All protists have ____.

A) chloroplasts only
B) nuclei only
C) mitochondria only
D) both nuclei and mitochondria
E) chloroplasts, nuclei, and mitochondria

Mitochondria

The organelles within cells that generate most of the cell's supply of ATP, used as a source of chemical energy, and involved in a range of other processes including signaling and cellular differentiation.

Nuclei

Membrane-bound organelles found in eukaryotic cells that contain most of the cell's genetic material.

Chloroplasts

Organelles found in plant and algal cells responsible for photosynthesis, containing the pigment chlorophyll.