Molecular Genetics - DNA

25 Questions | Total Attempts: 85

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DNA Quizzes & Trivia

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Questions and Answers
  • 1. 
    Why was it important in the studies of Beadle and Tatum that Neurospora was haploid?
    • A. 

      Because it is easier to grow haploid molds in the laboratory

    • B. 

      Because haploid molds have simpler nutritional requirements that do diploid molds

    • C. 

      Because a mutation that arises is not masked by a normal allele on a homologous chromosome.

    • D. 

      Because haploid Neurospora will always mutate

    • E. 

      Because diploid Neurospora will always mutate

  • 2. 
    What conclusions did Beadle and Tatum reach with their studies of Neurospora?
    • A. 

      Each mutant gene affected several enzymes

    • B. 

      Each mutant gene affected a pair of enzymes

    • C. 

      Each mutant gene affected only one enzyme

    • D. 

      Mutant genes had no effect on the enzymes produced by the cells

    • E. 

      None of the above are true

  • 3. 
    Bacteriophages used in Alfred Hershey’s and Martha Chase’s experiments showed that:
    • A. 

      DNA was not injected into bacteria

    • B. 

      Proteins were injected into bacteria

    • C. 

      DNA remained on the outer coat of bacteria

    • D. 

      Proteins were responsible for the production of new viruses within the bacteria

    • E. 

      DNA was injected into bacteria

  • 4. 
    The two molecules that alternate to form the backbone of a polynucleotide chain are:
    • A. 

      Adenine and thymine

    • B. 

      Cytosine and guanine

    • C. 

      Sugar and phosphate

    • D. 

      Base and sugar

    • E. 

      Base and phosphate

  • 5. 
    • A. 

      It contains a large number of different nucleotides

    • B. 

      Its nucleotides can be arranged in a large number of possible sequences

    • C. 

      It is capable of assuming a wide variety of shapes

    • D. 

      Both a and b are correct

    • E. 

      Both a and c are correct

  • 6. 
    Two chains of DNA must run in                  direction(s) and must be                   if they are to bond with each other
    • A. 

      The same; uncomplimentary

    • B. 

      Opposite; uncomplimentary

    • C. 

      Parallel; uncomplimentary

    • D. 

      Parallel; complimentary

    • E. 

      Antiparallel; complimentary

  • 7. 
    Hydrogen bond(s) can form between guanine and                  while hydrogen bond(s) form between adenine and                  
    • A. 

      Phosphate; sugar

    • B. 

      Thymine; cytosine

    • C. 

      Cytosine; thymine

    • D. 

      Sugar; phosphate

    • E. 

      Adenine; guanine

  • 8. 
    The sugar that is in the backbone of DNA is called: 
    • A. 

      Deltaglucose

    • B. 

      Deoxyribose

    • C. 

      Fructose

    • D. 

      Ribose

  • 9. 
    What is the true structure of DNA?
    • A. 

      A double helix

    • B. 

      A molecule

    • C. 

      A strand

    • D. 

      A stranded molecule

    • E. 

      A triple helix

  • 10. 
    In addition to the standard organic elements of carbon, hydrogen and oxygen, nucleic acids also contain                
    • A. 

      Phosphorus

    • B. 

      Calcium

    • C. 

      Nitrogen

    • D. 

      Sulfur

  • 11. 
    What's the name of the monomer that makes up a nucleic acid? 
    • A. 

      Phospholipid

    • B. 

      Nucleotide

    • C. 

      Ribose

    • D. 

      Deoxyribose

  • 12. 
    Which of the following is not part of a nucleotide?
    • A. 

      Nitrogen base

    • B. 

      Monosaccharide sugar

    • C. 

      Phosphate group

    • D. 

      Oxygen base

  • 13. 
    Sugar bonds to                      to form the backbone of DNA
    • A. 

      Carbonate

    • B. 

      Phosphate

    • C. 

      Oxalate

    • D. 

      Sulfate

  • 14. 
    In DNA, adenine forms a complementary pair with what other nitrogen base?
    • A. 

      Uracil

    • B. 

      Cytosine

    • C. 

      Thymine

    • D. 

      Guanine

  • 15. 
    Guanine forms a complementary pair with what other nitrogen base?
    • A. 

      Uracil

    • B. 

      Cytosine

    • C. 

      Thymine

    • D. 

      Adenine

  • 16. 
    According to Chargaff's rule, the following proportion exists in DNA
    • A. 

      C=G

    • B. 

      C>T

    • C. 

      C>G

    • D. 

      C=T

  • 17. 
    By convention, the sequence of bases in a nucleic acid is usually expressed in the                direction
    • A. 

      3' to 1'

    • B. 

      3' to 5'

    • C. 

      1' to 3'

    • D. 

      5' to 3'

    • E. 

      Clockwise

  • 18. 
    In nucleic acids, the free hydroxyl group is attached to the                carbon of the sugar
    • A. 

      5'

    • B. 

      4'

    • C. 

      3'

    • D. 

      2'

    • E. 

      1'

  • 19. 
    In DNA, thymine always pairs with:
    • A. 

      Adenine

    • B. 

      Cytosine

    • C. 

      Guanine

    • D. 

      Thymine

    • E. 

      Uracil

  • 20. 
    In a nucleic acid, the bases are always attached to the                  carbon of the sugar
    • A. 

      5'

    • B. 

      4'

    • C. 

      3'

    • D. 

      2'

    • E. 

      1'

  • 21. 
    In nucleic acids, the phosphate group is attached to the              carbon of the sugar
    • A. 

      5'

    • B. 

      4'

    • C. 

      3'

    • D. 

      2'

    • E. 

      1'

  • 22. 
    The two sides of the double helix structure are held together with hydrogen bonds
    • A. 

      True

    • B. 

      False

  • 23. 
    Base pairs in DNA are linked by what type of bonds?
    • A. 

      Nitrogen

    • B. 

      Oxygen

    • C. 

      Hydrogen

    • D. 

      Sulfate

  • 24. 
    Protein structure and function is determined by the amino acid sequence
    • A. 

      True

    • B. 

      False

  • 25. 
    Genes code for proteins
    • A. 

      True

    • B. 

      False