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Why did the "RNA World" hypothesis have to await the discovery of ribozymes in order to become a widely attractive scenario?
Describe the steps of the nitrogen cycle. How is nitrogen lost from ecosystems? How is it replaced? Why does it need to be "fixed?"
It is determined that the human immune system synthesizes 10 8 – 10 10 antibodies. The portion of a typical active in binding antigen consists of two variable domains each containing one hundred amino acids.
On an autosome, genes A and B are twenty map units apart. An AABB male mates with an aabb female. What % of the gametes produced by their hybrid offspring will be Ab?
If you were to carry out temperature experiments at a higher or lower [S], what effect would [S] have on the temperature optimum for amylase? Explain.
The parental cross in Drosophila is a mutant male fly (b/b . B/B) with a virgin wild-type female (+/+ . +/+) What are the expected phenotypic ratios for each sex AND the overall population of the F2 generation? There may not be 4 phenotypes for ea..
The parents of the neonate described above ask you about the risks for similar birth defects in their future offspring. You mention that supplementation of the martenal diet can reduce the incidence of neural tube defects. What is this important d..
If oxygen is unavailable, what happens to the citric acid cycle and if necessary, during which stage(s) of cellular respiration is(are) carbon dioxide released?
Earthworms are aerobic organisms that require oxygen to carry out cellular respiration in order to make ATP. They absorb oxygen from the surrounding soil across their moist skin, which means that the rate of oxygen absorption depends on their surf..
Discuss the two main classes of T cells and explain how are they distinguished from each other. What are their most important functions.
In Tomatoes, the allele for red fruit is dominant over the allele for yellow fruit. The allele for tall plants is dominant over the allele for short plants.
Assume if a man of blood group AB marries a woman of blood group A whose father was of blood group O, to what different blood groups can this man and woman expect their children to belong?
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.
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