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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?
In cats, coat color is an X-linked trait where a black coat is determined by the XB allele and a yellow coat by the Xb allele. Black and yellow are co-dominant and a heterozygote has a tortoiseshell coat.
Can you measure the residual volume and total lung volume by spirometry? Explain. Also explain how the residual volume, vital capacity, and total lung capacity change with age.
What happens to the average speeds of the particles in a gas when one increases that gas's temperature?
A marine biologist has dredged up an unknown animal from the seafloor. Describe some of the characteristics she must look at to determine the phylum to which the animal have to be assigned.
Which of the following statements correctly and most accurately describes the function of FAD in the pyruvate dehydrogenase enzyme complex?
In a nondividing cell such as a liver cell, why must the flow of membrane between compartments be balanced, so that the retrieval pathways match the outward flow? Would you expect the same balanced flow in a gut epithelial cell, which is actively ..
Which is NOT a density-dependent, growth-limiting factor?
Phosphorous is needed to synthesize the deoxyribonucleoside thriphosphates used in DNA replication. A geneticist grows some E. coli in a medium containing nonradioactive phosphorous for many generations.
The two largest marine predators are killer whales and big sharks such as great whites. Suppose that a killer whale and a great white shark of the same size and weight are capable of swimming at the same maximum velocity
Compare and contrast the atmospheres of Jovian planets and the atmospheres of terrestrial planets. Why are the components of Jovian atmospheres so different from those of terrestrial planets?
Imagine a population of 12,000 people: 7,000 females and 5,000 males. Syndrome A is an Xlinked recessive disorder. The population contains 134 affected females, 1682 carrier females and 710 affected males.
Discuss the process of natural selection as defined by Darwin. How did Darwin's theories differ from his predecessors?
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