Facebook Write an essay on two double membrane bounded organelles and their functions: Homework help for grade 5 Tweet Your week sounds like mine! The global market environment essay, rk mechanical essay future of youth essay language word count comparison essay birmingham university masters application essays two paragraph essay on erosion. David almond skellig analysis essay two paragraph essay on erosion a short love story essays someone who you admire essay edit my college essay essay entertainment schriften abenjacan el bojari analysis essay elderly neglect essay report writing themes for dissertation.
December 8, NASA: Life with arsenic December 7, Last week, in a much publicized news conference, NASA announced the discovery of a bacterium that can use arsenic instead of phosphorus. The news media covered it with a flourish -- and produced much nonsense. The paper was posted at the Science magazine web site, so we can look at what was really shown.
Whatever the hype that the news media added, it is an interesting -- but incomplete -- story. The figure at left shows a key experiment; this is Figure 1B of the paper.
The graph shows the growth of the bacteria under different conditions. Number of cells on the y-axis log scale ; time on the x-axis. The three conditions are, from the top: Importantly, if there is no addition, the bacteria grow very little, if at all lower curve.
Then, arsenic in the form of arsenate does indeed stimulate growth middle curve. So does phosphate; in fact, it is better upper curve.
The above experiment along with other measurements does seem to establish the basic point: But now let's look at some of the limitations of the story -- as we have it so far. First, the bug prefers P to As: You can see this in the graph above. They explicitly do not claim that the bug requires or prefers As, merely that it can use it.
Second and more importantly, the growth medium with no added P contains a trace level of P.
This probably comes from low levels of P contaminating other chemicals they use. It's not enough to support growth alone lower curve in the graphbut it does mean that when the bugs are growing on As, they also have a small amount of P available.
In fact, analysis of the bacteria grown on As shows a weight ratio of about 7 As: On a mole basis, the ratio would be about half that. Thus there still is considerable P in the bacteria. They cannot claim a total replacement of As for P. The paper recognizes this limitation, but some of the news coverage does not.
This may be interesting, too. So, where is the As in the cell? This becomes particularly important since the replacement is incomplete. And this is where the paper gets rather weak. They hand-wave that it is everywhere, but there is little specific information.
Where did this bacterium come from? It was isolated from Mono Lake -- a highly alkaline lake in the Sierras of eastern Californiawith a high As level.Home / Write an essay on two double membrane bounded organelles and functions / Write an essay on two double membrane bounded organelles and functions.
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Functions of Various Organelles Of The Plant Cell Let us begin with taking each internal organelle found in the plant cell diagram and highlighting its function and purpose within the plant cell.
The most important things to note are the differences that make a plant cell so different from an animal cell. 1. INTRODUCTION - OVERVIEW - Biology as a science deals with the origin, history, process, and physical characteristics, of plants and animals: it includes botany, and zoology.
A study of biology includes the study of the chemical basis of living organisms, urbanagricultureinitiative.com related sciences include microbiology and organic chemistry. Structures and Functions of Cell Organelles The main feature of an animal cell is the nucleus enclosed by a nuclear envelope which is a double membrane system.
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