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4-Propylaminobenzoic acid (PABA) is a strong inhibitor of methanopterin, a key cofactor in the methanogenesis enzymes. From what you have learned about the cow rumen ecology, can you explain why it made cows sick after it was fed to cows? What are your thought about the attempts to reduce methane production from the cattle by feeding the cow with chemical inhibitors of methanogenesis? Please explain the roles of microorganisms in the rumen ecosystem.
A friend of yours is wearing a bright red shirt. In terms of properties of light and pigments, describe why the shirt appears red to you.
NMR spectroscopists often do experiments in D2O. The deuterium atoms in D2O can exchange for hydrogens in an organic molecule if and only if those hydrogens are exposed to solvent and are attached to polar atoms.
define which phase of the cell growth or division. In a normal diploid cell, polyploidy can be induced by treatment with colchicine.
A patient in your care has a total body water volume of 42 Liters, a hematocrit of 40 percent an extra celllular fluid volume of thirteen liters and a plasma osmolarity of 300 mOsm/ liter.
Traditionally, it was thought that nucleus was the control center of the cell. Recent discoveries though, indicate that the nucleus in eukaryotes is merely a repository of genetic data.
In a hypothetical population of sawflies, 20 percent of the population ishomozygous for allele A and 45 percent is homozygous for allele.
In mice, dwarfism is caused by an X-linked recessive allele, and pink coat is caused by an autosomal dominant allele. If a dwarf female from a pure line is crossed with a pink male from a pure line, Determine the phenotypic ratios in the F1 and F2 in..
Show your work. State the phenotypes of the two parents of the original wild-type fly.
List the two kinds of macromolecules that have been partially digested by the time acid chim moves into the intestine. Where did this digestion take place, and what enzymes are involved.
Describe how the evolution of roots and simple vascular transport expanded the habitat of plants onto land.
According to your understanding of the nitrate reductase and nitrite reductase tests, why would the inclusion of nitrite inhibit anaerobic growth?
Kangaroo rats native to North American deserts have very efficient kidneys. They excrete an exceedingly small volume of highly-concentrated urine in order not to lose much water from the bodies.
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