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1. Which of the following is true of the evolution of cell membranes?A) Cell membranes cannot evolve if proteins do not.B) The evolution of cell membranes is driven by the evolution of glycoproteins and glycolipids.C) An individual organism selects its preferred type of cell membrane for particular functions.D) As populations of organisms evolve, different properties of their cell membranes are selected for or against.E) Cell membranes have stopped evolving now that they are fluid mosaics.
2. Of the following functions, which is most important for the glycoproteins and glycolipids of animal cell membranes?A) facilitated diffusion of molecules down their concentration gradientsB) a cell's ability to distinguish one type of neighboring cell from anotherC) maintaining membrane fluidity at low temperaturesD) active transport of molecules against their concentration gradientsE) maintaining the integrity of a fluid mosaic membrane3. Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?
A) CO2B) an amino acidC) K+D) starchE) glucose
Why is it that gazelles are more likely to stot in response to coursing predators than to stalking predators (african wild dogs vs cheeahs)? I thought it would make sense that it would be profitable to stot in reponse to a stalking predator.
Was the physician correct in saying that bacteria can share resistance and if the infant was given an antibiotic as a precaution, how might it contribute to the production of resistant bacteria?
In a random mating population, we have identified leghorn chickens that have an autosomal recessive disorder that results in the hopping like a bunny.
Compute the changes in Na+ due to an action potential. In other words, by what factor does the [Na+]I change because of an action potential firing?
Monkeys infected with "Devil Pox" survive depending on their genotype at a single locus. AA individuals survive 50% of the time. AB individuals survive 75% of the time.
Brown color in mice is dominant over albinism. In a given cross between a brown and albino, six brown and five albino offspring are produced. What was the genotype of the original brown parent?
q1. seedless watermelons are actually a product of mistakes in meiosis these seedless watermelon are triploid 3n and
Based on your knowledge of the role of renal tubule in regulating ion balance, explain how a diuretic could induce hyperkalemia. Then explain how a different diuretic might induce hypokalemia.
Assume you wish to increase fruit diameter in tomatoes, and you want to estimate heritability for this trait. You measured the diameter of tomatoes in two inbred lines.
Organisms on the planet Uglantis, that orbits distant star, have metabolism remarkably similar to that in organisms on Earth with a few exceptions.
Are the cells observed in your blood smear different that the bacterial cells found on yogurt slides? Why or why not?
In an experimental situation, a student researcher inserts an mRNA molecule into the cytoplasm of a eukaryotic cell after she has removed its 5' cap and poly-A tail.
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