Transcription. Transcription is the name given to the process where the information in a gene in a DNA strand is transferred to an RNA molecule. The coding strand and the template strand of DNA. The important thing to realise is that the genetic information is carried on only one of the two strands of the DNA. This is known as the coding strand.
1 Sugar diffuses from the mesophyll in the leaf to the phloem cells in the vascular bundles. 2  Specialized cells called companion cells load the dissolved sugar into the sugar-conducting cells (called sieve elements) of the phloem by using cellular ATP as an energy source. - collections of similar cells that serve a specific purpose by functioning together. 2  Unlike animals, the major organs of plants (roots, stems, and leaves) are all composed of the same three tissues (epidermis, vascular tissues, and ground tissues).
Sugars like lactose are âbackupâ carbohydrates. This means that the cell only metabolizes lactose if glucose is low and lactose is plentiful. The cell uses a negative control system (the lac operon) to respond to the availability of lactose in the environment.Negative control. means that itâs a system in which the active substance acts to turn off function.perons. Control of Gene Activity in Prokaryotic Cells. The activity of genes is controlled by the cell and the environment. Inducible. genes are inactive unless circumstances cause them to be activated (âturned onâ). Repressible. genes are active unless circumstances cause them to be inactivated (âturned offâ).