extension of the acrosomal process by the polymerization of G-actin molecules into F-actin by RhoB