• 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..

        high...high

        low...low

        high...low

        low...high


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

        gap junction

        cell wall

        nuclear membrane

        cell membrane


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

        small, nonpolar molecule

        ion

        large molecule

        polar molecule


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

        active transport

        osmosis

        diffusion

        facilitated diffusion


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

        polar

        hypotonic

        hypertonic

        isotonic


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

        E. coli

        roses

        portabella mushroom

        giraffe


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

        nucleic acid

        protein

        lipid

        carbohydrate


      1. The sodium potassium pump is an example of

        facilitated diffusion

        active transport

        osmosis

        diffusion


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

        facilitated diffusion

        active transport

        osmosis

        diffusion


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

        hypotonic

        hypertonic

        ionic

        isotonic