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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.
What is the 'carrier' which picks up the hydrogen stripped from the pyruvates in the Krebs cycle? What is the original source of these H's? What is their ultimate destination? Give two other names for the Krebs Cycle.
An investigation of the distribution of species of a small invertebrate between a dry area and a humid area in a choicechamber was done. After 6 minutes, it was observed that most of thespecies moved towards the humid area.
If there was mutation in a dna triplet that changed the first triplet from ctt to ctc, would that cause the problem with the resulting polypeptide.
Which of the following best characterizes membrane structure.
What effect would the following mutations have on the expression of the enzyme coding sequences of the tryptophan operon. Select the letter on the right that describes the effect.
Describe in detail the influences and effects that the different phases of rigor mortis (delay, onset,completion, and resolution) have upon the subsequent properties (water binding, color, juiciness, tenderness/texture, flavor) of meat
How can we use what we know about this process to construct a timeline showing when various sequence changes occurred and when they lead to the modern sequences that we know today?
What are the three major classes of molecules that function as hormones? Which are water-souble and which are lipid-souble.
What is the function of a DNA binding protein and the operator andhow do these regulate an operon (the operon is repressible)?
A friend claims that the faster you read, more you remember. Use your information of effortful processing and effective encoding strategies to refute your friend's claim.
A Texas genetics compant recently issues a press release claiming to have sequenced the genome of Bigfoot. Supposedly, the mitochondrial DNA sequence is identical to that of modern Homosapies.
Bacterial resistance to many antibiotics has become a problem in the medical field making infections hard to treat. What type of natural selection does this represent?
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