Ch.7 - The MembraneWorksheetSee all chapters
All Chapters
Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
Ch.4 - Carbon
Ch.5 - Biological Molecules
Ch.6 - Cells
Ch.7 - The Membrane
Ch.8 - Energy and Metabolism
Ch.9 - Respiration
Ch.10 - Photosynthesis
Ch.11 - Cell Signaling
Ch.12 - Cell Division
Ch.13 - Meiosis
Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
Ch.19 - Viruses
Ch.20 - Biotechnology
Ch.21 - Genomics
Ch.22 - Development
Ch.23 - Evolution by Natural Selection
Ch.24 - Evolution of Populations
Ch.25 - Speciation
Ch.26 - History of Life on Earth
Ch.27 - Phylogeny
Ch.28 - Prokaryotes
Ch.29 - Protists
Ch.30 - Plants
Ch.31 - Fungi
Ch.32 - Overview of Animals
Ch.33 - Invertebrates
Ch.34 - Vertebrates
Ch.35 - Plant Anatomy
Ch.36 - Vascular Plant Transport
Ch.37 - Soil
Ch.38 - Plant Reproduction
Ch.39 - Plant Sensation and Response
Ch.40 - Animal Form and Function
Ch.41 - Digestive System
Ch.42 - Circulatory System
Ch.43 - Immune System
Ch.44 - Osmoregulation and Excretion
Ch.45 - Endocrine System
Ch.46 - Animal Reproduction
Ch.47 - Nervous System
Ch.48 - Sensory Systems
Ch.49 - Muscle Systems
Ch.50 - Ecology
Ch.51 - Animal Behavior
Ch.52 - Population Ecology
Ch.53 - Community Ecology
Ch.54 - Ecosystems
Ch.55 - Conservation Biology

Concept #1: Simple Diffusion

Concept #2: Selective Permeability and Transport Proteins

Concept #3: Electrochemical Grandients

Concept #5: Osmoregulation

Practice: The movement solute of molecules along a concentration gradient from high to low is called:

Practice: Osmosis requires a _______________ in order to occur.

Practice: Two solutions of salt water are at different concentrations. The one with lower concentration is ____________________ to the one with higher concentration.

Practice: When plant cells are _________ to their environment then the turgor pressure increases.

Additional Problems
Protons are unable to cross the lipid bilayer because: a. the lipid bilayer is too hydrophilic b. protons are nonpolar c. protons are too small d. the lipid bilayer is only permeable to polar substances e. none of the above
Water passes quickly through cell membranes because: a. the bilayer is hydrophilic. b. it moves through hydrophobic channels. c. water movement is tied to ATP hydrolysis. d. it is a small, polar, charged molecule. e. specialized proteins form hydrophilic channels.
Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are a. hypotonic to both fresh water and the salt solution. b. hypertonic to both fresh water and the salt solution. c. hypertonic to fresh water but hypotonic to the salt solution. d. hypotonic to fresh water but hypertonic to the salt solution. e. isotonic with fresh water but hypotonic to the salt solution. 
If a cell has the same concentration of dissolved molecules as of its outside environment, the cell’s condition is called as beinga. isotonicb. hypertonicc. hypotonicd. hydrophobice. hydrophilic
Simple diffusion:  a. Requires energy b. Utilizes proteins to move molecules across a membrane c. Moves molecules against a concentration gradient d. Cannot occur without a membrane present e. Does not require energy
The diffusion of water across a selectively permeable (biological) membrane is:  a. Facilitated diffusion b. Active transport c. A rare occurrence d. Osmosis e. Always beneficial to a cell
If the environment surrounding a cell has a lower concentration of solute than the cell:  a. The environment is isotonic to the cell b. The environment is hypertonic to the cell c. The cell will not experience a net gain or loss of water d. The environment is hypotonic to the cell e. The cell will die
If a cell has a 95% concentration of water in its cytoplasm and the environment surrounding the cell has a 90% concentration of water:  a. Water will flow into the cell by osmosis b. Water will flow out of the cell by active transport c. Water will flow out of the cell by osmosis d. Water will flow into the cell by active transport e. Water will flow into the cell by facilitated diffusion
The movement of substances to regions of lower concentration is calleda. active transportb. diffusionc. osmosisd. pumpinge. exocytosis
If two solutions have unequal concentrations of a solute, the solution with the lower concentration is calleda. isotonicb. hypertonicc. hypotonicd. hypnotice. osmosis
Plants and animals that live in estuaries face a dilemma in maintaining water balance inside their cells. During high tide they are in salt water, while at low tide they are in fresh water. At high tide a plant or animal cell will be in ____.  a. An isotonic solution b. A hypertonic solution c. A hypotonic solution d. Equilibrium e. Osmosis
Osmosis can only occur if water travels through thea. cell wallb. semi-permeable membranec. vacuoled. ERe. cytoskeleton
If O2 is found in high concentration on the outside of a cell: a. energy will be expended to pump it inside the cell. b. it will passively diffuse out of the cell. c. it will move inside the cell through a protein channel. d. it will passively diffuse into the cell.
A cell whose cytoplasm has a concentration of 0.02 molar glucose is placed in a test tube of water containing 0.02 molar glucose. Assuming that glucose is not actively transported into the cell, which of the following terms describes the tonicity of the external solution relative to the cytoplasm of the cell? a. turgid b. hypertonic c. hypotonic d. flaccid e. isotonic
In the 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. The solution in the balloon is ______ relative to the solution in the beaker.A. hypertonicB. hydrophilicC. isotonicD. hypotonicE. hydrophobic
The solute concentration in blood is equivalent to 0.9% NaCl.Several drops of blood were added to three different solutions: 0.09% NaCl, 0.9% NaCl, and 9% NaCl. What would happen to the cells dipped in three different solutions?
If more sugar were added to the solution on the elft side of the tube, what would happen to the water level on the right side of the tube?A. The water level would go downB. The water level would riseC. The water level would stay the same
Suppose you dropped a potato strip into a solution. What could you have measured before and after to determine if osmosis occurred? Check all that apply.A. colorB. massC. distanceD. volume (length x width x height)E. number of sides
If you were to do a 50% serial dilution, starting with a 10% concentration, how many dilutions would you have to make before getting 2.5% as your final concentration?
List two properties that influence the rate of diffusion of a particle.
Which of the following is LEAST likely to play a role in the likelihood that a molecule will diffuse across the phospholipid bilayer of a cell's plasma membrane?A. Concentration of the molecule on each side of the membrane.B. Number of double bonds in the moleculeC. Polarity of the moleculeD. Size of the molecule
Intravenous (IV) solutions administered to patients ae normally isotonic. Which of the following is most likely if an IV ofdistilled water is administered to a patient?A. The cells that are exposed to hypotonic solutions will expand as water moves osmotically into the cells from the blood.B. The cells that are exposed to hypotonic solutions will shrink as a result of salt moving out of the cells into the blood.C. The cells that are exposed to hypertonic solutions will expand as a result of salt moving into the cells from the blood.D. The cells that are exposed to hypertonic solutions will shrink as water moves out of the cells and into the blood.
What molecules are permeable to cell membrane? What molecule are impermeable to cell membrane? How do they cross plasma membrane?
Describe the following types of transport processes in cells: simple diffusion, facilitated diffusion, active transport, pinocytosis, receptor-mediated endocytosis, phagocytosis, and exocytosis.