Chapter 18-19

Last update by mayurcooled on 04/23/2014
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The control of gene expression is more complex in multicellular eukaryotes than in prokaryotes because _____. ( Concept 18.2)


eukaryotic cells are much smaller

prokaryotes are restricted to stable environments

in a multicellular eukaryote, different cells are specialized for different functions

eukaryotic chromosomes have fewer nucleotides; therefore, each nucleotide sequence must do several jobs

the genes of eukaryotes provide information for making proteins

Answer:
in a multicellular eukaryote, different cells are specialized for different functions

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    A scientist clones a regulatory gene that is involved in controlling the expression of other genes, and discovers that the regulatory gene encodes a histone deacetylase enzyme. It is likely that this enzyme regulates gene expression by _____. ( Concept 18.2)


    causing tighter packing of the chromatin at the target gene, thereby inhibiting transcription

    causing looser packing of the chromatin at the target gene, thereby enhancing transcription

    causing tighter packing of the chromatin at the target gene, thereby enhancing transcription

    causing looser packing of the chromatin at the target gene, thereby inhibiting transcription

    causing tighter packing of the chromatin at the target gene, thereby inhibiting translation
    causing tighter packing of the chromatin at the target gene, thereby inhibiting transcription
  • smiraclelynch
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    In a eukaryote, activating transcription factors may stimulate gene expression by binding to a DNA site called a(n) _____. ( Concept 18.2)


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    Enhancers _____. ( Concept 18.2)


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    Dioxin, produced as a by-product of various industrial chemical processes, is suspected of causing cancer and birth defects in animals and humans. It apparently acts by entering cells and binding to specific proteins, which then enter the nucleus and alter the pattern of gene expression. Therefore, dioxin acts by mimicking the action of _____. ( Concept 18.2)


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    Post-transcriptional controls _____. ( Concept 18.2)


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    Which of the following is a means of controlling eukaryotic gene expression? ( Concept 18.2)


    mRNA processing

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    Because it is not specific to a cell type, alternative RNA splicing can make sweeping changes in gene expression, allowing an organism to adapt quickly to new situations.

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    It expands the number of proteins that can be coded for by one gene, increasing an organism's ability to produce novel proteins.
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