Which statement is not true about prokaryotic cells? They are always single-celled organisms, and they never contain mitochondri
a. They have a circular loop of DNA instead of multiple linear DNA molecules. They lack a nucleus, but they do have ribosomes. They may have flagella, but they never have cilia. They all have a rigid cell wall instead of a plasma membrane.
Prokaryotes are unicellular organisms that lack organelles or other internal membrane-bound structures. Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double-stranded DNA located in an area of the cell called the nucleoid.
cancer results not from a single flawed gene, but rather the interplay of multiple genes and any accumulated damage to DNA caused by environmental factors such as exposure to chemicals, or aspects of lifestyle, such as smoking
