Multiple Choice
Which type of eukaryotic cell is primarily responsible for picking up oxygen in the lungs and transporting it to tissues throughout the body?
5. Cell Components
Introduction to Eukaryotic Organelles
Multiple Choice
Which of the following best describes a nucleosome?
A
A segment of DNA wrapped around a core of histone proteins
B
A double-membraned structure that contains the cell's genetic material
C
A membrane-bound organelle responsible for protein synthesis
D
A vesicle involved in the breakdown of cellular waste
Verified step by step guidance1
Understand the term 'nucleosome': A nucleosome is a structural unit of chromatin in eukaryotic cells, consisting of DNA wrapped around histone proteins.
Recall the role of histone proteins: Histones are positively charged proteins that help package negatively charged DNA into a compact structure, enabling efficient storage within the nucleus.
Visualize the structure: A nucleosome consists of approximately 147 base pairs of DNA wrapped around a core of eight histone proteins (two each of H2A, H2B, H3, and H4). This structure resembles 'beads on a string' when viewed under a microscope.
Eliminate incorrect options: The other options describe unrelated cellular structures or functions, such as double-membraned organelles (e.g., nucleus), protein synthesis (e.g., ribosomes), and waste breakdown (e.g., lysosomes).
Conclude that the correct description of a nucleosome is 'A segment of DNA wrapped around a core of histone proteins,' as this matches the biological definition and structure of a nucleosome.
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