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explain briefly four factors that the diffusion of substances
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Asked 4/27/2012 1:39:37 PM
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User: explain briefly four factors that the diffusion of substances

Weegy: the rate of diffusion is directly proportional to the concentration gradient. The greater the difference in concentration between two areas, the greater the rate of diffusion. [ Thus, when the gradient is zero, there will be no net diffusion, diffusion will only occur so long as a concentration gradient exists; the rate of diffusion is indirectly proportional to resistance. In other words, the greater the resistance to diffusion, the lower the rate of diffusion. Resistance refers to anything that reduces the rate of diffusion such as the partition in our perfume example. The width of the partitions is a resistance; the wider the partitions, the lower the resistance. And, the membrane is a resistance to the movement of ions and other charged substances in or out of cells; and the rate of diffusion is inversely proportional to distance traveled (also a function of resistance). For example, some typical diffusion rates for water are 10 ?m - 0.1 sec; 100 ?m -1 sec; and 1 mm - 100 sec. As the text demonstrates nicely, diffusion is effective over short distances, but is pathetically slow over long distances. The rate of diffusion is directly proportional to temperature; and The rate of diffusion is indirectly related to molecular weight (heavier particles move more slowly than lighter, smaller ones). At room temperature, the average velocity of a molecule is fast - about 2 km/sec (=3997 mph!). Temperature increases the rate of molecular movement, therefore, increases the rate of diffusion. Pressure increases the speed of molecules, therefore, increase the rate of diffusion. Solute particles decrease the free energy of a solvent. Essentially solvent molecules, such as water in a biological system, move from a region of greater mole fraction to a region where it has a lower mole fraction. Source(s): ]
Controler|Points 1383|

User: what is gene

Weegy: A gene is a molecular unit of heredity of a living organism. It is a name given to some stretches of DNA and RNA that code for a type of protein or for an RNA chain that has a function in the organism. Living beings depend on genes, as they specify all proteins and functional RNA chains. Genes hold the information to build and maintain an organism's cells and pass genetic traits to offspring, although some organelles (e.g. mitochondria) are self-replicating and are not coded for by the organism's DNA. All organisms have many genes corresponding to various different biological traits, some of which are immediately visible, such as eye color or number of limbs, and some of which are not, such as blood type or increased risk for specific diseases, or the thousands of basic biochemical processes that comprise life.


User: diffrentiate between genotype and phenotype

Weegy: A genotype describes the actual set (complement) of genes carried by an organism. [ [ In contrast, phenotype refers to the observable expression of characters and traits coded for by those genes. Although phenotypes are based upon the content of the underlying genes comprising the genotype, the expression of those genes in observable traits (phenotypic expression) is also, to varying degrees, influenced by environmental factors. ]
Expert answered|migzptz|Points 5833|

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