在成立创业公司之前，就应该制定好股权结构和相关的制度，这对于创业团队的未来融资、发展决策的决定，甚至于创业的成功与否都起着重要的作用。（ ）
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合伙人的出资比例是股权分配的必要依据，也是唯一依据。
A. 对
B. 错
Purines and pyrimidines are:
A. Dietary essential
B. Dietary nonessential
C. Derived from essential fatty acids
Derivatives of essential amino acid
Which statement for purine biosynthesis is incorrect?
A. Requires vitamin B12
B. Assembled on ribose phosphate
C. Requires PRPP
D. Requires glycine
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
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