Robert Hooke used a microscope to see that cork looked like it was made of little boxes. Anton van Leeuwenhoek saw tiny cells swimming in pond water. Which part of cell theory do these observations best support? A. Cells come from other cells.
B. All organisms are unicellular.
C. Cells are the basic unit of life.
D. All organisms are multicellular.

23. Which of the following characteristics do all unicellular organisms share?
A.
All unicellular organisms reproduce.
B.
All unicellular organisms have a nucleus
C.
All unicellular organisms eukaryotes
.D.
All unicellular organisms prokaryotes.

24. Which term describes “one or more cells that carry out all of the processes needed to sustain life”?
A. DNA
B. organism
C. organelles
D. cytoplasm

25. DNA is genetic material that provides instructions for all cell processes. Where is the DNA located in prokaryotes?
A. in the nucleus
B. in the cytoplasm
C. in the flagella
D. in membrane-bound organelles