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Bihar Board Class 12 (Science) Genetics and Evolution — practice questions — page 4

Explore 116 free Genetics and Evolution questions in Bihar Board Class 12 (Science) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Genetics and Evolution questions and exercises with answers

Showing questions 91–116 of 116.

Naming the processesRead the answer and worked solution →During transcription, the enzyme that synthesises mRNA from DNA is:Read the answer and worked solution →DNA or RNA?Read the answer and worked solution →The central dogma of molecular biology states the flow of information asRead the answer and worked solution →A person with blood group AB has genotypeRead the answer and worked solution →The ABO blood-group system is an example ofRead the answer and worked solution →The phenotypic ratio in the F₂ of a Mendelian dihybrid cross (with two independently assorting genes) isRead the answer and worked solution →The wings of insects and the wings of birds are best described as:Read the answer and worked solution →Genetic drift is STRONGEST in which type of population?Read the answer and worked solution →The mechanism of evolution proposed by Darwin isRead the answer and worked solution →Homo sapiens (modern humans) first evolved in:Read the answer and worked solution →The human APPENDIX is a classic example of a:Read the answer and worked solution →The shift in peppered moth (Biston betularia) colour during the Industrial Revolution is an example of:Read the answer and worked solution →The Hershey-Chase experiment (1952) proved that:Read the answer and worked solution →The Hardy-Weinberg principle's equation for genotype frequencies is:Read the answer and worked solution →The total number of possible codons in the genetic code isRead the answer and worked solution →In a DNA double helix, adenine pairs with thymine throughRead the answer and worked solution →In DNA, Adenine (A) pairs with Thymine (T) via:Read the answer and worked solution →The 14 species of finches that Darwin observed on the Galapagos Islands are a classic example of:Read the answer and worked solution →The two strands of a DNA double helix areRead the answer and worked solution →The genotypic ratio in the F₂ of a monohybrid cross between Tt × Tt isRead the answer and worked solution →The Lac Operon in E. coli is INDUCED (turned ON) by the presence of:Read the answer and worked solution →The Human Genome Project (HGP) ran from 1990 to:Read the answer and worked solution →The Miller-Urey experiment (1953) demonstrated that:Read the answer and worked solution →Dominant or recessive?Read the answer and worked solution →Genotype and phenotypeRead the answer and worked solution →

Worked practice questions

Naming the processes

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Questions
  1. Question
    Making DNA from DNA is
    Choices
    1. transcription
    2. replication
    3. translation
    Correct choice
    replication
  2. Question
    Making RNA from DNA is
    Choices
    1. replication
    2. translation
    3. transcription
    Correct choice
    transcription
  3. Question
    Making protein from RNA is
    Choices
    1. translation
    2. replication
    3. transcription
    Correct choice
    translation
Three steps, three names. Source: syllabus Biology, Molecular Basis of Inheritance.

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During transcription, the enzyme that synthesises mRNA from DNA is:

  1. DNA polymerase (replication)
  2. Ligase (seals nicks)
  3. Helicase (unzips DNA)
  4. RNA polymerase (transcription)
Show answer and solution

Correct answer: D. RNA polymerase (transcription)

RNA polymerase reads the DNA template 3'→5' and synthesises mRNA 5'→3'. DNA polymerase is for DNA replication helicase unzips; ligase joins Okazaki fragments.

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DNA or RNA?

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Items
  1. Item
    The genetic material in most organisms
    Category
    DNA
  2. Item
    Double stranded
    Category
    DNA
  3. Item
    Carries the message to the ribosome
    Category
    RNA
  4. Item
    Usually single stranded
    Category
    RNA
Categories
  1. Item
    DNA
  2. Item
    RNA
Two nucleic acids with different roles. Source: syllabus Biology, Molecular Basis of Inheritance.

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More Biology topics

Reproduction in Organisms & PlantsBiotechnology and ApplicationsBiology in Human Welfare & HealthSexual Reproduction in Flowering PlantsMolecular Basis of InheritancePrinciples of Inheritance and VariationHuman Health and DiseaseEvolution