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coldgirl [10]
4 years ago
13

How does DNA fold into a chromosome. What are the 6 steps

Biology
1 answer:
Xelga [282]4 years ago
3 0
<span>The essential unit of DNA packaging is the nucleosome. A nucleosome consists of a small amount of DNA wrapped up with protein. The proteins that interact with DNA to form chromatin comprise a family of basic (positively charged) proteins called histones. There are five different types of histone protein: H1, H2A, H2B, H3, and H4. Of these, two molecules each of H2A, H2B, H3, and H4 combine to form a histone octamer. DNA wraps around the octamer, making 1 3/4 turns around the protein complex. The amount of DNA associated with the histone octamer is 146 bp. The octamer plus the DNA comprise what is called the nucleosome core. A small stretch of DNA (60 bp) runs between adjacent nucleosome cores, and is known as the linker. A single nucleosome consists of one core plus a linker. The total amount of DNA involved in a single nucleosome is approximately 206 bp. Chromatin therefore consists of DNA wrapped around one histone octamer after another, like a long string of beads.</span>
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olchik [2.2K]

Answer:

Domains

Explanation:

All Biological organism can be classified or placed in a group.

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In taxonomy, a domain is the highest order of classification or ranking ,its even higher than the kingdoms.

It is inclusive of all biological grouping.

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5 0
3 years ago
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svetlana [45]
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8 0
3 years ago
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timofeeve [1]

Answer:

a. repressor

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Explanation:

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Those genes whose expression is under positive control will not be transcribed unless an activating protein is present which binds to a specific DNA sequence and helps RNA polymerase in the initial steps of transcription.

4 0
4 years ago
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vovikov84 [41]
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3 years ago
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