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NEET UG Neet B07 — practice questions

Explore 12 free Neet B07 questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Neet B07 questions and exercises with answers

Showing questions 1–12 of 12.

Which sugar–base pair is characteristic of RNA?Read the answer and worked solution →Which enzyme blocked transformation in Avery, MacLeod and McCarty’s experiment?Read the answer and worked solution →Heavy-labelled E. coli enter ¹⁴N medium. After two DNA replications, which DNA types occur?Read the answer and worked solution →Which codon both specifies methionine and serves as an initiation codon?Read the answer and worked solution →Which observation did von Baer use to reject strict embryonic recapitulation?Read the answer and worked solution →Similar genes and proteins performing the same function in diverse species chiefly suggest:Read the answer and worked solution →Modern evolutionary synthesis connects natural selection with which explanation of heritable variation?Read the answer and worked solution →Selection favours one extreme of a heritable trait, shifting its mean. Which type is this?Read the answer and worked solution →Both extremes of a heritable trait are favoured over intermediates. This is:Read the answer and worked solution →The whole-genome sequencing approach in HGP included which DNA?Read the answer and worked solution →Why can DNA polymorphisms help establish parentage?Read the answer and worked solution →Thalassemia is classically autosomal recessive and primarily causes:Read the answer and worked solution →

Worked practice questions

Which sugar–base pair is characteristic of RNA?

  1. Deoxyribose and thymine
  2. Ribose and uracil
  3. Ribose and thymine
  4. Deoxyribose and uracil
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Correct answer: B. Ribose and uracil

RNA contains ribose, with a 2′-OH group, and uses uracil in place of thymine. DNA contains deoxyribose and thymine.

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Which enzyme blocked transformation in Avery, MacLeod and McCarty’s experiment?

  1. Protease
  2. RNase
  3. DNase
  4. Lipase
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Correct answer: C. DNase

DNase digested DNA and prevented transformation of R bacteria into S bacteria. Protease and RNase did not prevent it, identifying DNA as the transforming material.

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Heavy-labelled E. coli enter ¹⁴N medium. After two DNA replications, which DNA types occur?

  1. Only heavy
  2. Only hybrid
  3. Heavy and light, equally
  4. Hybrid and light, equally
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Correct answer: D. Hybrid and light, equally

The first replication gives only hybrid DNA. In the second, each hybrid yields one hybrid and one light molecule, so the two types occur in equal amounts.

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More Biology topics

Genetics and EvolutionReproduction in Organisms & PlantsBiotechnology and ApplicationsBiodiversity and ConservationThe Living World & Biological ClassificationNeural Control and Chemical CoordinationPrinciples of Inheritance and VariationAnimal Kingdom