Prokaryotic cell DNA is a single molecule, found free in the cytoplasm; additional DNA is found on one or more rings called plasmids.

Dead cells are joined end to end to form a continuous tube. They have no cytoplasm. Their walls contain lignin for strengthening. Phloem cell They transport sugars, amino acids, other substances ...

Opportunistic fungal pathogens may cause superficial or serious invasive infections, especially in immunocompromised and debilitated patients. Invasive mycoses represent an exponentially growing ...