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In prokaryotic organisms like bacteria, what is true about the structure of their chromosomes?

1. Bacteria possess exclusively circular chromosomes.
2. A plasmid is a small, circular DNA molecule that replicates independently and typically contains a limited number of genes. Its quantity in a cell remains stable through generations.
3. Plasmids are extra-chromosomal DNA molecules that can function independently but may integrate into the bacterial chromosome, becoming a permanent part of it.
4. Genetically engineered plants, also known as transgenic crops, are created using microorganisms like bacteria and viruses. Consuming such crops may introduce viruses and toxins, potentially causing allergies and health issues in humans.

Correct answer: Bacteria possess exclusively circular chromosomes.

Solution

Bacteria are classically described as having a single circular chromosome, unlike eukaryotes which have linear chromosomes. Plasmids are separate DNA molecules, so the statement about bacteria’s chromosome structure is the correct one.

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