Practice Exam For Cell Biology

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Biology Quizzes & Trivia
Comprehensive Practice Exam for Cell Biology Students

  
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  • 1. 
    • A. 

      They have no nucleus and hence no DNA

    • B. 

      They have no Golgi apparatus

    • C. 

      They include bacteria, yeast, and protozoans

    • D. 

      They are all able to live on inorganic energy sources

    • E. 

      Both (b) and (c) are correct


  • 2. 
    The α helix and β sheet are found in many different proteins because they are formed by
    • A. 

      Hydrogen bonding between the amino acid side chains most commonly found in proteins

    • B. 

      Noncovalent interactions between amino acid side chains and the polypeptide backbone

    • C. 

      Ionic interactions between charged amino acid side chains

    • D. 

      Hydrogen bonding between atoms of the polypeptide backbone

    • E. 

      Hydrophobic interactions between the many nonpolar amino acids


  • 3. 
    • A. 

      Have conserved amino acid sequences

    • B. 

      Have conserved secondary structures

    • C. 

      Have similar functions

    • D. 

      Have conserved tertiary structures

    • E. 

      All of the above


  • 4. 
    Enzymes catalyze a chemical reaction by __________ the activation energy, because they provide conditions favorable for the formation of a __________ intermediate called the __________ .
    • A. 

      Lowering; high-energy; transition state

    • B. 

      Increasing; high-energy; transition state

    • C. 

      Lowering; low-energy; transition state

    • D. 

      Increasing; low-energy; alternative state

    • E. 

      Lowering; high-energy; alternative state


  • 5. 
    RNA in cells differ from DNA in that
    • A. 

      It contains the base uracil, which preferentially pairs with cytosine.

    • B. 

      It is single-stranded and cannot form base pairs.

    • C. 

      It is single stranded can can fold up into a variety of structures.

    • D. 

      The nucleotides are linked together in different way

    • E. 

      The sugar ribose contains fewer oxygen atoms than does deoxyribose


  • 6. 
    Which of the following statements about the genetic code are correct?
    • A. 

      One codon specifies more than one amino acid

    • B. 

      The genetic code consists of 64 codons

    • C. 

      All amino acids are specified by more than one codon

    • D. 

      The genetic code is different in prokaryotes and eukaryotes

    • E. 

      All codons specify an amino acid


  • 7. 
    KM is a measure of
    • A. 

      Substrate affinity of an enzyme

    • B. 

      Enzyme performance

    • C. 

      Catalytic rate of an enzyme

    • D. 

      Ratio of [enzyme-substrate complex] to[unbound enzyme][unbound substrate]

    • E. 

      Rate of enzyme degradation


  • 8. 
    What is an example of a GTP-binding protein?
    • A. 

      Lysozyme

    • B. 

      Ef-Tu

    • C. 

      Myosin head

    • D. 

      M-phase promoting factor (MPF)

    • E. 

      Hemoglobin


  • 9. 
    What are ways in which proteins can be regulated?
    • A. 

      Allosteric regulation

    • B. 

      Feedback regulation

    • C. 

      GTP-binding

    • D. 

      ATP-binding

    • E. 

      All of the above


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