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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.
How several bacteria were on the soap? How did they get there. Unlike squamous cells, cuboidal and columnar cells have large, open cytoplasms. Which functions of epithelial tissue are supported by having such big cells.
One way of expressing rate at which enzyme can catalyze a reaction is to give turnover number. The turnover number is maximum number of substrate molecules that can be acted on one molecule of enzyme per unit of time.
Are fungi gram positive or gram negative? Explain based on the structure of its cellular envelope and explain the basis for your answer in terms of specific non-informational macromolecules.
A mainland population of 10,000 ground beetles have the neutral alleles A1 and A2 with frequencies of A1 = 0.4 and A2 = 0.6. 16 male and 20 female beetles found a new population on Russell Island.
Acetylcholine acts at the G-protein-linked receptor on heart muscle to make the heart beat more slowly by the effect of the G protein on a K+ channel. Which one or more of next would enhance this effect of acetylcholine.
Distinguish between morphological, phylogenetic, and biological species concepts. What are the advantages and disadvantages of each?
Disulfide Bonds Determine the Properties of Many Proteins Some natural proteins are rich in disulfide bonds, and their mechanical properties are correlated with the degree of disulfide bonding.
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.
DNA microarray analysis of patterns of mRNA abundance in different human cell types shows that the level of expression of almost every active gene is different.
Suppose that one hundred percent efficiency of energy conservation, how many moles of ATP can be synthesized under standard conditions by the complete oxidation of 1 mol of palmitate?
What are the four major arthropod phyla living today? which one contains the insects,and which the spider,and which the centipedes?
If a transferrin receptor has a cross-sectional area of 50 Angstroms X 100 angstroms (5x10nm), and how many receptors could be accomodated in a 100nm clathrin-coated vesicle assume that only 50% of surface area can be occupied by proteins.
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