Midterm 1 Chee 370

35 Questions | Total Attempts: 91

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Midterm Quizzes & Trivia

Questions and Answers
  • 1. 
    At the end of glycolysis, the original carbons of the glucose molecule form:
    • A. 

      Six molecules of carbon dioxide

    • B. 

      Two molecules of pyruvate

    • C. 

      Two molecules of citric acid

    • D. 

      Two molecules of fructose

    • E. 

      Two molecules of NADH

  • 2. 
    The fat substitute Olestra contains a sucrose backbone with six to eight fatty acids attached. How is this different from a naturally occurring fat?
    • A. 

      It isn't; Olestra and natural fats have the same structure, just different tastes

    • B. 

      Naturally occurring fats contain a glycerol and three fatty acids

    • C. 

      Naturally occurring fats contain a glycerol, two fatty acids, and a phosphate group

    • D. 

      Naturally occurring fats contain a sucrose backbone and three fatty acid chains

  • 3. 
    The small, circular loops of DNA in prokaryotic cells that are separate from the main chromosome and may harbor genes are called
    • A. 

      Cristate

    • B. 

      Ribosomes

    • C. 

      Plastids

    • D. 

      Pili

    • E. 

      Plasmids

  • 4. 
    Termination of RNA synthesis is ultimately determined by
    • A. 

      Exhaustion of RNA polymerase activity

    • B. 

      Special protein factors

    • C. 

      Specific nucleotide sequences on the template strand

    • D. 

      CG-rich sequences followed by AT-rich sequences

  • 5. 
    Which of the following is NOT a common energy carrier in the cell?
    • A. 

      Electron carriers

    • B. 

      ADP

    • C. 

      Phosphate

    • D. 

      ATP

  • 6. 
    The "backbone" of a nucleic acid molecule is made of
    • A. 

      A sugar and phosphate groups

    • B. 

      Nitrogenous bases

    • C. 

      Amino acids

    • D. 

      NAD+ and FAD

    • E. 

      ATP molecules

  • 7. 
    Which cluster of terms accurately reflects the nature of DNA replication in prokaryotes? 
    • A. 

      Random point of initiation, bidirectional, semiconservative

    • B. 

      Fixed point of initiation, bidirectional, conservative

    • C. 

      Random point of initiation, unidirectional, semiconservative

    • D. 

      Fixed point of initiation, unidirectional, conservative

    • E. 

      Fixed point of initiation, bidirectional, semiconservative

  • 8. 
    Complex, three-dimensional, teritiary structures of proteins are characterized by
    • A. 

      An absence of hydrophilic amino acids

    • B. 

      A lack of cysteines in the amino acid sequence

    • C. 

      A helical shape

    • D. 

      Disulfide bonds

  • 9. 
    During which step of aerobic respiration is oxygen used?
    • A. 

      Conversion of pyruvate to acetyl CoA

    • B. 

      Glycolysis

    • C. 

      Fermentation

    • D. 

      Krebs cycle

    • E. 

      Electron transport system

  • 10. 
    If the DNA of a certain organism has guanine as 30% of its bases, then what percentage of its bases are adenine?
    • A. 

      10%

    • B. 

      0%

    • C. 

      20%

    • D. 

      40%

    • E. 

      30%

  • 11. 
    A peptide bond forms between which of these groups?
    • A. 

      Phosphate and hydroxyl

    • B. 

      Carboxyl and aldehyde

    • C. 

      Hydroxyl and carboxyl

    • D. 

      Carboxyl and amino

    • E. 

      Amino and aldehyde

  • 12. 
    Which of the following are among the major components of prokaryotic ribosomes?
    • A. 

      12S rRNA, 5.8S rRNA, and proteins

    • B. 

      15S rRNA, 5.8S rRNA, and 28S rRNA

    • C. 

      18S rRNA, 5.8S rRNA, and proteins

    • D. 

      16S rRNA, 5S rRNA, and 23S rRNA

    • E. 

      Lipids and carbohydrates

  • 13. 
    A denatured protein differs from a normal protein because it
    • A. 

      Is composed of nucleotides

    • B. 

      Contains many disulfide bonds

    • C. 

      Does not contain amino acids

    • D. 

      Has lost its usual secondary and tertiary structures

  • 14. 
    Select three posttranscriptional modifications often seen in the maturation of mRNA in eukaryotes
    • A. 

      3'-capping, 5'-poly(A) tail addition, splicing

    • B. 

      Heteroduplex formation, base modifiction, capping

    • C. 

      5'-capping, 3'-poly(A)tail addition, splicing

    • D. 

      5'-poly(A) tail addition, insertion of introns, capping

    • E. 

      Removal of exons, insertion of introns, capping

  • 15. 
    Which statement is generally true regarding protein synthesis?
    • A. 

      The 23S rRNA plays a role in elongation; the 16S rRNA plays a role in translocation

    • B. 

      The 23S rRNA plays a role in termination; the 16S rRNA plays a role in elongation

    • C. 

      The 23S rRNA plays a role in translocation; the 16S rRNA plays a role in elongation

    • D. 

      The 23S rRNA plays a role in translocation; the 16S rRNA plays a role in initiation

  • 16. 
    Fibers of the cytoskeleton are composed of primarily
    • A. 

      Lipids

    • B. 

      ER

    • C. 

      Nucleic acids

    • D. 

      Proteins

    • E. 

      Polysaccharides

  • 17. 
    What is the significance of the conversion of pyruvate to lactate during fermentation?
    • A. 

      The citric acid cycle is initiated

    • B. 

      The oxidation of pyruvate becomes possible

    • C. 

      ATP is produced

    • D. 

      Pyruvate becomes available to enter mitochondrial matrix reactions

    • E. 

      NAD+ is regenerated for use in glycolysis

  • 18. 
    What primarily determines the shape of animal cells, which lack cell walls?
    • A. 

      Cytoplasm

    • B. 

      Ribosomes

    • C. 

      Endoplasmic reticulum

    • D. 

      Nucleus

    • E. 

      Cytoskeleton

  • 19. 
    Covalent bonds joining two nucleotides within a single strand of DNA form between
    • A. 

      Deoxyribose and a phosphate group

    • B. 

      A phosphate group and adenine

    • C. 

      Ribose and a base

    • D. 

      The phosphate groups of both

    • E. 

      Adenine and thymine

  • 20. 
    DNA polymerase III adds nucleotides
    • A. 

      To internal sites in the DNA template

    • B. 

      In the place of the primer RNA after it is removed

    • C. 

      To both ends of the RNA primer

    • D. 

      To the 3' end of the RNA primer

    • E. 

      To the 5' end of the RNA primer

  • 21. 
    The term peptidyltransferase relates to
    • A. 

      Discontinuous strand replication

    • B. 

      Elongation factor binding to the large ribosomal unit

    • C. 

      5' capping of mRNA

    • D. 

      Peptide bond formation during protein synthesis

    • E. 

      Base additions during mRNA synthesis

  • 22. 
    A short segment of an mRNA molecule is shown below. The polypeptide it codes for is alson shown: 5'-AUGGUGCUGAAG : methionine-valine-leucine-lysine Assume that a mutation in the DNA occurs so that the fourth base (counting from the 5' end) of the messenger RNA now reads A rather than G. What sequence of amino acids will the mRNA now code for?
    • A. 

      Methionine-leucine-leucine-lysine

    • B. 

      Methionine-methionine-leucine-lysine

    • C. 

      Methionine-valine-methionine-lysine

    • D. 

      Methionine-lysin-leucine-lysine

    • E. 

      Methionine-valine-leucine-lysine

  • 23. 
    Triglycerides are
    • A. 

      Always composed of carbon rings

    • B. 

      Non-polar and hydrophobic

    • C. 

      Made from glycerol and nucleic acids

    • D. 

      Lacking carboxyl groups (-COOH)

    • E. 

      Polymers of amino acids

  • 24. 
    An intron is a section of
    • A. 

      Transfer RNA that binds to the anticodon

    • B. 

      RNA that is removed during RNA processing

    • C. 

      Carbohydrate that serves as a signal for RNA transport

    • D. 

      DNA that is removed during DNA processing

    • E. 

      Protein that is clipped out posttranslationally

  • 25. 
    GTP provides energy for
    • A. 

      Transcription

    • B. 

      Translation

    • C. 

      Protein folding

    • D. 

      DNA replication

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