Mais les résultats doivent être attendus longtemps et il n'y a généralement pas de temps metronidazole prix L'autre cas, c'est que l'achat d'un ou d'un autre antibiotique dans une pharmacie classique nécessite des dépenses matérielles considérables et pas toutes les personnes ne peuvent acheter des produits pharmaceutiques aussi coûteux.
BIOLOGY 230 Review Sheets
1. Label the following as atoms, cations, anions, or molecules.
______________ Mg+2______________ H2O______________ O2______________ Na______________ Cl-______________ Ca+2
2. In saline (salty water), what is the solute and what is the solvent?
3. Be able to recognize biomolecules indicating their major molecular group and specific type.
4. Calcium atoms have two electrons in their outermost shell. Diagram and explain how calcium atoms form
ionic bonds with chlorine atoms, which have seven electrons in their outermost shell.
5. Indicate the charge of these atoms, when found in their common ionic form.
6. The presence of hydrogen ions stimulates the brain to increase respiration rate. Johnny’s blood pH is 7.25.
Will Johnny likely be breathing faster or slower than normal? Why?
7. Tagamet decreases acid production in the stomach. What occurs to stomach pH after taking this
medication? What happens to the levels of H+ ions in the stomach?
8. The stomach mucus lining has a high pH. How does this protect the cells lining the stomach wall? What
would happen if the mucus lining was damaged?
Cel Biology Review
10. What organelle is responsible for guiding the translation of mRNA?
11. If you placed a red blood cell (RBC) in a solution that was hypotonic compared to the cell, what would
12. What is the difference between simple diffusion and facilitated diffusion?
13. The resting membrane potential (RMP) is due to the unequal distribution of K+ and Na+ ions along the
interior and exterior surface of a cell’s membrane, in which there are more positively charged ions along theexterior surface than along the interior surface. The result of such an ion distribution is a cell membranethat is relatively more negative inside of the cell than outside of the cell. Review the RMP section of thecells chapter and answer the following questions.
• What would happen to the cell membrane potential (i.e., what would happen to the membrane voltage) if
channels were placed in the cell membrane that freely allowed Na+ ions to pass through the membrane?
• What would happen to the cell membrane potential if many new K+ channels opened, allowing rapid
14. What organelle is responsible for production of ATP through aerobic respiration and electron transport
15. List four types of active transport.
16. List three types of passive transport.
17. __________________________ are membrane spheres within a cell that often contain digestive enzymes,
and are used, for example, to digest particles consumed by the cell (endocytosis) and degrade worn-out cellparts.
18. Adipocytes are cells that are responsible for the storage of lipids and are found in many different organs.
Beta cells in the pancreas produce the protein hormone insulin. Which of these cell types is likely to havean extensive rough endoplasmic reticulum? Why?
19. When liver cells convert glycogen into glucose, intracellular glucose concentrations can become higher
than extracellular glucose concentrations. What do you think happens to facilitated diffusion
when this happens?
21. What would happen to the resting membrane potential of a cell that was poisoned by ouabain, an inhibitor
22. Each of two compartments separated by a membrane that is completely permeable to glucose, are filled
with a solution that has a 1M (molar) glucose concentration. After several hours one compartment has a1.5M glucose solution (i.e., it has a higher glucose concentration) and the other compartment has a 0.5Mglucose concentration. What kind of transport occurred in the membrane to produce this change?
23. Describe how a cell manufactures a protein and then exports it. Mention all molecules and organelles
24. Describe how a cell takes in food (either a large or small particle), digests it (if necessary), and then
converts food energy into ATP energy using oxygen.
Problem Solving Review Questions
Try solving these problems without using your book. If you run into problems, then use your book for
assistance. The point of these problems, is not to have you look up a bunch of answers, but, instead, to have
you practice solving problems.
25. A cell is placed into an isotonic solution. After one hour, the cell has become hypertonic relative to the
solution. Explain how this could have happened.
26. Cholera is caused by toxins released by the bacterium Vibrio cholera.
This disease has killed MILLIONS of
people in the last two hundred years due to dehydration associated with diarrhea. The toxin produced by thebacteria causes intestinal cells to activate pumps that transport chloride ions into the lumen of the intestine.
The movement of chloride ions in turn, causes sodium ions to move into the lumen. How could such ionicmovement lead to dehydration?
27. What would happen to your red blood cells if you were hooked up to an IV of pure distilled water?
28. What type of transport would be used by leucocytes when they secrete toxic substances and enzymes on to
the surface of parasitic worms in humans?
29. Given what you know about the process of diffusion, why do we have a circulatory system?\
30. A researcher is trying to determine the type of transport that a cell uses to transport substance X into the
cell. She is able to measure the concentration of X inside of, and outside of, the cell, and she is able todetermine the rate at which the substance moves into the cell. Use the following graph of her data todetermine what type of cell transport is being used to move substance X into the cell.
ROCHE DISCONTINUES AND PLANS TO DELIST ACCUTANE IN THE U.S. June 29, 2009 -- Nutley, N.J. Roche Discontinues and Plans to Delist Accutane in the U.S. Hoffmann-La Roche Inc. has notified the U.S. Food and Drug Administration(FDA) of its intent to immediately discontinue the manufacture and distributionof Accutane® (isotretinoin), its ground-breaking treatm
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