A coenzyme frequently encountered in transamination reactions is ...

[futuristic]

A coenzyme frequently encountered in transamination reactions is
  a.
  tetrahydrofolate
  b.
  pyridoxal phosphate
  c.
  thiamine pyrophosphate
  d.
  biotin

Question 2

Consider the deamination of serine to answer the following questions.
   
  a)
  Draw the structure of the a-keto acid produced by the deamination of serine.
   
   
  b)
  What is the fate of the amino group in serine when this conversion occurs in a mammalian system?

Question 3

Many biological reactions are endergonic. Explain how it is possible that these reactions occur spontaneously.

[Yixagurpuldink]

Answer to Question 1

b

Answer to Question 2

a)


b)
The amino group is removed in the deamination as ammonia. The ammonia is in turn converted into urea and excreted during the urea cycle.

Answer to Question 3

Endergonic reactions such as the conversion of glucose to glucose-6-phosphate are coupled with highly exergonic reactions such as the hydrolysis of ATP to ADP such that the overall reaction is exergonic and therefore spontaneous.