Biology

9th -

12thgrade

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Unit 4A Exam Review

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  • 1. Multiple Choice
    2 minutes
    1 pt

    In 1944 Avery, MacLeod, and McCarty performed transformation experiments using live, harmless bacteria and extracts from virulent bacteria treated with various enzymes. Which of the following enzymes were used and why?

    Proteases and RNases to rule out protein and RNA as the transforming factors

    Lipase (an enzyme that facilitates the breakdown of lipids) to rule out lipoproteins as the transforming factor

    Kinase (an enzyme that facilitates transfer of a phosphate group from ATP to a substrate molecule) to show that transformation is phosphorylation dependent

    ATPase to show that transformation is not dependent on ATP

  • 2. Multiple Choice
    2 minutes
    1 pt
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    A student in a biology class crossed a male Drosophila melanogaster having a gray body and long wings with a female D. melanogaster having a black body and apterous wings. The following distribution of traits was observed in the offspring.


    Which of the following is supported by the data?

    The alleles for gray body and long wings are dominant.

    The alleles for gray body and long wings are recessive.

    Genes for the two traits are located on two different chromosomes, and independent assortment occurred.

    Genes for the two traits are located close together on the same chromosome, and crossing over occurred between the two gene loci.

  • 3. Multiple Choice
    2 minutes
    1 pt

    If chemical signals in the cytoplasm control the progression of a cell to the M phase of the cell cycle, then fusion of a cell in G1 with a cell in early M phase would most likely result in the

    replication of chromosomes only in the G1 cell

    exiting of both cells from the cell cycle and into the G0 phase

    condensation of chromatin in preparation of nuclear division in both cells

    transfer of organelles from the G1 cell to the cell in the M phase

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