:1. despite differences in size and shape, all cells have dna and a: a- cell wall b- mitochondria c- cell membrane d- nucleus 2. which of the following is not a part of the cell theory? a- all cells contain a nucleus. b- cells are the basic unit of structure and function in an organism. c- all living things are made of cells. d- new cells are produced from existing cells. 3. when using a light microscope to view a cell she obtained from scraping under her fingernails, mrs. smith notices that the cell lacks a nucleus; therefore, mrs. smith concludes that the cell must be a type of cell. a- animal b- plant c- eukaryotic d- prokaryotic 4. which of the following kinds of cell perform basic functions such as obtaining energy from food? a- plant cells, but not animal cells b- animal cells, but not plant cells c- both plant cells and animal cells d- neither plant cells nor animal cells 5. which cell structures are sometimes found attached to the endoplasmic reticulum? a- chloroplasts b- ribosomes c- nuclei d- mitochondria