题目内容

Which statement for purine biosynthesis is incorrect?

A. Requires vitamin B12
B. Assembled on ribose phosphate
C. Requires PRPP
D. Requires glycine

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Nitrogen or carbon atoms are contributed to the structure of the purine ring by amino acids, except:

A. Glycine
B. Glutamine
C. Aspartate
D. Glutamate

Lesch-Nyhan syndrome may lead to:

A. Self-destructive behavior
B. Gout
C. Elevated levels of PRPP
D. All of the above

Lesch-Nyhan syndrome is due to the lack of:

A. HGPRTase
B. APRTase
C. Adenosine deaminase
D. PRPP amidotransferase

假设a=7，b=10，那么a&b的值是（）。

A. 1
B. 0
C. 0000 0010B
D. 0000 1111B