Differential Gene Expression and Chromatin Structure

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Questions and Answers

What is the phenomenon called when only one X chromosome is functioning in a mammalian somatic cell?

  • X chromosome duplication
  • X chromosome mutation
  • X chromosome inactivation (correct)
  • X chromosome activation

What is the structure of the inactive X chromosome during most of the cell cycle?

  • Chromoplast
  • Heterochromatin (correct)
  • Euchromatin
  • Centromere

What is the mechanism that converges in inactivating an X chromosome across mammalian groups?

  • Demethylation of promoters
  • Transcription of genes
  • Methylation of promoters (correct)
  • Replication of chromosomes

What is the name of the locus on the X chromosome that is transcribed on the inactive X chromosome?

<p>XIST (B)</p> Signup and view all the answers

What happens to the promoter regions of genes on the inactive X chromosome in humans?

<p>They are methylated (A)</p> Signup and view all the answers

What is the product of the XIST locus gene?

<p>An untranslated RNA molecule (D)</p> Signup and view all the answers

When does the inactive X chromosome replicate in the cell cycle?

<p>Later than most chromatin (D)</p> Signup and view all the answers

What is the result of X chromosome inactivation in mammalian somatic cells?

<p>One functioning X chromosome (B)</p> Signup and view all the answers

What is the significance of XIST RNA coating the inactive X chromosome?

<p>It remodels the chromatin (A)</p> Signup and view all the answers

Which of the following is a characteristic of the inactive X chromosome?

<p>It is highly condensed (A)</p> Signup and view all the answers

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