Chapter 18-19

Last update by mayurcooled on 04/23/2014
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The expression of a gene located in a tightly coiled region of DNA can be promoted by _____. ( Concept 18.2)


histone deacetylation

the arrival of the RNA polymerase

histone acetylation

methylation of histone tails

demethylation of DNA

Answer:
histone acetylation

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Related Quiz Content
  • smiraclelynch
    Answered in Chapter 18-19
    Which of the following statements is NOT associated with epigenetic inheritance?( Concept 18.2)


    DNA methylation

    chemical mutagens

    histone deacetylation

    DNA phosphorylation

    histone acetylation
    chemical mutagens
  • smiraclelynch
    Answered in Chapter 18-19
    A high rate of gene transcription in eukaryotic cells is usually dependent on _____. (Concept 18.2)


    the binding of general transcription factors to the TATA box within the promoter of a gene

    the coordinated control of genes within operons

    specific binding of activator molecules to enhancers

    protein-protein interactions that are promoted by the activation domains of activator proteins

    The third and fourth listed responses are correct.
    The third and fourth listed responses are correct.
  • smiraclelynch
    Answered in Chapter 18-19
    Which of the following best depicts coordinate control of genes in eukaryotes?(Concept 18.2)


    Different genes for proteins involved in a specific metabolic process typically share the same enhancer regions.

    Although a group of genes involved in a related metabolic process are typically scattered over different chromosomes, their co-activation is achieved by every gene of the group sharing a specific combination of control elements and activator molecules that bind to them.

    Although a group of genes involved in a related metabolic process are typically scattered over different chromosomes, coordinated expression of this group is enhanced by the congregation of loops from different chromosomes in a specific site of the nucleus to form a transcription factory.

    The first and second listed responses are correct.

    The second and third listed responses are correct.




    The second and third listed responses are correct.
  • smiraclelynch
    Answered in Chapter 18-19
    Although the number of genes in the human genome is surprisingly low compared to less complex organisms, the number of possible products from those genes is greatly amplified by _____. ( Concept 18.2)


    differential activation of genes in different cell types

    the congregation in specific sites in the nucleus of genes involved in related metabolic processes, but on different chromosomes

    alternate arrangements of exons from a primary transcript

    coordinate control of genes on different chromosomes

    each gene being activated by a unique combination of control elements and activator molecules


    alternate arrangements of exons from a primary transcript
  • smiraclelynch
    Answered in Chapter 18-19
    Which of the following best describes the makeup of the human genome? ( Concept 18.3)


    Most of the genome consists of protein-coding DNA.

    The amount of DNA that consists of genes for ribosomal RNA and transfer RNA is slightly greater than the protein-coding DNA.

    Genes for noncoding RNA make up the majority of meaningful genetic information in the human genome.

    Most of the genome does not contain meaningful genetic information and is not transcribed.

    None of the listed responses is correct.

    Genes for noncoding RNA make up the majority of meaningful genetic information in the human genome.
  • smiraclelynch
    Answered in Chapter 18-19
    The discovery of many noncoding RNAs is causing scientists to revise the long-held view that _____. ( Concept 18.3)


    there are only three types of RNA—tRNA, rRNA, and mRNA

    only DNA that codes for protein, tRNA, and rRNA is transcribed

    the vast majority of the human genome consists of "junk" DNA

    all genes code for proteins

    All of the listed responses are correct.

    All of the listed responses are correct.
  • smiraclelynch
    Answered in Chapter 18-19
    MicroRNAs and small interfering RNAs both function similarly in "silencing" genes. What are two ways in which they may act? (Concept 18.3)


    cut up mRNAs using the Dicer enzyme and bind to complementary DNA sequences to prevent transcription

    cut up mRNAs using the Dicer enzyme and bind to complementary mRNA sequences to prevent translation

    degrade mRNA and bind to complementary mRNA sequences to prevent translation

    degrade mRNA and inhibit RNA splicing

    inhibit RNA splicing and bind to complementary DNA sequences to prevent transcription
    degrade mRNA and bind to complementary mRNA sequences to prevent translation
  • smiraclelynch
    Answered in Chapter 18-19
    It is hypothesized that an increase in the number and diversity of noncoding RNA (ncRNA) in the genomes of species has driven the evolution of morphological complexity by way of their influence on gene regulation. Which of the following accurately describes our current understanding of the role that ncRNA is thought to play in gene regulation?( Concept 18.3)


    ncRNAs can re-establish proper patterns of DNA methylation in the genome during gamete formation.

    ncRNAs can fine-tune translation by binding with mRNA via complementary base pairing and promote the degradation of the mRNA strand or block its translation.

    Whereas some ncRNA block the transcription and translation of some genes, others have been observed to activate gene expression.

    Some ncRNA can promote the formation of heterochromatin, thereby blocking the expression of genes in the tightly coiled region.

    All of the listed responses are correct.

    All of the listed responses are correct.
  • smiraclelynch
    Answered in Chapter 18-19
    Specific cells that appear undifferentiated under the microscope but are already fated to become muscle cells are called _____. ( Concept 18.4)


    muscle cells

    meristematic cells

    myoblasts

    myocytes

    bicoids
    myoblasts
  • smiraclelynch
    Answered in Chapter 18-19
    MyoD promotes muscle cell development by _____. ( Concept 18.4)


    turning on the expression of multiple muscle-related genes

    stimulating a receptor on the surface of muscle cells, thus activating a signal-transduction pathway that promotes muscle development

    stimulating the production of muscle-specific splicing variants of certain mRNAs

    enhancing apoptosis of non-muscle cells

    increasing the translation of muscle-related genes




    turning on the expression of multiple muscle-related genes