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MCQs

Total Questions : 34 | Page 2 of 4 pages
Question 11. The sequence of one strand of DNA is: 5' ATTGCCA 3', what is the sequence of the other strand?
  1.    5' UAAGCCU3'
  2.    5' TAACGGT 3'
  3.    5' ATTGCCA 3'
  4.    5' TGGCAAT 3'
 Discuss Question
Answer: Option D. -> 5' TGGCAAT 3'
Question 12. AUG codes for methionine act as a
  1.    propagation code
  2.    initiation code
  3.    elongation code
  4.    termination code
 Discuss Question
Answer: Option B. -> initiation code
Question 13. In prokaryotes, AUG encodes
  1.    a stop codon
  2.    alanine
  3.    methionine
  4.    N-formyl methionine
 Discuss Question
Answer: Option D. -> N-formyl methionine
Question 14. How many amino acids will be encoded by 5' GAU GGU UGA UGU 3' sequence?
  1.    Three
  2.    Four
  3.    One
  4.    Two
 Discuss Question
Answer: Option D. -> Two
Question 15. In protein synthesis in prokaryotes
  1.    the initiating amino acid is phenyl alanine
  2.    the initiating amino acid is methionine
  3.    the initiating amino acid is N- formyl methionine
  4.    None of these
 Discuss Question
Answer: Option C. -> the initiating amino acid is N- formyl methionine
Question 16. Translation begins
  1.    on the lagging strand
  2.    at the start codon
  3.    in nucleus
  4.    at the replication fork
 Discuss Question
Answer: Option B. -> at the start codon
Question 17.  Which of the following techniques was carried out by Nirenberg and Matthaei in 1961 to determine the first codon?
  1.    In vitro synthesis of a polypeptide using UUUUU
  2.    Labeled peptide binding to a ribosome
  3.    Mixed co-polymer mRNA synthesis
  4.    none of the above
 Discuss Question
Answer: Option A. -> In vitro synthesis of a polypeptide using UUUUU
Question 18.  Bacterial protein called catabolic activator protein (CAP) is an example of
  1.    negative control of gene expression
  2.    positive control of gene expression
  3.    second type of positive control of gene expression
  4.    none of the above
 Discuss Question
Answer: Option C. -> second type of positive control of gene expression
Question 19.  How many different codons are possible?
  1.    3
  2.    20
  3.    64
  4.    An infinite number
 Discuss Question
Answer: Option C. -> 64
Question 20.  The genetic code is
  1.    universal
  2.    universal except for rare exceptions in mitochondria and some protozoa
  3.    species-specific
  4.    kingdom-specific
 Discuss Question
Answer: Option B. -> universal except for rare exceptions in mitochondria and some protozoa

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