Reference no: EM132837589
Membranes and Chemical transport
One of the main functions of the cell membrane is to control the movement of chemicals into and out of the cell.
A) Web site name: Florida State College at Jacksonville
Read "Membranes"
1). What are two molecules that can freely move across the cell membrane?
2). In diffusion particles move from areas of _________ concentration to areas of ___________ concentration.
3). If the temperature of a solution increased, would you expect the rate of diffusion to increase or decrease?
4). Give an example of a chemical that moves into cells by facilitated diffusion: ___________________________
5). Is external energy required for facilitated diffusion? ___________________
6). What is "osmosis"? _____________________________________________
7). What is the clinical importance of osmosis? __________________________
8). Why can too much water kill you? _________________________________
9). What is meant by :
a) Hypertonic ________________________________________________
b) Isotonic ___________________________________________________
c) Hypotonic _________________________________________________
10). What happens to a plant cell in a hypotonic solution? __________________
11). What happens to an animal cell in a hypotonic solution? ________________
12). What happens to a plant cell in a hypertonic solution? __________________
B) Web site name: Estrella Mountain Community College
Read "Transport in and out of cells"
13). What is "water potential?" _______________________________________
14). In which direction (into or out of the cell) is the net flow of the following chemicals :
a) carbon dioxide _______________________
b) oxygen _____________________________
15). What are two examples of semi-permeable membranes apart from the cell membrane?
16). What problem does Paramecium have? _____________________________
17). How does Paramecium overcome this problem? ______________________
18). What is "active transport"? _______________________________________
19). Look at the diagram of active transport. Are the two transported ions moving in the same direction, or in different directions, through the "symport"? ______________________________________
20). Which ion is kept at high concentrations inside nerve cells? _____________
21). What is the difference between exocytosis and endocytosis ? ____________
22). What is "phagocytosis"? _________________________________________
23). How does insulin enter animal cells? _______________________________
C) Web site name: Cells Alive
24). What is the function of blood plasma? ______________________________
25). What are three specialized cells that are among the red cells?
Click on the bottom of the page, or "Anatomy of a Splinter" at the top.
26). How do white cells know there is damage to control?
27). What is "diapedesis"? ____________________________________________
Click on "Chemotaxis"
28). Which cells are the body's first line of defense against bacteria? __________
Click on the Play icon to view the video.
29). Roughly how many cells are moving across the screen? ________________
Click on "Phagocytosis"
30). What does "Phagocyte" mean? ____________________________________
Click on the Play icon to see the video.
31). How many yeast (Candida) cells are being digested? __________________
32). Do you think the sound on the movie is the real sound the cell makes? ____
Membranes are important because they control which chemicals can enter or leave the cell. Cancer researchers are trying to develop better ways of killing cancer cells while leaving regular body cells alone.
D) Web site name: Science Daily
Read "Tumors feel the deadly sting of nanobees"
33). Which toxin is the focus of this study? ________________
34). How does this protein kill cells? __________________________________
35). How many injections of these nanoparticles were given over several days? _________________________________
36). How much was the size of melanoma decreased compared to untreated controls? ________ %
37). Why does the drug concentrate in tumor cells and not regular cells?
38). What problem is caused by directly injecting mellitin into the bloodstream? _______________________
39). Why is the size of nanoparticles (six millionth of an inch) so important?
E) Website name: Science Daily
Read "Broad-spectrum antiviral"
40). What is the limitation of antibiotics?
41). What is the problem with current "broad-spectrum" antivirals?
42). List four viruses that this new antiviral compound can stop:
43). How many molecules were screened before they found "LJ001"?
44). Which specific virus was originally blocked by LJ001? ________________
45). Explain how the antiviral compound prevents cells from being infected by the virus.
46). Why does LJ001 not cause ill effects on cell membranes, but it does permanently affect viruses?
Attachment:- Membranes and Chemical transport.rar