Calculate the number of times the DNA of a modern E. coli cell has been copied accurately since its earliest bacterial precursor cell arose about 3.5 billion years ago. Assume for simplicity that over this time period, E. coli has undergone, on average, one cell division every 12 hours (this is an overestimate for modern bacteria, but probably an underestimate for ancient bacteria).

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#Question id: 1232

#Biochemistry

Which of the following mutations might confer a competitive advantage to an athlete by raising his or her hematocrit?

a. excess production of erythropoietin                       

b. decreased production of erythropoietin

c. EpoR that cannot bind STAT5                  

d. EpoR that cannot bind SHP1

e. EpoR that cannot bind JAK2

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#Question id: 88

#Biochemistry

Anomers can be interconverted ________.

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#Question id: 27159

#Biochemistry

This event can cause a damage to the hypothalamus portal system

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#Question id: 294

#Biochemistry

Which of the following pairs of amino acids would you predict to only participate in Van der Waals interactions in the three dimensional folding of a protein:

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#Question id: 27210

#Biochemistry

Charge on one mol of electron is approximately equal to

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#Question id: 27211

#Biochemistry

 A biological redox reaction always involves