Nucleic Acids - Mock Test 24

Question 231

Haemoglobin S is an example of a/an?

A) Silent mutation B) Acceptable mis-sense mutation C) Unacceptable mis-sense mutation D) Partially acceptable mis-sense mutation

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Question 232

Amino acid sequence of the encoded protein is not changed in?

A) Silent mutation B) Acceptable mis-sense mutation C) Both A and B D) None of these

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Question 233

The effect of a mis-sense mutation can be?

A) Acceptable B) Partially acceptable C) Unacceptable D) All of these

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Question 234

A silent mutation is most likely to result from?

A) Substitution of the first base of a codon B) Substitution of the third base of a codon C) Conversion of a nonsense codon into a sense codon D) Conversion of a sense codon into a nonsense codon

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Question 235

Substitution of a base can result in a?

A) Silent mutation B) Mis-sense mutation C) Nonsense mutation D) All of these

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Question 236

A point mutation results from?

A) Substitution of a base B) Insertion of a base C) Deletion of a base D) All of these

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Question 237

Substitution of a thymine base by adenine in DNA is known as?

A) Transposition B) Transition C) Transversion D) Frameshift mutation

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Question 238

Substitution of an adenine base by guanine in DNA is known as?

A) Transposition B) Transition C) Transversion D) Frameshift mutation

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Question 239

All the following statements about xeroderma pigmentosum are true except?

A) It is a genetic disease B) Its inheritance is autosomal dominant C) uvr ABC excinuclease is defective in this disease D) It results in multiple skin cancers

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Question 240

Xeroderma pigmentosum results from a defect in?

A) uvr ABC excinuclease B) DNA polymerase I C) DNA ligase D) All of these

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