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MCQs

Total Questions : 34 | Page 3 of 4 pages
Question 21.  Which of the following has been used as an evidence that primitive life forms lacked both DNA and enzymes?
  1.    RNA can both code genetic information and act as a catalyst
  2.    DNA and enzymes are only present in the most advanced cells
  3.    Advanced cells lack RNA
  4.    All of the above
 Discuss Question
Answer: Option A. -> RNA can both code genetic information and act as a catalyst
Question 22.  Crick demonstrated that the genetic code involved three bases and suggested that the code was degenerated. What experimental technique Crick conducted to suggest genetic code degeneration?
  1.    Gel electrophoresis
  2.    Density gradient centrifugation
  3.    Frameshift mutagenesis
  4.    Restriction digests of the rII gene
 Discuss Question
Answer: Option C. -> Frameshift mutagenesis
Question 23.  Codon that specify the amino acids often differs in the
  1.    first base
  2.    second base
  3.    third base
  4.    none of these
 Discuss Question
Answer: Option C. -> third base
Question 24.  In some organelles in eukaryotes, the genetic code for some codons
  1.    differs from that used in prokaryotes
  2.    are same
  3.    are partially same
  4.    none of the above
 Discuss Question
Answer: Option A. -> differs from that used in prokaryotes
Question 25.  The codons which do not specify an amino acid are called
  1.    initiation code
  2.    termination code
  3.    propagation code
  4.    none of these
 Discuss Question
Answer: Option B. -> termination code
Question 26. . 
The genetic code is degenerated. Which of the following codons represents the principle of degeneracy?
  1.    UAA and UAC
  2.    AUG and AUA
  3.    CAU and CAC
  4.    UUA and UUC
 Discuss Question
Answer: Option C. -> CAU and CAC
Question 27. . The sequence of one strand of DNA is: 5' ATTGCCA 3', what is the sequence of the other strand?
  1.    5' TAACGGT 3'
  2.    5' TGGCAAT 3'
  3.    5' ATTGCCA 3'
  4.    5' UAAGCCU3'
 Discuss Question
Answer: Option B. -> 5' TGGCAAT 3'
Question 28. . In prokaryotes, AUG encodes
  1.    methionine
  2.    N-formyl methionine
  3.    a stop codon
  4.    alanine
 Discuss Question
Answer: Option B. -> N-formyl methionine
Question 29. . How many amino acids will be encoded by 5' GAU GGU UGA UGU 3' sequence?
  1.    One
  2.    Two
  3.    Three
  4.    Four
 Discuss Question
Answer: Option B. -> Two
Question 30. . In protein synthesis in prokaryotes
  1.    the initiating amino acid is N- formyl methionine
  2.    the initiating amino acid is methionine
  3.    the initiating amino acid is phenyl alanine
  4.    none of the above
 Discuss Question
Answer: Option A. -> the initiating amino acid is N- formyl methionine

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