Chapter 18-19

Last update by mayurcooled on 04/23/2014
525430 People have viewed this Quiz
  • Share

In eukaryotes, transcription is generally associated with



A. euchromatin only. B. very tightly packed DNA only. C. heterochromatin only. D. both euchromatin and histone acetylation.
E. highly methylated DNA only.

Answer:
D. both euchromatin and histone acetylation.

View Chapter 18-19 as Flashcard Deck

Related Quiz Content
  • smiraclelynch
    Answered in Chapter 18-19
    During DNA replication,



    A. methylation of the DNA is maintained because DNA polymerase directly incorporates methylated nucleotides into the new strand opposite any methylated nucleotides in the template. B. all methylation of the DNA is lost at the first round of replication. C. DNA polymerase is blocked by methyl groups, and methylated regions of the genome are therefore left uncopied. D. methylation of the DNA is maintained because methylation enzymes act at DNA sites where one strand is already methylated and thus correctly methylates daughter strands after replication.
    E. methylated DNA is copied in the cytoplasm, and unmethylated DNA in the nucleus.
    D. methylation of the DNA is maintained because methylation enzymes act at DNA sites where one strand is already methylated and thus correctly methylates daughter strands after replication.
  • smiraclelynch
    Answered in Chapter 18-19
    Steroid hormones produce their effects in cells by



    A. promoting the degradation of specific mRNAs. B. binding to intracellular receptors and promoting transcription of specific genes.
    C. activating key enzymes in metabolic pathways. D. promoting the formation of looped domains in certain regions of DNA. E. activating translation of certain mRNAs.
    B. binding to intracellular receptors and promoting transcription of specific genes.
  • smiraclelynch
    Answered in Chapter 18-19
    Gene expression might be altered at the level of post-transcriptional processing in eukaryotes rather than prokaryotes because of which of the following?



    A. Eukaryotic mRNAs get 5' caps and 3' tails. B. Eukaryotic exons may be spliced in alternative patterns.
    C. Eukaryotic coded polypeptides often require cleaving of signal sequences before localization. D. Prokaryotic genes are expressed as mRNA, which is more stable in the cell. E. Prokaryotes use ribosomes of different structure and size.
    B. Eukaryotic exons may be spliced in alternative patterns.
  • smiraclelynch
    Answered in Chapter 18-19
    Which of the following is most likely to have a small protein called ubiquitin attached to it?



    A. a regulatory protein that requires sugar residues to be attached B. an mRNA produced by an egg cell that will be retained until after fertilization C. a cyclin that usually acts in G1, now that the cell is in G2
    D. a cell surface protein that requires transport from the ER E. an mRNA that is leaving the nucleus to be translated
    C. a cyclin that usually acts in G1, now that the cell is in G2
  • smiraclelynch
    Answered in Chapter 18-19
    Which of the following best describes siRNA?



    A. a single-stranded RNA that can, where it has internal complementary base pairs, fold into cloverleaf patterns B. a portion of rRNA that allows it to bind to several ribosomal proteins in forming large or small subunits C. a short double-stranded RNA, one of whose strands can complement and inactivate a sequence of mRNA
    D. a molecule, known as Dicer, that can degrade other mRNA sequences E. a double-stranded RNA that is formed by cleavage of hairpin loops in a larger precursor
    C. a short double-stranded RNA, one of whose strands can complement and inactivate a sequence of mRNA
  • smiraclelynch
    Answered in Chapter 18-19
    The fact that plants can be cloned from somatic cells demonstrates that



    A. genes are lost during differentiation. B. differentiated cells retain all the genes of the zygote.
    C. differentiated cells contain masked mRNA. D. differentiation does not occur in plants. E. the differentiated state is normally very unstable.
    B. differentiated cells retain all the genes of the zygote.
  • smiraclelynch
    Answered in Chapter 18-19
    Which of the following serve as sources of developmental information?



    A. paternally deposited proteins B. ubiquitous enzymes such as DNA polymerase and DNA ligase C. signal molecules produced by the maturing zygote D. specific operons within the zygote genome E. cytoplasmic determinants such as mRNAs and proteins produced before fertilization
    E. cytoplasmic determinants such as mRNAs and proteins produced before fertilization
  • smiraclelynch
    Answered in Chapter 18-19
    Mutations in these genes lead to transformations in the identity of entire body parts:



    A. segmentation genes B. morphogens C. inducers D. egg-polarity genes E. homeotic genes
    E. homeotic genes
  • smiraclelynch
    Answered in Chapter 18-19
    These genes are expressed by the mother, and their products are deposited into the developing egg:



    A. inducers B. morphogens C. homeotic genes D. egg-polarity genes
    E. segmentation gene
    D. egg-polarity genes
  • smiraclelynch
    Answered in Chapter 18-19
    These genes form gradients and help establish the axes and other features of an embryo:



    A. inducers B. morphogens
    C. segmentation genes D. homeotic genes E. egg-polarity genes
    B. morphogens