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MCQs

Total Questions : 282 | Page 3 of 29 pages
Question 21. 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'
Answer: (b).5' TGGCAAT 3'
Question 22. In prokaryotes, AUG encodes
  1.    methionine
  2.    N-formyl methionine
  3.    a stop codon
  4.    alanine
 Discuss Question
Answer: Option B. -> N-formyl methionine
Answer: (b).N-formyl methionine
Question 23. 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
Answer: (a).the initiating amino acid is N- formyl methionine
Question 24. 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
Answer: (b).Two
Question 25. AUG codes for methionine act as a
  1.    initiation code
  2.    elongation code
  3.    termination code
  4.    propagation code
 Discuss Question
Answer: Option A. -> initiation code
Answer: (a).initiation code
Question 26. The transfer of antibiotic-resistant genes from genetically engineered bacteria to disease-causing bacteria __________ .
  1.    would be of no concern if it occurred.
  2.    has occurred
  3.    can never occur
  4.    seems unlikely
 Discuss Question
Answer: Option D. -> seems unlikely
Answer: (d).seems unlikely
Question 27. Both DNA gel electrophoresis and SDS-PAGE of proteins are similar because
  1.    in both cases molecules migrate to the anode
  2.    both techniques rely on a constant charge to mass ratio
  3.    both techniques utilize the sieving properties of gels
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 28. Plant transformation can be obtained by
  1.    combining plant and animal cells in culture
  2.    shooting DNA into plant cells with a gun
  3.    using the E. coli bacterium to infect plant roots
  4.    infecting plants with a tobacco mosaic virus
 Discuss Question
Answer: Option B. -> shooting DNA into plant cells with a gun
Answer: (b).shooting DNA into plant cells with a gun
Question 29. Some genetic diseases cannot be diagnosed by changes in restriction sites. Some of these can be detected by allele-specific oligonucleotide probes. These are
  1.    copies of the gene with an altered sequence so that a restriction site is inserted
  2.    mutagenized copies of a gene
  3.    short sequences that will hybridize only to a specific base sequence
  4.    PCR-amplified variable numbers of tandem repeats (VNTRs)
 Discuss Question
Answer: Option C. -> short sequences that will hybridize only to a specific base sequence
Answer: (c).short sequences that will hybridize only to a specific base sequence
Question 30. In order to insert a foreign gene into a plasmid, both must __________
  1.    have identical DNA sequences
  2.    originate from the same type of cell
  3.    be cut by the same restriction enzyme
  4.    be of the same length
 Discuss Question
Answer: Option C. -> be cut by the same restriction enzyme
Answer: (c).be cut by the same restriction enzyme

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