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Structures called beads on string are...

Structures called beads on string are

A

Nucleosomes

B

Base pairs

C

Genes

D

Nucleotides.

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the structures referred to as "beads on a string". This is a common term used in biology to describe a specific arrangement of DNA and proteins. 2. **Identifying the Options**: The options provided are: - Nucleosomes - Base pairs - Genes - Nucleotides 3. **Analyzing Each Option**: - **Nucleosomes**: These are the fundamental units of DNA packaging. They consist of a segment of DNA wrapped around a core of histone proteins. - **Base pairs**: These refer to pairs of nitrogenous bases that form the rungs of the DNA ladder, not structures that resemble beads on a string. - **Genes**: These are segments of DNA that code for proteins, but they do not have a bead-like structure. - **Nucleotides**: These are the building blocks of DNA and RNA, consisting of a sugar, phosphate group, and a nitrogenous base, but they do not form a bead-like structure. 4. **Conclusion**: The correct answer is **Nucleosomes**, as they are specifically described as "beads on a string" due to their structure of DNA wrapped around histone proteins. 5. **Final Answer**: The structures called beads on a string are **Nucleosomes**. ---
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