Quiz

1. A gram-positive cell wall has

(a) many layers of peptidoglygan, which repels the crystal of violet dye when the cell is stained

(b) many layers of peptidoglygan, which retains the crystal of violet dye when the cell is stained

(c) one layer of peptidoglygan, which retains the crystal of violet dye when the cell is stained

(d) one layer of peptidoglygan, which repels the crystal of violet dye when the cell is stained

2. A cytoplasmic membrane is

(a) a membrane that provides a selective barrier between the nucleus and the cell's internal structures

(b) the cell wall

(c) a membrane that provides a barrier between the cell's internal structures

(d) a membrane that provides a selective barrier between the cell wall and the cell's internal structures

3. Amphipathic means

(a) that the cytoplasmic membrane of a cell is bilayered and contains both polar and nonpolar parts

(b) that the cytoplasmic membrane of a cell is unilayered and contains polar parts

(c) that the cytoplasmic membrane of a cell is unilayered and contains nonpolar parts

(d) that the cytoplasmic membrane of a cell is resistant to all substances residing outside the cell

4. 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 extracellular fluid from leaving the cell and intracellular fluid from entering 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 organelles within the cell.

5. 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

6. 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

7. Passive transport is

(a) the process of moving substances through the cytoplasmic membrane without expending energy by using a concentration gradient

(b) the process of moving substances through the cytoplasmic membrane without expending energy by using a transport protein

(c) the process of moving substances through the cytoplasmic membrane 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

8. What is facilitated diffusion?

(a) A passive transport process in which molecules or ions of a substance 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 substance move from a region of lower concentration to a region of higher concentration with the assistance of an integral protein

(c) An active transport process in which molecules or ions of a substance move from a region of higher concentration to a region of lower concentration with the assistance of an integral protein

(d) A passive transport process in which molecules or ions of a substance move from a region of higher concentration to a region of lower concentration with the assistance of an integral protein

9. Active transport is

(a) the movement of a substance across the cytoplasmic membrane in the direction of the gradient by using energy provided by the cell

(b) the formation of pores (called channels) in the cytoplasmic membrane that permit the flow of molecules through the cytoplasmic membrane

(c) the movement of a substance across the cytoplasmic membrane against the gradient by using energy provided by the cell

(d) is a process in which molecules or ions of a substance move from a region of higher concentration to a region of lower concentration with the assistance of an integral protein

10. What are the two types of endocytosis?

(a) Facilitated diffusion and passive transport

(b) Phagocytosis and pinocytosis

(c) Hydrolysis and cytosol

(d) Nucleoid and cytosol

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