How does pyrimidine synthesis differ from purine synthesis?
Pyrimidine (U & C) Biosynthesis

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Science, Chemistry, Biology
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Pyrimidine synthesis uses the same pathway as purine synthesis.
Pyrimidine synthesis occurs separately from the ribose ring.
Pyrimidine synthesis involves a double ring structure.
Pyrimidine synthesis occurs on the ribose ring.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of aspartate transcarbamoylase in pyrimidine synthesis?
It converts UMP to UTP.
It catalyzes the formation of N-carbamoyl aspartate.
It synthesizes purine nucleotides.
It is not involved in pyrimidine synthesis.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of PRPP in pyrimidine synthesis?
It is not involved in pyrimidine synthesis.
It converts UMP to CTP.
It inhibits aspartate transcarbamoylase.
It acts as a ribose phosphate donor.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the significance of orotidylate decarboxylase in pyrimidine synthesis?
It directly synthesizes CTP.
It is not involved in pyrimidine synthesis.
It converts UTP to CTP.
It enhances the reaction rate by millions of years.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is UMP converted to UTP?
By a single kinase reaction.
By two phosphorylation steps.
By direct conversion to CTP.
By removal of a phosphate group.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What regulates the activity of aspartate transcarbamoylase?
The presence of UMP.
The end product CTP.
The presence of thymine.
The presence of ATP.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the order of synthesis for pyrimidines?
C, T, U
T, C, U
C, U, T
U, C, T
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