Because it determines if it is isolated or not. This means if other substances can enter or not. This usually relies on the membrane with it´s pores. The pores help the membrane be selectively permeable in what it lets in and out.
From your genetics lab, Agrobacterium tumefaciens gram-positive bacterium was used during your experiment on genetic manipulation of a corn plant
Rhizobiaceae is a family of bacteria that includes Agrobacterium tumefaciens. Gram-negative and aerobically growing, these bacteria don't produce endospores. The cells have one to six peritrichous flagella and are rod-shaped and motile. Cells can exist alone or in pairs and range in size from 0.6 to 1.0 m by 1.5 to 3.0 m.
Agrobacterium tumefaciens is a gram-negative bacterium that causes tumors in plants through horizontal gene transfer. In a variety of plant species, Agrobacterium tumefaciens has been widely exploited as the primary agent in the generation of transgenic plants. A soil phytopathogen called Agrobacterium tumefaciens naturally infects plant wound sites and causes the disease known as crown gall by the transfer of (T)-DNA.
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A team of students is performing an experiment to determine how the speed of a reaction between HCl and Na2CO3 changes with temperature. The aspect of the experiment that does not have to be kept constant would be the initial concentrations of the reactants. Hope this helps. Have a nice day.
Carbohydrates - glucose
Lipids - fatty acids.
protein - figure 4
Nucleic acid - figure 3
Passive Transport: Simple Diffusion
Diffusion across a cell membrane is a type of passive transport, or transport across the cell membrane that does not require energy. Remember that the cell membrane is a phospholipid bilayer. Although the inside and the outside of a cell are both water-based, there is a hydrophobic region in the middle, and this is an important barrier to anything large, charged, or hydrophilic. Molecules that are hydrophobic, just like the hydrophobic region, can pass through the cell membrane by simple diffusion.
Therefore, simple diffusion is the unassisted passage of small, hydrophobic, nonpolar molecules from a higher concentration to a lower concentration. Very small molecules can slip through the cell membrane, too, even if they are hydrophilic - just like a few ants might crawl through a crack in the wall just because they're tiny.
