Facilitated Diffusion Across a Biological Membrane Analysis Worksheet Ansewer some questions example questions: 1. Facilitated diffusion across a biologi

Facilitated Diffusion Across a Biological Membrane Analysis Worksheet Ansewer some questions

example questions:

1. Facilitated diffusion across a biological membrane requires and moves a substance

its concentration gradient.

a. energy and transport proteins … down; b. energy … down; c. transport proteins … down; d. energy and transport proteins … against; e. transport proteins … against

2. In lab, you use a special balloon that is permeable to water but not sucrose to make an “artificial cell.” The balloon is filled with a solution of 20% sucrose and 80% water and is immersed in a beaker containing a solution of 40% sucrose and 60% water. Which of the following will occur?

a. Water will leave the balloon; b. Water will enter the balloon; c. Sucrose will leave the balloon; d. Sucrose will enter the balloon; e. none of the choices will occur.

3. Some protozoans have special membrane-bound bodies called contractile vacuoles that continually eliminate excess water from the cell. The presence of these membrane-bound bodies tells you that the environment

a. is isotonic to the protozoan; b. is hypotonic to the protozoan; c. is hypertonic to the protozoan; d. contains a higher concentration of solutes than the protozoan; e. none of the choices are correct.

4. Which one of the following processes could result in the net movement of a substance into a cell, if the substance is more concentrated in the cell than in the surroundings?

a. active transport; b. facilitated diffusion; c. diffusion; d. osmosis; e. none of the choices are correct

5. Certain cells that line the stomach synthesize digestive enzymes and secrete them into the stomach. Which of the following processes could be responsible for its secretion?

a. endocytosis; b. exocytosis; c. diffusion; d. pinocytosis; e. passive transport

6. Phagocytosis is to eating as pinocytosis is to

a. osmosis; b. drinking; c. chewing; d. hydrolysis; e. lysis

7. Cells acquire LDLs by

a. osmosis; b. diffusion; c. receptor-mediated endocytosis; d. pinocytosis; e. phagocytosis

8. Cellular respiration occurs in all living things.

a. True; b. False

9. What type of bond joins the phosphates of ATP?

a. hydrophobic; b. hydrogen; c. covalent; d. hydrophilic; e. ionic

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