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A cell membrane can be modeled as a thin, impermeable layer of thickness L, pierced by tiny holes of radius, r. The combined area of all of the holes amounts to a fraction, a of the total membrane area. Assume that.
Some small dissolved solute is held at a uniform concentration ceverywhere on one side of the membrane; initially, the other side has onlypure water.
The solute molecules are much smaller than r.a) Find the resulting initial flux of solute molecules across the membrane.b) Suppose that a =0.1%, c=0.1M, L=4 nm and r=1 nm. What is theflux?
Evaluate your answer in molecules per square micrometer persecond.
the earths largest phylum is arthropoda including centipedes millipedes crustaceans and insects. the insects have shown
Salmonella typhimurium in poultry, Clostridiumperfringens in precooked meat, and Vibrioparahemolyticus in seafood shellfish are serious food safetyconcerns.
1. one condition that seems to lead to senescence and not apoptosis in stem cells isa. shortening of telomeres below a
What was the case number of the student's karyotype? What was the result of the student's karyotype? (Include the sex andthe chromosomal disorder, if applicable. If there was no chromosomaldisorder, the student must state that the individual was n..
q1. in animal cells and in the meristem cells of land plants the nuclear envelope disintegrates during mitosis. this
sketch the chromosomes of the parents and the F1. analyse interference and say what you think of its significance.
Red-green color blindness in humans is inherited as an X-linked recessive condition. Consider reciprocal crosses between a color-blind parent.
Some evolutionary biologists have argued that the neutral theory should be taken as the null hypothesis to explain genetic variation within species or populations and genetic differences among them.
q1. eastern tent caterpillars malacosoma americanum live in large groups in silk nests or tents which they build in
q1. conservationists will take snow geese off endangered species list while the population hits 10000. if populations
Selected species Genus and species Time frame and geographic area
Data suggest that rubisco (ribulose-1,5-bisphosphate carboxylase) makes up 10% of the total protein found in spinach leaves. Research elucidating the structure of rubisco shows that it has four active sites. Why, with four active sites, might ther..
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