Cell Transport Homework packet
Name:________________________
Cell Transport HW #1 The picture below represents a tiny blood vessel (called a capilla...
Cell Transport HW #1 The picture below represents a tiny blood vessel (called a capillary) with body cells surrounding it. Blood within the capillary will transport substances to the cells and collect wastes from cells.
Use the following 4 choices for questions 1 & 2: a) nutrients
b) oxygen
c) carbon dioxide
d) waste materials
1) Which of the above materials will diffuse from the blood into the cells? __________________________________ Which of the above materials will diffuse from the cells into the blood?
__________________________________ In order for oxygen to diffuse into the cells, what must the concentration of oxygen in the cell be in
comparison to the concentration of oxygen in the blood? ______________________________________________________________________________________________ ______________________________________________________________________________________________ In order for carbon dioxide to diffuse out of the cells, what must the concentration of carbon dioxide in the
Cell Transport HW #2 ______ 1. What two types of organic molecules is the cell membrane mostly composed of? (choose two) a. carbohydrates b. lipids c. proteins d. nucleic acids ______2. Cellular transport takes place in which of the following organisms? 1
a) unicellular only b) multicellular only c) only organisms which have a circulatory system d) all organisms 3. Cells must be able to exchange materials into and out of cells in order to maintain a state of balance otherwise known as ________________________________. 4. Any type of cell transport which does NOT require an input of cellular energy is called_____________________. 5. A cell membrane allows substance X into the cell. It does not allow substance Y into the cell. Which of the following are true? (Draw a picture if it will help.) A. the membrane is impermeable to both X and Y B. the membrane is permeable to both X and Y C. the membrane is permeable to Y but impermeable to X D. the membrane is selectively permeable 6. Fill in the blanks of the diagram using the word bank given. WORD BANK:
phospholipid membrane proteins hydrophobic tail
carbohydrate hydrophilic head lipid bilayer
7. Which term means “water-loving”? ___________________________
2
inside outside
8. We know that the “heads” of the phospholipids face out towards the environment and cell cytoplasm. Which parts of the phospholipids are in the interior of the cell membrane? _____________________________________
9. Choose which of the following statements is FALSE. a. Nucleic acids are important components of the cell membrane. b. Carbohydrates on the outside surface of the cell membrane help cells identify each other. c. Proteins in the membrane may form channels or pumps to help transport certain materials. d. Some proteins attach to the cytoskeleton and help a cell to move or change shape. 10. Which of the following is NOT a type of passive transport? a. diffusion b. osmosis c. facilitated diffusion d. none of these
Cell Transport HW #3
Two sides of a container are separated by a membrane permeable to both water and iodine. BEGINNING OF THE EXPERIMENT:
The left side of the membrane contains solution of water( H2O) and iodine (KI).
The right side of the membrane contains pure water.
The picture below shows the apparatus after it is allowed to sit for a period of time.
END OF THE EXPERIMENT
3
1) In the illustration on the previous page, which substance (water or iodine) is the solute? __________________________
2) Which substance is the solvent? ___________________________ 3) In the top illustration, which side of the membrane (left or right) shows a true solution – meaning it has both a solute and a solvent? __________________________________________
4) Fill out the following chart: Number of Molecules at the Beginning of the Experiment Left Side
Right Side
Number of Molecules at the End of the Experiment Left Side
Right Side
Iodine Water 5) Did diffusion take place during this experiment? _________________Which molecules (water, iodine, or both) diffused during this experiment? _____________________________________
6) Describe the movement of water and iodine molecules during this experiment.
In which direction did the iodine molecules diffuse? ( left to right , right to left ) circle one
In what direction did the water molecules diffuse? ( left to right , right to left ) circle one
Iodine molecules moved from an area of _______________ (high,low) concentration of iodine to an area of _____________________high, low) concentration of iodine.
Water molecules moved from an area of high _______________(water, iodine) concentration to an area of low ________________(water, iodine) concentration.
Movement is always from ___________(high, low) to ___________ (high, low).
Always compare movement of __________________(like, unlike) molecules.
7) At the beginning of the experiment (on the first page), the two sides of the apparatus have differences in the concentrations of solute particles. What is this difference called? _________________________________
8) Does the movement of water or iodine in this experiment require energy other than the heat found naturally in the molecules? ____________________________
9) What is another term for the type of transport that does not require metabolic energy (ATP)? (circle answer) 4
Passive transport
Active transport
10)
Describe the concentrations of iodine and water molecules in the two sides of the container at
the end of the experiment. ______________________________________
11)
What term do we use to describe this condition?_________________________________________
At the end of the experiment, are molecules of iodine and water still moving? Explain. ______________________________________________________________________________________________ ______________________________________________________________________________________________
12)
Cell Transport HW #4 1. Which of the following is true of facilitated diffusion? A. Protein channels assist the diffusion of substances B. Molecules can move into or out of the cell freely C. Substances do not move because of the concentration gradient D. Water moves only into the cell
2. Which of the following statements tells how facilitated diffusion differs from simple diffusion? A. Particles move through cell membranes without the use of energy by cells. B. Particles tend to move from high concentration to lower concentration. C. Particles move within channel proteins that pass through cell membranes. D. Particles tend to move more slowly than they would be expected to move.
3. Place a check mark in the table below to indicate whether the example given illustrates osmosis or diffusion. Yes, yes we know that osmosis is a type of diffusion but let’s just see if you can distinguish osmosis from “regular” (nonosmotic) diffusion. Is it osmosis? The smell of pizza wafting through the air A plant wilting Food coloring spreading out through a beaker of water You smell the scent of a skunk as you drive by some roadkill Pickles are smaller than the cucumbers that they started out as
