Molecular Biology (Chapter 1-5, 20-23)

122 Questions | Total Attempts: 313

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Molecular Biology Quizzes & Trivia

These are the powerpoint questions he asked I'll add some randoms one later when I get through reading all the chapters. Good luck.


Questions and Answers
  • 1. 
    Some genes located on the same chromosome do not show perfect linkage because?
    • A. 

      They are too close together

    • B. 

      The are interrupted by other genes

    • C. 

      Crossover events occur between homologous genes

    • D. 

      Some genes are deleted

    • E. 

      Too many alleles are present

  • 2. 
    • A. 

      The gene for eye color is located on the X chromosome

    • B. 

      The eye color phenotype is sex-linked

    • C. 

      The females are homozygotes

    • D. 

      The gene for eye color is located on an autosome

    • E. 

      Both (A) and (B) are correct

  • 3. 
    • A. 

      Genes are arragned in a linear order on chromosomes

    • B. 

      Recombination occurs between chromosomes

    • C. 

      There is a mathematical relationship between the distance separtating two genes and the recombination frequency

    • D. 

      Mapping is used to establish the location of genes relative to each other

    • E. 

      Mapping is used to determine the composition of a gene.

  • 4. 
    Evidence that physical recombination occurs between two chromosomes was provided by?
    • A. 

      McClintock and Creighton

    • B. 

      Watson and Crick

    • C. 

      Avery, McLeod and McCarthy

    • D. 

      Hershey and Chase

    • E. 

      Miescher and Morgan

  • 5. 
    The chromosomal theory of inheritance holds that
    • A. 

      Chromosomes vary in size

    • B. 

      The number of chromosomes vary in individuals

    • C. 

      Chromosomes contain histone protiens

    • D. 

      Genes are arranged in a linear order on chromosomes

    • E. 

      Chromosomes condense during mitosis

  • 6. 
    Which of the following was demonstrated by Frederick and Griffiths?
    • A. 

      Nuclein was the possible genetic material

    • B. 

      A genetic trait can be transferred from one organism to another

    • C. 

      Genes are linked

    • D. 

      Corssing over occurs between chromosomes

    • E. 

      Protein is a major component of nuclein.

  • 7. 
    Who first conducted the X-ray diffraction studies of DNA?
    • A. 

      Franklin and Wilkins

    • B. 

      Miescher and McClintock

    • C. 

      Wason and Crick

    • D. 

      Meselson and Stahl

    • E. 

      Avery and Beadle

  • 8. 
    Which of the follwing scientists provided definitive evidence for the chromosomal theory?
    • A. 

      Mendel

    • B. 

      Morgan

    • C. 

      McClintock

    • D. 

      Miescher

    • E. 

      Avery

  • 9. 
    The relationship between genes and enzymes was shown by?
    • A. 

      Watson and Crick

    • B. 

      Beadle and Tatum

    • C. 

      Avery and McLeod

    • D. 

      Morgan and Mendel

    • E. 

      Miescher and Stern

  • 10. 
    The notion of one-gene/one-enzyme is true or not? If not, it is because of which of the following?
    • A. 

      An enzyme can be composed of more than one polypeptide

    • B. 

      Many genes contain the information for making polypeptides that are not enzymes.

    • C. 

      The end products of some genes are not polypeptides

    • D. 

      All A-C are correct

    • E. 

      Only A and B are correct

  • 11. 
    Which of the following is not a product of transcription?
    • A. 

      RNA

    • B. 

      DNA

    • C. 

      RRNA

    • D. 

      TRNA

    • E. 

      MRNA

  • 12. 
    Which of the following is true about wild-type organisms?
    • A. 

      They are always foudn in the wild.

    • B. 

      They are free of all mutations.

    • C. 

      They are also referred to as standard-types

    • D. 

      They carry no recessive genes.

    • E. 

      None of the choices

  • 13. 
    The correct structure of DNA components can be presented as
    • A. 

      Phosphate–base–sugar

    • B. 

      Phosphate-sugar-base

    • C. 

      Base-phosphate-sugar

    • D. 

      Phosphate-sugar-phosphate-base

    • E. 

      Base-sugar-phosphate-base

  • 14. 
    Which of the following is a characteristic of double-stranded DNA?
    • A. 

      2 nanometers in width

    • B. 

      10 base pairs per turn

    • C. 

      0.34 nanometers per basepair

    • D. 

      A and B

    • E. 

      A, B and C

  • 15. 
    Which of the following DNA molecules is the most stable?
    • A. 

      CTGCATAC GACGTATG

    • B. 

      GAAATTTC CTTTAAAG

    • C. 

      AGTCGAAT TCAGCTTA

    • D. 

      GCGTGCAC CGCACGTG

    • E. 

      GGATCCTG CCTAGGAC

  • 16. 
    Double-stranded DNA consists of two antiparallel strands, meaning that one strand is oriented in the 5' to 3' direction, while the other is oriented in the 3' to 5' direction.
    • A. 

      True

    • B. 

      False

  • 17. 
    Asymmetrical spacing of the backbones of the DNA double helix generates major and minor grooves.
    • A. 

      True

    • B. 

      False

  • 18. 
    In experiments conducted by Griffitsh, the inabilityy of the avirulent strain to produce a lethal infection was due to
    • A. 

      The presence of a protective

    • B. 

      Destruction by the host's white blood cells

    • C. 

      The presence of a gene for a polysaccharide coat

    • D. 

      The high body temperature of the host

    • E. 

      None of the choices are correct

  • 19. 
    Experiments conducted by Frederick Griffiths laid the foundation for?
    • A. 

      Elucidation of mRNA structure

    • B. 

      DNA as the genetic material

    • C. 

      The virulence of S. pneumoniae

    • D. 

      The discovery of the capsule of S. pneumoniae

    • E. 

      Elucidaiton of tRNA structure.

  • 20. 
    Which of the following would be the substance of choice to destroy the DNA in a solution?
    • A. 

      Ribonuclease

    • B. 

      Trypson

    • C. 

      Chymotrypsin

    • D. 

      Deoxyribonuclease

    • E. 

      None of the choices are correct

  • 21. 
    The analytic tools used to show that DNA was the transforming substance include all of the following except
    • A. 

      Ultracentrifugation

    • B. 

      Electrophoresis

    • C. 

      UV absorption spectrophotometry

    • D. 

      Heat inactivation

    • E. 

      Chemical analysis

  • 22. 
    All of the following are found in RNA except
    • A. 

      Adenine

    • B. 

      Deoxyribose

    • C. 

      Cytosine

    • D. 

      Guanine

    • E. 

      Uracil

  • 23. 
    Which of the following is not found in RNA and DNA?
    • A. 

      Nitrogen

    • B. 

      Oxygen

    • C. 

      Carbon

    • D. 

      Sulfur

    • E. 

      Hydrogen

  • 24. 
    The bonds that connect adenine to thymine in a DNA double helix are
    • A. 

      Ionic

    • B. 

      Hydrophobic

    • C. 

      Hydrogen

    • D. 

      Covalent

    • E. 

      One of the choices are correct

  • 25. 
    Phosphodiester bonds are examples of
    • A. 

      Hydrophobic interactions

    • B. 

      Hydrogen bonds

    • C. 

      Convalent bonds

    • D. 

      Noncovalent bonds

    • E. 

      Ionic bonds