In mitosis, the phase wherein the chromosome contains a
single DNA is at metaphase. The original chromosome and its copy join together
forming as chromatids. After the formation of chromatid, this then separate
during metaphase. The separated chromatid each contains a single DNA molecule.
The answer is the mitochondria. They have their own DNA unlike other organelles.
The cell membrane is also called selectively permeable membrane for the sole reason being it is selective in nature.
It forms a physical barrier and as a barrier between the cell and the external environment as it allows only selected necessary molecules to pass through it and at the same time prevents entry of unwanted / unnecessary substances.
It also regulates the entry and exit of molecules into and out of the cell.
The cell membrane permits the entry of vital molecules like
<span>water, oxygen, amino acids and glucose into the cell as they are crucial for various life processes and at the same time metabolic waste products are expelled through the cell membrane.</span>
What was c? But I think its A.) a molecule that changes state.
