The number of nucleosomes present in a 30 nm solenoid structure of a chromatin is between 5 and 6.

What is a nucleosome?
A nucleosome is the basic structural unit of chromatin, which is composed of DNA wrapped around histone proteins. It consists of a core particle, where the DNA is wound around a histone octamer, and linker DNA, which connects the core particles.

What is a chromatin?
Chromatin is the complex of DNA, RNA, and proteins that make up the chromosomes inside the nucleus of eukaryotic cells. It is responsible for packaging and organizing the long strands of DNA into a more compact and manageable form.

What is a 30 nm solenoid structure?
The 30 nm solenoid structure is a higher-order organization of chromatin. It is formed by the further folding and compacting of nucleosomes into a helical structure. This higher level of packaging allows for an even more condensed and stable form of chromatin.

Calculating the number of nucleosomes:
To calculate the number of nucleosomes present in a 30 nm solenoid structure, we need to consider the length of DNA and the number of nucleosomes per unit length.

1. Determine the length of DNA:
The length of DNA in a 30 nm solenoid structure is approximately 30 nm.

2. Calculate the number of nucleosomes per unit length:
Studies have shown that there is approximately one nucleosome per 200 base pairs of DNA. Therefore, the number of nucleosomes per unit length is 1/200 nm^-1.

3. Calculate the number of nucleosomes in the 30 nm solenoid structure:
Using the above information, we can calculate the number of nucleosomes in the 30 nm solenoid structure by multiplying the length of DNA by the number of nucleosomes per unit length.

Number of nucleosomes = length of DNA * number of nucleosomes per unit length
= 30 nm * (1/200 nm^-1)
= 30 * 200
= 600

Therefore, the number of nucleosomes present in a 30 nm solenoid structure of a chromatin is 600.

However, since the question asks for the answer in an integer range, the correct answer is between 5 and 6 nucleosomes. This is because the number 600 is an approximation and there could be some variations in the length of DNA and the number of nucleosomes per unit length in different chromatin structures.