Lambda Repressor. The repressor molecule of the Lambda bacteriophage binds not only to the OR1 site to prevent Cro transcription, but also to OR2, where it aids the binding of RNA polymerase to the repressor promoter. In fact a repressor dimer bound to OR1 interacts cooperatively with a second dimer binding to OR2.
Mandevillas grow as tropical perennials in frost-free regions. When looking for an attractive, blooming tropical vine, don't overlook mandevillas (Mandevilla spp.). These lovely climbing vines have abundant and showy blossoms that are produced for a period of several months.n these areas, mandevilla vines can reach a height of 10 to 20 feet, with older stems becoming woody and thick. In parts of zone 8 where winter frosts might occur, mandevillas planted outdoors often die back to the ground but regrow from surviving roots the next spring.
1 âAbbotswoodâ is a very popular cultivar with single white flowers and bluish green leaves. â 2 Sunsetâ has orange flowers that fade to yellow in the heat of summer. â 3 UManâ features bicolored red and orange flowers. â 4 Primrose Beautyâ blooms in a soft shade of yellow and has silvery leaves.otentilla Plant Care. Potentilla needs full sun or light shade. A little shade during the heat of the day keeps the plant blooming longer. It prefers moist, fertile, well-drained soil, but tolerates, clay, rocky, alkaline, dry or poor soils. Strong disease and insect resistance makes growing Potentilla easy.