Classwork-BIO13 10.001 × Take Test: Class Quiz (9/1 × CO Course Home C Secure |

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Classwork-BIO13 10.001 × Take Test: Class Quiz (9/1 × CO Course Home C Secure | https://morgan.blackboard.com/webapps/assessment/take/lar Question Completion Status: QUESTION 4 Identify the strategies cells use to overcome the following: Limitations of membrane transport capacity Limited diffusion of large molecules and complexes within the cytoplasm Accommodating a large amount of genetic information Low concentrations of reactants Structural support: Plants cells Animal cells TTT Arial T·-·-·- ' 3(12pt) Path: p

Explanation / Answer

Answer. Gentic information present on the DNA which made up of deoxyribose sugar, phosphate and 4 bases A,T,C and G. It is too long to fit into the cells. to overcome this limitation cells has histone protein. DNA is wrapped around histone pritein and form a bead on string structure so that it is compactly packed DNA inside the nucleus. In this manner cells accomodate large amount of genetic information.

Cells contain the phospholipid bilayer made up of lipid and protein which limit the diffusion of molecule across the cells. To overcome this limitation cells have transmembrane protein on the surface which allow the diffusion of large molecule and complexes and also the active transport mechanism so that required molecule can able to enter into cells.

To overcome the limitation of concentration of reactants by metabolic pathways that turned on or off according to requirement of the molecule also the passive or active diffusion mechanism that maintained concentration of feactants inside and outside of the cells.

To overcome the limitation of membrane transport capacity, Cells have both active and passive transport mechanism. Passive transport involve simple and facilitated diffusion down the concentration gradient and active transport involves against the concentration gradient . So, required moecule flow in and out of the cells.

Plant cells has rigid cell wall that provide the cell structural support. In animal cells, cytoskeleton provide mechanical and structural support to cells.

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