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11Alexandr11 [23.1K]
3 years ago
11

Describe how DNA is coiled and eventually supercoiled to condense it into chromosomes.

Biology
1 answer:
Solnce55 [7]3 years ago
8 0

Double-stranded DNA loops around 8 histones twice, forming the nucleosome, which is the building block of chromatin packaging. DNA can be further packaged by forming coils of nucleosomes, called chromatin fibers. These fibers are condensed into chromosomes during mitosis, or the process of cell division.

Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.

During DNA packaging, long pieces of double-stranded DNA are tightly looped, coiled, super coiled, and folded so that they fit easily within the cell.  This highly compacted DNA is then arranged into structures called chromosomes.


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The lac operon of E. coli contains genes involved in lactose metabolism. It's expressed only when lactose is present and glucose is absent.

<h3>How is the lac operon triggered by E. coli?</h3>

The lac operon of E. coli contains genes related to lactose metabolism. Only when lactose and glucose levels are low does it manifest symptoms. Two regulators that control the operon's "on" and "off" states in response to lactose and glucose concentrations are lac repressor and catabolite activator protein (CAP).

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Because it promotes quicker development than other sugars and is the first sugar to be consumed in sugar combinations, glucose is frequently the best carbon source for E. coli.

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