Question

what is plasma membrane?
what is chromosomes?
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Answer 1

The cell membrane is also called the plasma membrane. It provides protection for the cell and its cellular components from the external environment. It is selectively permeable and regulates the movement of molecules in and out of the cell.

In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure. ... Chromosomes are made of many chromatin threads, each containing DNA and proteins.

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