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Using a spectrophotometer set at 400 nm, an absorbance reading of 0.050 was obtained for a solution of p-nitrophenol at pH 6.5. The molar extinction coefficient of p-nitrophenol 21500 M-1cm-1 and th
Certain unscrupulous operators offer, for a fee, to freeze recently deceased individuals in liquid nitrogen until medical science can cure the disease from which they died. What is the biochemical f
What is the yield of ATP when each of the following substrates is completely oxidized to CO2 by a mammalian cell homogenate? Assume that glycolysis, the citric cycle and oxidative phosphorylation ar
Conduction of protons by the F0 unit of ATP synthase is blocked by modification of a single side chain by dicyclohexylcarboiimide (DCCD). What are the most likely targets of action of this reagent.
What are the arguments for and against the production of embryonic stem cells.
Why do potential space explorers need to be able to produce all of the food that they will need, regardless of whether life is found elsewhere.
If silicon-based life exists, would it be able to consume carbon-based life, digest it, and use the products as nutrients? Why or why not.
Describe the relationship between biological psychology and other fields in psychology and neuroscience.
This is to be a philosophical discussion.What are the characteristics of life? There are some things, like planets, stars, viruses and prions that have many of the characteristics of life.
A 5.0 mL aliquot of a stock tryptophan solution was diluted by adding 95 mL of water. The absorbance of that diluted solution was measured at 280 nm as 0.055 absorbance units.
If you wanted to make 100 mL of a 5mM ascorbic acid solution and you have on hand a 35mM ascorbic acid solution, how would you make it.
What is needed for photosynthesis and what is the wast product of photosynthesis? Also, given what you know about photosystems and how plants use visible light in photosynthesis.
Data from enzyme kinetic studies of an enzyme at specific substrate concentration. Data below also include from studies with town different inhibitors.
A drug impairs oxyegen consumption on liver mitochondria at a buffer of 7.4pH, Mg, and adp. It inhibits O2 uptake if isocitrate, 2-ketoglutarate and malate were substrates, but it will NOT is succin
An experiment was performed to determine the effects of an inhibitor on the breakdown of glycogen by an enzyme. In an accompanying experiment.
You have isolated a factor from the blood of a space alien and named it XFF (for X-files factor). Based on preliminary data, you think that XFF could be one of three compounds normally found in huma
What is the role of the urea cycle, and what are the effects on an individual of a deficiency in one of the required enzymes.
The same domains and/or motifs are found in many proteins. In fact, a protein's tertiary structure is more conserved (stays the same or similar over many generations) than its amino acid structure.
Describe in your own words how Christian Anfinsen's ribonuclease renaturation experiments showed that amino acid sequence determines tertiary structure.
Bisphenol A (BPA) binds to estrogen receptor with a Kd of 2.1 x 10-7 M and an association rate of 1.3 x 106 M-1s-1. Calculate the dissociation rate, kd, including appropriate units.
If you were offered a procedure that allowed you to acquire this ability, would you accept? Why or why not.
I would also like to know how DDT is transported through the cell membranes. Is it passive diffusion, facilitated diffusion, filtration, active transport, etc. I know it is lipid soluble.
A paragraph description is included that tells in relative detail the various steps, and then a brief numbered list of events is given for quick reference in order to improve understanding of this c
Since all action potentials are identical, the intensity of a sensation depends on.
I thought if a positively charged residue was the c-terminal end of the primary peptide, then I should have seen fragments from carboxypeptidase B, since there is no blocking proline by either the A