题目内容

The final catabolic product of purine base is ( )

A. uric acid
B. urea
C. glycerol
D. cholesterol
E. malate

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The main organ for biotransformation is ( )

A. Lung
B. liver
C. kidney
D. gastrointestinal tract
E. skin

According to origin, glycodeoxycholic acid belongs to ( )

A. primary bile acid and.
B. secondary bile acid
C. free bile acid
D. conjugated bile acid
E. all the above

In the process of DNA replication, lagging strand is synthesized in the opposite direction of fork movement and discontinuously.We call it()

A. replication fork
B. Okazaki fragment
C. leading strand
D. lagging strand
E. all the above

In prokaryotes, many enzymes are involved in DNA replication, including ①DNA-pol Ⅲ ②helicase ③DNA-polⅠ④ primase ⑤DNA ligase ⑥topoisomerase.These enzymes do their function in a special sequence, this sequence should be ( )

A. ⑥→②→③→①→④→⑤
B. ⑥→②→④→①→③→⑤
C. ④→①→④→⑤→②→⑥
D. ③→④→⑤→②→①→⑥
E. ④→⑥→①→③→②→⑤

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