NEET UG · Biology

Genetics and molecular biology

19 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 19 questions

  1. Which enzyme unwinds the DNA double helix during replication?
  2. Which enzyme joins DNA fragments together, for example Okazaki fragments?
  3. Mendel's law of segregation states that
  4. Which of the following disorders is sex-linked?
  5. Down syndrome is caused by
  6. During DNA replication in prokaryotes, which enzyme removes the RNA primer and replaces it with deoxyribonucleotides?
  7. In the lac operon of Escherichia coli, the repressor protein is encoded by which gene?
  8. What is the expected phenotypic ratio in the F2 generation of a Mendelian dihybrid cross involving two independently assorting unlinked genes?
  9. Which of the following genetic codons acts as both an initiation codon for translation and codes for the amino acid Methionine?
  10. Sickle cell anemia is caused by a point mutation in the beta-globin chain. Which amino acid substitution occurs at position 6?
  11. Which type of RNA exhibits a clover-leaf secondary structure and carries an anticodon triplet complementary to mRNA?
  12. The historic Hershey-Chase experiment (1952) conclusively demonstrated that DNA is the genetic material using which radioactive isotopes to label bacteriophage components?
  13. A human female with Turner's syndrome exhibits which of the following chromosomal karyotypes?
  14. In eukaryotic post-transcriptional processing, what modification is added to the 5' end of the newly transcribed pre-mRNA?
  15. Which of the following processes represents an example of incomplete dominance in genetics?
  16. During eukaryotic DNA packaging, how many core histone protein molecules constitute a single octamer core around which DNA is wrapped?
  17. Which rule formulated by Erwin Chargaff governs base pairing proportions in double-stranded DNA?
  18. A plant heterozygous for two linked genes, with the alleles in repulsion phase (), is test-crossed with . The recombination frequency between the genes is . What percentage of the…
  19. An autosomal recessive disease affects in people. A healthy man whose brother has the disease (both parents are healthy) marries a healthy woman unrelated to the family. Assuming Hardy–…

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