Chapter 18-19

Last update by mayurcooled on 04/23/2014
529094 People have viewed this Quiz
  • Share

A bacterium can make the amino acid glycine or absorb it from its surroundings. A biochemist finds that glycine binds to a repressor protein and causes the repressor to bind to the bacterial chromosome, turning off an operon. If it is like other similar operons, the presence of glycine will result in the _____. ( Concept 18.1)


a.inhibition of bacterial cell division

b.formation of sex pili

c.cessation of the synthesis of glycine

d.production of the repressor protein

e.breakdown of glycine

Answer:
c.cessation of the synthesis of glycine

View Chapter 18-19 as Flashcard Deck

Related Quiz Content
  • smiraclelynch
    Answered in Chapter 18-19
    In general, operons that encode the enzymes of a biosynthetic (anabolic) pathway (such as the trp operon) are _____, and those encoding the enzymes of a catabolic pathway (such as the lac operon) are _____. ( Concept 18.1)


    a.repressible ... inducible

    b.inducible ... repressible

    c.easily mutated ... resistant to mutations

    d.permanently off ... permanently on

    e.permanently on ... permanently off
    a.repressible ... inducible
  • smiraclelynch
    Answered in Chapter 18-19
    In general, operons that encode the enzymes of a biosynthetic (anabolic) pathway (such as the trp operon) are _____, and those encoding the enzymes of a catabolic pathway (such as the lac operon) are _____. ( Concept 18.1)


    a.repressible ... inducible

    b.inducible ... repressible

    c.easily mutated ... resistant to mutations

    d.permanently off ... permanently on

    e.permanently on ... permanently off
    a.repressible ... inducible
  • smiraclelynch
    Answered in Chapter 18-19
    In an inducible operon, the inducer is often the _____ in the pathway being regulated; the inducer binds to the _____, thus rendering it _____. ( Concept 18.1)


    a.substrate ... corepressor ... inactive

    b.end product ... repressor ... inactive

    c.substrate ... repressor ... inactive

    d.end product ... corepressor ... inactive

    e.substrate ... repressor ... active
    c.substrate ... repressor ... inactive
  • smiraclelynch
    Answered in Chapter 18-19
    You have inserted the gene for human growth factor into the E. coli lactose operon, replacing the structural genes with the gene for human growth factor. What substance must you add to your culture of bacteria to cause them to produce human growth factor for you? ( Concept 18.1)


    a.allolactose

    b.human growth factor

    c.transcription factors

    d.operator protein

    e.repressor protein

    a.allolactose
  • smiraclelynch
    Answered in Chapter 18-19
    Both repressible and inducible operons control gene expression at the level of _____. (Concept 18.1)


    DNA packing

    translation

    post-transcriptional processing

    post-translational processing

    transcription
    transcription
  • smiraclelynch
    Answered in Chapter 18-19
    Gene expression in bacteria is regulated primarily by _____. (Concept 18.1)


    controlling the translation of mRNA into protein

    transcription factors encoded for by mitochondrial DNA

    selectively breaking down the proteins encoded by the genes

    controlling the transcription of genes into mRNA

    controlling gene packing and unpacking

    controlling the transcription of genes into mRNA
  • smiraclelynch
    Answered in Chapter 18-19
    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

    in a multicellular eukaryote, different cells are specialized for different functions
  • smiraclelynch
    Answered in Chapter 18-19
    In some cases DNA methylation and histone deacetylation combine to _____. (Concept 18.2)


    remove genomic imprinting

    silence certain genes

    form a transcription factor

    turn certain genes on

    form an enhancer
    silence certain genes
  • smiraclelynch
    Answered in Chapter 18-19
    In eukaryotes, DNA packing seems to affect gene expression primarily by _____. (Concept 18.2)


    allowing unpacked genes to be eliminated from the genome

    controlling access to DNA

    positioning related genes near each other

    protecting DNA from mutations

    enhancing the recombination of genes

    controlling access to DNA
  • smiraclelynch
    Answered in Chapter 18-19
    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
    Answered in Chapter 18-19
    In a eukaryote, activating transcription factors may stimulate gene expression by binding to a DNA site called a(n) _____. ( Concept 18.2)


    operon

    histone

    enhancer

    silencer

    promoter
    enhancer