17.  Which of the following statements does not form part of the "cell theory"?

 a) All living organisms are made of cells.

 b) The cell is the basic functional unit of all living organisms.

 c) All plants are made of cells but only certain types of animals are.

 d) All cells come from pre-existing cells.

18. In which order does mitosis occur?

a) telophase, anaphase, metaphase, and prophase

b) metaphase, prophase, telophase, and anaphase

c) prophase, metaphase, telophase, and anaphase

d) prophase, metaphase, anaphase, and telophase

19.  The two halves of a replicated chromosome line up in the middle during:

a) Interphase           

b) Metaphase

c) Telophase

d) Anaphase

20.  Animal cells are different from plant cells in that

a) animal cells have cell walls and plant cells do not.

b) plant cells have nuclei and animal cells do not.

c) animal cells have mitochondria and plant cells do not.

d) plant cells have cell walls and animal cells do not.

21.  Which of the following entities represents the highest level of organization?

a)  Tissue

b)  Cell

c)  Organism

d)  Organ

22.  Which of the following does not correctly pair an organ with its organ system?

a)  Brain / nervous system

b)  Heart / circulatory system

c)  Testes / endocrine system

d)  Liver / digestive system