Discuss the control of transcription in prokaryotic cells Assignment

Discuss the control of transcription in prokaryotic cells - Assignment Example They possess flagella which accounts for the motility of some prokaryotes. These organisms do not contain intracellular membrane bound organelles such as mitochondria and lysosmes. The size of their ribosomes is 70S which is small as compared to that of eukaryotic cells. The most important and distinguishing feature of prokaryotes is regarding their genetic material. They possess both DNA and RNA but their DNA is single stranded. Their genetic material does not lie in a nucleus rather in a nucleoid which does not have a nuclear membrane and consists of DNA which is in a circular form and is loose. The DNA of the prokaryotes is double stranded. This DNA is also not folded and arranged around histones. The prokaryotes do not contain sterols except for one exception which is Mycoplasma Bacterium which contains them. Prokaryotes are organisms which can survive in extreme conditions as for example at temperatures ranging as high as 80 degrees centigrade. The formation of RNA from DNA is termed as transcription. This process is very essential because it is this RNA which then codes for amino acids and hence proteins. The process of transcription is accomplished by an enzyme known as RNA polymerase. The strand of the DNA that is transcribed is in the 3’ to 5’ direction. Hence the transcript that is formed in the opposite direction that is 5’ to 3’ direction. This is because the RNA polymerase functions in the 3’ to 5’ direction on the DNA creating a complementary strand on RNA in which the Adenine always pairs with Uracil whereas the guanine always pairs with the the cytosine. Prokaryotic cells contain only one type of RNA polymerase. This RNA polymerase only is responsible for the formation of all the different types of RNA in the prokaryotes which includes the mRNA, rRNA and tRNA. RNA polymerase has a distinguishing quality that it can initiate the process of

Urban issues assignment Essay Example | Topics and Well Written Essays - 2500 words

Urban issues assignment - Essay Example Taking USA and Germany as case studies, the paper seeks to come up with the best possible solutions to these challenges for a sustainable future. Germany and The USA are among the highest motorized countries around the world. Between 2010 and 2014, there were 588 and 786 motor vehicles per 1000 people in Germany and the IUS respectively (National Transportation Statistics). Motorization has in turn increased the demand for parking areas, resulting in problems in consumption of space mainly in central areas. The connection between congestion and parking is also evident where motorists experience delays looking for parking areas, negatively affecting local flow. In both of these countries, there is a high density of population and due to the fact that many households are close to means of public transport, there are a small number of trips made by personal cars owing to the convenience of public transport. There are, however, differences that are still evident. Most Americans depend more on cars as compared to their German counterparts (786 against 588 per 10000 people) as more Germans prefer walking or cycling as well as us of public transport. This over-reliance on motor vehicles by Americans has led to heavy consumption of energy and ultimately resulting in pollution, rendering the current maintenance cost of urban spaces unsustainable (Wellman 336). The American transport system grapples with high number of trips per capita, estimated to be about three times higher as compared to Germany. Americans also spend about 5% of their budget on transport, a crucial amount compared to other countries that pay between 2 and 3% (National Transportation Statistics). For this reason, there has been need to adopt policies that would assist in reducing the over-reliance on automobiles and ultimately aid in reduction of congestion in major areas. For example, one of the most densely populated states,