Biology Practice Test – Cells and its Environment

The main similarity between unicellular and multicellular organisms is that both _____

A. perform all life activities.      B. exist as filaments      C. are plants      D. exist as colonies

A virus can sometimes be regarded as a living organism because it ______

A. causes disease in plants and animals.
B. exists in a variety of shapes.
C. reproduces in living cells.
D. is easily visible with the aid of an electron microscope

Which of these organs can be considered vestigial in humans but functional in other mammals? The ______

A. liver      B. appendix      C. rectum      D. stomach

The epidermis of the mammalian skin is an example of a tissue because the cells ______

A. prevent light from passing through them.
B. has a similar structure and function.
C. prevents excessive loss of water.
D. are impregnated with keratin

The structure used for movement in Amoeba is ______

A. cilia.      B. pseudopodia.      C. flagella.     D. endoplasm