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Molecular Basis of Inheritance Test - 70

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Molecular Basis of Inheritance Test - 70
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Weekly Quiz Competition
  • Question 1
    1 / -0
    DNA replicates semiconservatively was first shown in
  • Question 2
    1 / -0
    Which aminoacid is determined by 4 genetic codes
  • Question 3
    1 / -0
    Which of the following is true with reference to transformation in bacteria
    i) Transfer of genetic material is mediated by F factor
    ii) Uptake of DNA fragments from the surrounding environment and expression of that genetic information in recipient cell 
    iii) Transformation experiments were the basis to propose chromosomal theory of inheritance
    iv) Transformation was discovered by Griffith in Streptococcus pneumonia
  • Question 4
    1 / -0
    The codons UUU and UUC codes for phenylalanine only. This feature of genetic code is called
  • Question 5
    1 / -0
    A molecule that acts as a genetic material must fulfill the traits given, except
  • Question 6
    1 / -0
    Escherichia coli in which both the strands are labelled with $$^{15}N$$ is transferred to $$^{14}N$$ medium and allowed to replicate for two generations. Find the number of hybrid DNA molecules in the second generation
  • Question 7
    1 / -0
    Read the following statements carefully and choose the correct ones
    a) In a transcription unit, the promoter located at the 5 end of coding strand
    b) The single strand DNA having the polarity 5 3 is the template strand
    c) RNA polymerase binds to the operator during transcription
    d) Single base DNA difference occuring in humans are called Single Nucleotide Polymorphism (SNP)
  • Question 8
    1 / -0
    During replication, DNA gyrases takes part in 
  • Question 9
    1 / -0
    As per latest information human genome has
    Solution
    There are an estimated 19,000-20,000 human protein-coding genes. The estimate of the number of human genes has been repeatedly revised down from initial predictions of 100,000 or more as genome sequence quality and gene finding methods have improved and could continue to drop further.
    So, the correct answer is '20,000 genes'.
  • Question 10
    1 / -0
    Whose experiments cracked the genetic code and discovered unequivocally that genetic code is triplet
    Solution

    The Nirenberg and Matthaei experiment was a scientific experiment performed in May 1961 by Marshall W. Nirenberg and his post-doctoral fellow, J. Heinrich Matthaei at the National Institutes of Health (NIH). The experiment deciphered the first of the 64 triplet codons in the genetic code by using nucleic acid homopolymers to translate specific amino acids.In the experiment, an extract from bacterial cells that could make protein even when no intact living cells were present was prepared. Adding to this extract an artificial form of RNA consisting entirely of uracil-containing nucleotides (polyuridylic acid or poly-U), caused it to make a protein composed entirely of the amino acid phenylalanine. This experiment cracked the first codon of the genetic code and showed that RNA controlled the production of specific types of protein.

    So,the correct option is 'A'.

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