Biology Practice Exam Quiz MCQ!

15 Questions | Total Attempts: 487

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Biology Practice Exam Quiz MCQ!

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Questions and Answers
  • 1. 
    Chromatids are
    • A. 

      Dense patches within the nucleus

    • B. 

      Bacterial chromosomes

    • C. 

      Duplicate halves of a chromosome

    • D. 

      Prokaryotic nuclei

  • 2. 
    Which is the correct sequence of the cell cycle?
    • A. 

      C -> M -> G1 -> S -> G2

    • B. 

      S -> G1 -> G2 -> M -> C

    • C. 

      G1 -> S -> G2 -> M -> C

    • D. 

      None

  • 3. 
    Chromosomes are only visible in what stage?
    • A. 

      M phase (meiosis)

    • B. 

      G1

    • C. 

      G2

    • D. 

      C phase

    • E. 

      S phase (DNA synthesis)

  • 4. 
    Crossing-over occurs during:
    • A. 

      Mitosis

    • B. 

      Prophase I of meiosis

    • C. 

      Metaphase I of meiosis

    • D. 

      None

  • 5. 
    Crossing-over is also known as:
    • A. 

      Synapsis

    • B. 

      Chiasmata

  • 6. 
    Synapsis is:
    • A. 

      Crossing-over

    • B. 

      The lining up of chromosomes

    • C. 

      Chromosomes lying close together

  • 7. 
    In what phase do tetrads form?
    • A. 

      Anaphase I

    • B. 

      Metaphase I

    • C. 

      Prophase I

    • D. 

      Metaphase II

    • E. 

      Prophase II

  • 8. 
    The cell cycle is
    • A. 

      Series of events that cells go through as they grow and divide

    • B. 

      Period of time between the birth and death of a cell

    • C. 

      Time from prophase until cytokinesis

    • D. 

      Time is takes for a cell to undergo mitosis

  • 9. 
    What is the role of the spindle during mitosis?
    • A. 

      It helps separate the chromosomes

    • B. 

      It breaks down the nuclear membrane

    • C. 

      It duplicates the DNA

    • D. 

      It divides the cell in half

  • 10. 
    Unlike mitosis, meiosis results in the formation of:
    • A. 

      2 genetically identical cells

    • B. 

      4 genetically identical cells

    • C. 

      2 genetically different cells

    • D. 

      4 genetically different cells

  • 11. 
    Genetic drift tends to occur in populations that are:
    • A. 

      Small

    • B. 

      Large

  • 12. 
    During transcription:
    • A. 

      Proteins are synthesized

    • B. 

      DNA is replicated

    • C. 

      RNA is produced

    • D. 

      Translation occurs

  • 13. 
    What type of gene codes for a repressor protein?
    • A. 

      Regulator

    • B. 

      Promoter

    • C. 

      Operon

    • D. 

      Enhancer

  • 14. 
    Which enzyme's action is prevented by the presence of a repressor protein?
    • A. 

      DNA polymerase

    • B. 

      RNA polymerase

    • C. 

      Lactase

    • D. 

      Permease

  • 15. 
    The lac operon shuts off when:
    • A. 

      Lactose is present

    • B. 

      Lactose is absent

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