题目
BIOL 1009 (001-006/050-055) Midterm Exam III
单项选择题
DNA is replicated continuously along one strand and in fragments (Okazaki fragments) along the other strand because
选项
A.amino acids are added one at a time to polypeptides.
B.one strand of DNA is cleaved before replication.
C.enzymes that facilitate DNA replication add nucleotides only to the 3' end of the growing molecule
D.genes are segments of DNA.
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标准答案
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思路分析
To understand why DNA is replicated continuously on one strand and in Okazaki fragments on the other, we need to recall how DNA polymerase works.
Option 1: 'amino acids are added one at a time to polypeptides.' This describes protein synthesis (translation), not DNA ......Login to view full explanation登录即可查看完整答案
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类似问题
Which of the following is needed for DNA synthesis within a bacterial cell but is not needed during PCR in a test tube?
What is the function of DNA polymerase?
Dr. Dre has decided that he wants to cure cancer and so has designed a bunch of compounds to inhibit various enzymes involved in DNA replication. He tests each of the 5 compounds against the enzymatic activity of each of the DNA replication enzymes and records what each one does to work out what they do. He concludes that [ Select ] Compound B Compound E Compound D Compound A Compound C would prevent the replacement of RNA sequences with DNA, while [ Select ] Compound B Compound C Compound D Compound A Compound E would prevent all steps in DNA replication. He predicts that [ Select ] Compound E Compound D Compound B Compound C Compound A would leave the replicated DNA strand as a series of separate DNA fragments, but that [ Select ] Compound A Compound B Compound D Compound E Compound C would lead to the death of the cell upon DNA replication. Finally, he concludes that [ Select ] Compound D Compound C Compound A Compound E Compound B would prevent the formation of both the leading and lagging strands.
Dr. Dre has decided that he wants to cure cancer and so has designed a bunch of compounds to inhibit various enzymes involved in DNA replication. He tests each of the 5 compounds against the enzymatic activity of each of the DNA replication enzymes and records what each one does to work out what they do. He concludes that [ Select ] Compound A Compound D Compound E Compound B Compound C would prevent the replacement of RNA sequences with DNA, while [ Select ] Compound C Compound B Compound E Compound A Compound D would prevent all steps in DNA replication. He predicts that [ Select ] Compound A Compound E Compound B Compound C Compound D would leave the replicated DNA strand as a series of separate DNA fragments, but that [ Select ] Compound C Compound D Compound B Compound E Compound A would lead to the death of the cell upon DNA replication. Finally, he concludes that [ Select ] Compound B Compound C Compound A Compound E Compound D would prevent the formation of both the leading and lagging strands.
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