Review Questions Two

1) The random movement of molecules from an area of high concentration to an area of lower concentration is called: –

a. Diffusion   b. Exocytosis   c. Facilitated diffusion d. Active transport  e.  Endocytosis

2) The most important structural elements of the cyto- skeleton are: –

a.         Microfilaments          b. Vacuoles   c. Ribosome  d. Asters   e.  Microtubules

3) Mitochondria functions in the synthesis of

a. DNA           b. MRNA        c. ATP    d. rRNAe. tRNA

4) The nucleolus   a). Is the site of ribosomal RNA synthesis    b). Has a surrounding structure

c). Contains ATP used in chromosome replication   d). It is smaller in secretary cell than in non-secretary.  e). Specifies the chemical structure of enzymes.

5) The Centrosme contains

a. Endoplasmic reticulum   b. Cilia   c. Centrioles          d. Flagella   e.  Vacuoles