Multiple Choice
Which organelle is primarily responsible for transporting materials within a eukaryotic cell?
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5. Cell Components
Introduction to Eukaryotic Organelles
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In the diagram of the nucleosome, which of the following components is directly wrapped by DNA?
A
Ribosomal RNA
B
Golgi apparatus
C
Histone octamer
D
Nuclear envelope
Verified step by step guidance1
Understand the structure of a nucleosome: A nucleosome is the basic unit of DNA packaging in eukaryotic cells. It consists of DNA wrapped around a core of histone proteins.
Identify the components of a nucleosome: The core of the nucleosome is made up of an octamer of histone proteins (two copies each of H2A, H2B, H3, and H4). DNA wraps around this histone octamer.
Eliminate incorrect options: Ribosomal RNA (rRNA) is involved in protein synthesis, not DNA packaging. The Golgi apparatus is an organelle involved in protein modification and transport, and the nuclear envelope surrounds the nucleus but is not part of the nucleosome.
Focus on the correct component: The histone octamer is the structure directly wrapped by DNA in the nucleosome. This interaction helps compact the DNA into chromatin.
Conclude: The correct answer is the histone octamer, as it is the protein complex around which DNA is directly wrapped in the nucleosome.
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