1. Which of these statements about the urea cycle is incorrect? a.) Is required
ID: 1051312 • Letter: 1
Question
1. Which of these statements about the urea cycle is incorrect?
a.) Is required to remove excess nitrogen
b.) Will be active after a diet rich in proteins
c.) Will be active after a diet rich in carbohydrates
d.) Requires energy in the form of ATP
e.) Results in formation of fumarate, which can return to the TCA cycle
2. PRPP is used for the production of which nucleotide?
a.) adenosine 5’phosphate
b.) guanosine 5’phosphate
c.) cytidine 5’phosphate
d.) uridine 5’phopshate
e.) all of the above
3. ATP is an excellent source of energy for AMP biosynthesis from IMP.
a.) True
b.) False
4.Fluoro-dUMP is a chemical often used for chemotheraphy because:
a.) dTMP biosynthesis is inhibited by Fluoro-dUMP
b.) Cancer cells are mitotically active cells and require DNA biosynthesis
c.) Fluoro-dUMP is an effective inhibitor of thymidylate synthetase, which is required for DNA production
d.) dTTP is required for DNA biosynthesis and not RNA production
e.) all of the above
Explanation / Answer
1. Answer:-c
Urea cycle basically convert ammonia to urea utilising ATP as energy form. So we can say that it remove excess Nitrogen from body. In this amino acids are required so it occur after protein rich diet.
In one of the steps fumarate is also formed.
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