• Topic 3 Keystone Review

    The questions in this review refer to topic 3: Cellular Transport

    1. Molecules naturally move from an area of _____ concentration to an area of _____ concentration..

       A. high...high


       C. high...low

       D. low...high

    2. This cell barrier refers to the "fluid mosaic model" and is highly selective about what passes through

       A. gap junction

       B. cell wall

       C. nuclear membrane

       D. plasma membrane

    3. Which of these is the most likely to diffuse through a cell membrane

       A. small, nonpolar molecule

       B. ion

       C. large molecule

       D. polar molecule

    4. Which form of cellular transport moves AGAINST the concentration gradient?

       A. active transport

       B. osmosis

       C. diffusion

       D. facilitated diffusion


    5. Water will exit the cell when placed in a/n _______ environment

       A. polar

       B. hypotonic

       C. hypertonic

       D. isotonic


    6. Which of the following organisms does NOT have a cell wall??

       A. E. coli

       B. roses

       C. portabella mushroom

       D. giraffe

    7. Facilitated diffusion uses which macromolecule to help move items across?

       A. nucleic acid

       B. protein

       C. lipid

       D. carbohydrate


    8. The sodium potassium pump is an example of

       A. facilitated diffusion

       B. active transport

       C. osmosis

       D. diffusion


    9. The diffusion of water across a membrane is known as

       A. facilitated diffusion

       B. active transport

       C. osmosis

       D. diffusion


    10. Plants typically prefer to be in a/n ______ environment.

       A. hypotonic

       B. hypertonic

       C. ionic

       D. isotonic





    C, D, A, A, C, D, B, B, C, A