- What is the function of the nonpolar part of the cytoplasmic membrane?
(a) The cytoplasmic membrane does not have a nonpolar part.
(b) The nonpolar part of the cytoplasmic membrane prevents extra-
cellular fluid from leaving the cell and intracellular fluid from enter-
ing the cell.
(c) The nonpolar part of the cytoplasmic membrane is hydrophobic and
prevents extracellular fluid from entering the cell and intracellular
fluid from exiting the cell.
(d) The nonpolar part of the cytoplasmic membrane is to position organ-
elles within the cell. - The function of the transport protein is
(a) to regulate cell division
(b) to regulate the positioning of organelles within the cell
(c) to regulate movement of molecules through the cytoplasmic membrane
(d) to give a cell its color - The function of the channel protein is
(a) to direct movement of a cell through channels in its environment
(b) to channel substances among organelles within the cell
(c) to form pores (called channels) in the cytoplasmic membrane that
permit the flow of molecules through the cytoplasmic membrane
(d) to form pores (called channels) in the nucleus membrane that permit
the flow of molecules through the nuclei of the cell - Passive transport is
(a) the process of moving substances through the cytoplasmic mem-
brane without expending energy by using a concentration gradient
(b) the process of moving substances through the cytoplasmic mem-
brane without expending energy by using a transport protein
(c) the process of moving substances through the cytoplasmic mem-
brane by expending energy by using a concentration gradient
(d) the process of moving substances through the nucleus membrane
without expending energy by using a concentration gradient - What is facilitated diffusion?
(a) A passive transport process in which molecules or ions of a sub-
stance move from a region of lower concentration to a region of
higher concentration without the assistance of an integral protein
(b) A passive transport process in which molecules or ions of a sub-
stance move from a region of lower concentration to a region of
higher concentration with the assistance of an integral protein
(^84) CHAPTER 4 Prokaryotic and Eukaryotic Cells