Biochemistry Help

[Fry]

Guys,


I'm taking this bio chemistry class rihgt now and have my exam in two days and am in panic mode!!!

I got my review sheet and for the most part could either answer the questions, or locate the resource to get the answer from other text books or internet

Anyone able to answer these questions?


1. What is the difference between the standard and the physiological free energy change observed in heart muscle cells?


2. Why is catabolism of amino acids important for individuals who have a high protein diet?

3. What are the biochemical properties of the nitric oxide?

4. Explain how cells of vertebres recognize mismatched G-T base pairing on DNA and describe how this is repaired in the cell?

5. Why is RNA polymerasese not able to correct base errors during replication or transcription. Describe the biological consequences of the protein that may develop in this case.



I got the other 25 questions done and it took me over 2 weeks to get those :( I'm scared becuase I cant get these now. If anyone has the right information for these questions I can use to study that would be great becuase my TA has not responded to my cry for help :cry:

[aframe]

2. When protein is in excess the body breaks then down by removing the NH2 (arginine..) in the liver (urea cycle) and then sending the amino acid through gluconeogenesis to make glucose and the NH2 being excreted by the kidney. If we did not catabolize amino acids are bodies would have an electrolyte (K, Na, Ph, Cl, Ca, amino acids, ammonia, glucose,...) imbalance (Excess solute in are Extracellar fluid (ECF) (plasma and fluid outside of cells) As such a higher concentration of solutes in the ECF would draw water from inside cells into the ECF then we would puff up with fluid. Now the kidneys would attempt to remove many of the excess electrolytes but because there is excess amino acids this would create an osmoitic diuresis in the kidneys proximal convoluted tubule. In other words, the high concentration of amino acids would overwhelm the kidney so some amino acids would not be removed and as such greater amounts of other electrolytes who remain in the tubule and be flushed out with the urine. So you would not only be losing amino acids but also other important electrolytes such as Ca, and Na required for normal cell function. Remember the action potential and the required electrolytes.

3. NO (nitric oxide) is a vasodilator of veins and arteries.

This is all that I remember off the top of my head. Hope it helps.