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 Multiple Choice QuestionsMultiple Choice Questions

81.

If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered?

  • 1

  • 11

  • 33

  • 33

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82.

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement

  • Both are due to a qualitative defect in globin
    chain synthesis

  • Both are due to a quantitative defect in globin chain synthesis

  • Thalassemia is due to less synthesis of globin molecules

  • Thalassemia is due to less synthesis of globin molecules

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83.

All of the following are part of an operon except

  • an operator

  • structural genes

  • a promoter

  • an enhancer


84.

AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?

  • AGGUAUCGCAU

  • UGGTUTCGCAT

  • UCCAUAGCGUA

  • ACCUAUGCGAU


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85.

Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as

  • Polysome

  • Polyhedral bodies

  • Nucleosome

  • Plastidome


86.

Which of the following is true for nucleolus?

  • Larger nucleoli are present in dividing cells

  • It is a membrane-bound structure

  • It is a site for active ribosomal RNA synthesis

  • It takes part in spindle formation


87.

Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?

  • Retrovirus

  • Ti plasmid

  • pBR 322

  • λ phage


88.

Select the correct match

  • Ribozyme - Nucleic acid

  • F2 × Recessive parent - Dihybrid cross

  • G. Mendel - Transformation

  • T.H. Morgan - Transduction


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89.

The experimental proof for semiconservative replication of DNA was first shown in a

  • Fungus

  • Bacterium

  • Virus

  • Plant


B.

Bacterium

Semi-conservative DNA replication was first shown in Bacterium Escherichia coli by Matthew Meselson and Franklin Stahl.


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90.

Which of the following pairs is wrongly matched?

  • Starch synthesis in pea: Multiple alleles

  • ABO blood grouping: Co-dominance

  • T.H. Morgan: Linkage

  • XO type sex determination: Grasshopper


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