题目内容

A man suffers from fragile X syndromen. The cause is that n turns to 300 from 60. Then which the following is the cause of this disease:()

A. synonymous mutation
B. missense mutation
C. nonsense mutation
D. frameshift mutation
E. dynamic mutation

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In nucleic acid, the point mutation is:()

A. One base-pair is replaced by another is called point mutation
B. Only the mutation that leads to the change of amino acid can be called point mutation
C. The mutation that don’t change phenotype is called point mutation
D. The mutation that causes dysfunction of a single gene is called point mutation

Frameshift mutation results from base-pairs:()

A. Transition
B. Transversion
C. Hydrolysis
D. Insertion
E. Oxidation

Which of the following are not functions of the core of DNA pol:()

A. Synthesis of DNA in 5’→3’ direction
B. Synthesis of DNA in 3’→5’ direction
C. Proofreading
D. Ligation of Okazaki fragments

In prokaryotes, which of the following enzymes may be functional both in the processes of removing RNA primer and adding deoxyribonuleotides:()

A. DNA polymerase III
B. DNA polymerase II
C. DNA polymerase I
D. exonuclease MFI
E. DNA ligase

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