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Q1. The neurotransmitter acetylcholine is made in the cytosol and then transferred into synaptic vesicles, where its concentration is more than 100 fold higher than in the cytosol. Synaptic vesicles isolated from neurons can take up additional acetylcholine if it is added to solution in which they are suspended but only in the presence of ATP. Na+ ions are not required for acetylcholine uptake, but raising the pH of the solution in which the synaptic vesicles are suspended increases acetylcholine uptake. In addition, transport is inhibited consistent with all these observations. Propose a mechanism that is consistent with all these observations.
Q2. In winter, plants exchange the saturated lipids in their membranes for unsaturated lipids. Unsaturated lipids are "bent" and keep the membranes more fluid since they cannot be stacked closely together. Of what benefit would this be for herbaceous plants that live through the winter?
An electric field with a magnitude of 170 N/C exists at a spot that is 0.11 m away from a charge. At a place that is 0.36 m away from this charge, what is electric field strength.
Ralph is taking scuba diving classes, and is warned not to hold his breath as ascending from depth but to continuously release air from his mouth. What is the basis of this instruction and what is risk if it is ignored.
What caused the symptoms? What treatment has to have been administered in July? What treatment must be administered 2 years later.
In enzyme lab. Manganese Dioxide does not come from a living thing. Is it a catalyst (define catalyst)? Is it an enzyme? Describe. Why did we test the hydrogen peroxide with manganese dioxide.
Show the lines of current flow to unexcited parts of the cable. Elucidate how these local currents cause the action potential to propagate. A common mistake is to confuse the currents that flow throughout the action potential the voltage-clamp curren..
What effect do you think EBV would have on B cell function. What phenotypes would you expect in the F2, and in what actual numbers (not ratios) will you expect to find out them.
In our population there are 300 red sea stars, 200 pink sea stars and 500 White Sea stars. How numerous total alleles for sea star colour are in this population.
What are the most probable genotypes of the male and female parents? Give details the strategy used to determine the genotypes. What is the probability of the subsequently offspring having a spotted brown tail.
Explain how tail length is inherited. Indicate how many gene pairs are at work and designate the genotypes of the two parents and lf the F1 offspring.
How to comprise the genotypes of both parents. The pronghorn of the United States and the saiga antelope of the central Asian steppes live in similar habitats and have alike adaptations. Which of the features would you be surprised to discover in a s..
If a double heterozygous plant were crossed with a plant that has green stems and red fruit, what offspring phenotypes would be expected and in what proportions.
Describe oxidative and non-oxidative branches of the pentose phosphate pathway and distinguish between these branches in terms of their roles in producing NADPH for biosynthesis reactions or 5-carbon sugar for mucleic acid synthesis.
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