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【多选题】
What is the biological and pharmaceutical role of D-amino acids?A.
Although D-amino acids do not generally occur in proteins, they do serve some special functions in the structure of bacterial cell walls and peptide antibiotics.
B.
Bacterial peptidoglycans contain both D-alanine and D-glutamate. D-Amino acids arise directly from the L isomers by the action of amino acid racemases, which have pyridoxal phosphate as cofactor. Amino acid racemization is uniquely important to bacterial metabolism, and enzymes such as alanine racemase are prime targets for pharmaceutical agents.
C.
One such agent, L-fluoroalanine, is being tested as an antibacterial drug. Another, cycloserine, is used to treat tuberculosis.
D.
Because these inhibitors also affect some PLP-requiring human enzymes, however, they have potentially undesirable side effects.
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【简答题】企业的序时账簿和分类账簿必须采用订本式账簿．【】
【单选题】用EDTA法测定铜合金(u,Zn,P)中Zn和P的含量时,一般将制成的铜合金试液先用KN在碱性条件下遮蔽去除u2+,Zn2+后,用EDTA先滴定P2+,然后在试液中加入甲醛,再用EDTA滴定Zn2+,下列说法错误的是()
A.
Pb的测定属于直接测定
B.
Zn的测定属于置换滴定
C.
甲醛是遮蔽剂
D.
KCN是遮蔽剂
【简答题】按化学成分的不同,钢筋可以分为
【简答题】企业的序时账簿和分类账簿必须采用订本式账簿。（ ）
【单选题】用EDTA法测定铜合金(u,Zn,P)中Zn和P的含量时,一般将制成的铜合金试液先用KN在碱性条件下遮蔽去除u2+,Zn2+后,用EDTA先滴定P2+,然后在试液中加入甲醛,再用EDTA滴定Zn2+,下列说法错误的是
A.
Pb的测定属于直接测定
B.
Zn的测定属于置换滴定
C.
甲醛是解蔽剂
D.
KCN是遮蔽剂
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