Some Single-Celled Organisms Live Inside Other Cells, Lack Many of the Organelles

question 97

Multiple Choice

Some single-celled organisms live inside other cells, lack many of the organelles that most eukaryotes have, and have a relatively small number of genes in their genomes. Which of the following is TRUE of these single-celled organisms?

• A)They have a streamlined simplicity that is possible because they rely on their hosts for many cell functions.
• B)They are primitive cells compared to the cells in which they live.
• C)They represent a fourth category of cells that exists in addition to archaea, bacteria, and eukaryotic cells.
• D)They are all parasitic cells.