Chromatin Structure and Cell Cycle
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Questions and Answers

What is the term for the DNA-protein complex that is highly conserved in all eukaryotes?

  • Histone
  • Nucleosome
  • Sister chromatid
  • Chromatin (correct)

What is the primary function of histones in chromatin formation?

  • To condense DNA and prepare it for further condensation (correct)
  • To replicate DNA during the S phase
  • To transcribe DNA into RNA
  • To translate RNA into proteins

What is the approximate length of DNA in humans?

  • 3m/9.8ft
  • 4m/13.1ft
  • 1m/3.3ft
  • 2m/6.5ft (correct)

Which type of proteins are involved in the physical structure of the chromosome, in addition to histones?

<p>Non-histone proteins (D)</p> Signup and view all the answers

What is the net charge of histone proteins?

<p>Positive (+ve) (B)</p> Signup and view all the answers

What is the stage of the cell cycle in which chromosomes duplicate into sister chromatids?

<p>S (C)</p> Signup and view all the answers

What is the function of non-histone proteins in chromatin formation?

<p>They possess a net negative charge and bind to histones. (B)</p> Signup and view all the answers

What is the diameter of the nucleosome core in chromatin formation?

<p>11 nm (A)</p> Signup and view all the answers

How does the protein H1 contribute to chromatin formation?

<p>It condenses DNA into chromatin with a diameter of 30 nm. (D)</p> Signup and view all the answers

What is the name of the regions where non-histone proteins bind to form loops in chromatin structure?

<p>SARs (scaffold-associated regions) (C)</p> Signup and view all the answers

What is the ratio of the length of fully condensed chromosome to the length of DNA alone?

<p>10,000:1 (A)</p> Signup and view all the answers

How many nucleosomes are present in each loop of DNA in chromatin structure?

<p>180-300 (B)</p> Signup and view all the answers

During which stage of the cell cycle is chromatin most condensed?

<p>Metaphase (D)</p> Signup and view all the answers

What type of proteins forms the scaffold for additional chromatin condensation during mitosis and meiosis?

<p>Non-histone proteins (D)</p> Signup and view all the answers

Which type of chromatin is actively transcribed and lacks repetitive sequences?

<p>Euchromatin (A)</p> Signup and view all the answers

What is the function of centromeres during mitosis and meiosis?

<p>To attach spindle fibers (D)</p> Signup and view all the answers

Which type of heterochromatin varies between cell types or developmental stages?

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

What is the primary function of yeast (Saccharomyces cerevisiae) centromeres?

<p>To attach spindle fibers (B)</p> Signup and view all the answers

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