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Unraveling the DNA Packaging Mystery

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Questions and Answers

What type of proteins are responsible for tightly packing linear DNA fibers?

Transcription factors
Histones (correct)
Receptors
Enzymes

What is the first step in the formation of a nucleosome?

Wrapping of DNA around histone proteins
Separation of linker DNA
Binding of histone H1
Formation of an octamer protein complex (correct)

How many times is the DNA wrapped around the histone proteins in a nucleosome?

Three times
Once
Four times
Twice (correct)

What is the name given to the complex of histone proteins and DNA wrapping around them?

Nucleosome (B) Signup and view all the answers

What is the length of the linker DNA that separates nucleosomes?

30-bp (A) Signup and view all the answers

What is the role of histone H1 in the formation of nucleosomes?

To prevent nucleosomes from becoming tangled (A) Signup and view all the answers

What is the final structure formed by the coiling of loop structures?

Sister chromatid (A) Signup and view all the answers

Which histone protein is not part of the octamer protein complex in nucleosomes?

H1 (B) Signup and view all the answers

What is the function of histone proteins in DNA packaging?

To tightly pack the DNA (A) Signup and view all the answers

What is the size of the octamer protein complex in nucleosomes?

8 proteins (B) Signup and view all the answers

What is the name given to the DNA-protein complex that makes up chromosomes?

Chromatin (D) Signup and view all the answers

What is the role of histone proteins in gene expression?

To silence gene expression (D) Signup and view all the answers