Final answer:
Plasmids are extra-chromosomal genetic elements found in bacteria that carry genes coding for advantageous enzymes or antibiotic resistance. Chromosomes contain the cell's genetic information in the form of double-stranded DNA molecules. Red blood cells, also known as erythrocytes, do not contain a nucleus or genetic material and their main function is to transport oxygen.
Step-by-step explanation:
Plasmids are extra-chromosomal genetic elements found in bacteria that carry genes coding for advantageous enzymes or antibiotic resistance. Chromosomes contain the cell's genetic information in the form of double-stranded DNA molecules. Red blood cells, also known as erythrocytes, do not contain a nucleus or genetic material and their main function is to transport oxygen.