IB Biology HL A1.2 Nucleic acids questions

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Question 1

Multiple choiceEasy1 mark

During molecular visualization of chromatin, a student selects a DNA–protein unit for closer study. Which arrangement in the model represents a nucleosome?

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Answer: C. A nucleosome has DNA wrapped around a core of eight histone proteins, with an additional histone attached to linker DNA.

A: uses seven histone proteins in the core instead of eight. B: places the additional histone on the core rather than on linker DNA. D: omits the additional histone attached to linker DNA.

Remember: distinguish the eight-protein core from the additional linker-associated histone.

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