Quiz  /  Molecular Biology Class 12 MCQ Questions With Answers

  • 1. 
    In replication, ______________ DNA strands are copied and in transcription ____________________ DNA strands are copied.

  • only one of the, both
  • both, only one of the
  • both, both
  • only one of the, only one of the

  • 2. 
    Following transcription in eukaryotes, the RNA

  • stays in the nucleus
  • is made into mRNA and goes to the cytoplasm
  • goes directly to the cytoplasm without changes
  • goes back to the nucleus for changes

  • 3. 
    What are the 2 functions of DNA polymerase?

  • makes DNA and RNA
  • makes DNA and protein
  • makes DNA and fixes its mistakes
  • makes RNA and protein

  • 4. 
    What is the correct description of eukaryotic chromosomes?

  • many linear pieces of DNA in the cytoplasm
  • many linear pieces of DNA in the nucleus
  • one circular piece of DNA in the cytoplasm
  • many circular pieces of DNA in the nucleus

  • 5. 
    Which of the following describes the product of transcription?

  • contains ribose and U''s
  • contains deoxyribose and T's
  • contains ribose and T's
  • contains deoxyribose and U's

  • 6. 
    What is the process of making an RNA copy of a gene?

  • replication
  • transcription
  • translation
  • nucleosomes

  • 7. 
    MRNA is

  • used as a template to make protein
  • part of a ribosme
  • a small molecule used by the ribosome and is not made into protein
  • all of the above

  • 8. 
    Which choice describes a chromosome in a prokaryotic cell?

  • linear in the nucleus
  • circular in the nucleus
  • linear in the cytoplasm
  • circular in the cytoplasm

  • 9. 
    TRNA is

  • used as a template to make protein
  • part of a ribosome
  • a small molecule used by the ribosome and is not made into protein
  • all of the above

  • 10. 
    Where are rRNA and tRNA made in the cell?

  • the nucleolus in the cytoplasm
  • the nucleolus in the mitochondria
  • the nucleolus in the nucleus
  • always in the cytoplasm

  • 11. 
    What does DNA polymerase do?

  • connects sugars and phosphates with weak hydrogen bonds
  • connects sugars and phosphates with strong covalent bonds
  • connects bases with strong hydrogen bonds
  • connects bases with strong covalent bonds

  • 12. 
    Which choices describe DNA replication?

  • semiconservative
  • produces two pieces of DNA identical to the original
  • products are half original and half new
  • all of the above

  • 13. 
    When in the cell cycle is DNA replication?

  • S phase of interphase
  • Go of interphase
  • mitosis
  • meiosis

  • 14. 
    What happens to an mRNA when the protein it is used to make is no longer needed?

  • it is broken down into amino acids and they are reused
  • it is broken down into nucleotides and they are reused
  • it is broken down into glucose and reused
  • it goes back to the nucleus

  • 15. 
    What is the enzyme responsible for DNA replication?

  • DNA polymerase
  • RNA polymerase
  • ribosome
  • nucleolus

  • 16. 
    What enzyme is responsible for transcription?

  • DNA polymerase
  • RNA polymerase
  • ribosomes
  • nucleolus in the nucleus

  • 17. 
    Which of the following describes the products of transcription?

  • long, double stranded RNA
  • short, double stranded DNA
  • long, single stranded RNA
  • short, single stranded RNA

  • 18. 
    Where in the cell does DNA replication occur?

  • always the cytoplasm
  • always the nucleus
  • in the cytoplasm in eukaryotes and the nucleus in prokaryotes
  • in the cytoplasm in prokaryotes and the nucleus in eukaryotes

  • 19. 
    What is the process for making another DNA copy of a chromosome?

  • replication
  • transcription
  • translation
  • chromatin

  • 20. 
    What is the structure of the DNA during DNA replication?

  • wrapped around histones in chromatin form
  • tightly coiled into chromosomes
  • just as it appears in a karyotype
  • DNA has no structure during replication

  • 21. 
    RRNA is

  • used as a template to make protein
  • part of a ribosome
  • a small molecule used by the ribosome and is not made into protein
  • all of the above

  • 22. 
    Where does transcription take place in a cell?

  • always in the nucleus
  • always in the cytoplasm
  • in the nucleus in eukaryotes and the cytoplasm in prokaryotes
  • in the cytoplasm in eukaryotes and the nucleus in prokaryotes

  • 23. 
    What is the first step in both replication and transcription?

  • DNA is unzipped
  • weak hydrogen bonds are broken
  • DNA strands separate
  • all of the above
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