Effect of Solutions on Cells

 Effect of  Solutions on Cells

What happens when cells are place in different kinds of solutions

Plant cells placed in a hypertonic solution will undergo plasmolysis, a condition where the plasma membrane pulls away from the cell wall as the cell shrinks. The cell wall is rigid and does not shrink. 

   The Elodea cells  have been placed in a 10% NaCl solution. The contents of the cells have been reduced to the spherical structures shown.  

 

 

   Normal Elodea cells

 

 

Animal cells placed in a hypertonic solution will undergo crenation, a condition where the cell shrivels up as it loses water. Red blood cells in a hypotonic solution will swell and burst or lyse.

                               

 

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Massengale’s Classroom Rules

 

 

 

“No one has the right to interfere with the learning of another.”

  1. Be in assigned seat ready to work BEFORE the tardy bell rings.
  2. NEVER argue or talk back to the teacher!
  3. Bring paper, pencil, notebook, and assignments every day. I do NOT loan pencils.
  4. Keep feet, book bags, and other objects out of the walkway.
  5. No form of disruptive behavior will be tolerated.
  6. Save questions until after roll is checked.
  7. Work only on biology in class & don’t close up early.
  8. I will dismiss you (not the bell); leave chairs pushed up, books closed, & your area clean.
  9. N0 gum, food, drinks, or candy may be brought into class.
  10. Don’t reach across my desk or use my materials without permission.
  11. Always be on time!

Assignments – No credit will be given unless :

  1. Assignments must be COMPLETE to receive credit. NO LATE OR INCOMPLETE WORK WILL BE ACCEPTED.
  2. Assignments must be WRITTEN IN PENCIL unless specified otherwise by the teacher or No credit!
  3. NAME, DATE, and PERIOD must be written in the upper right corner and chapter & assignment must be written on the top line to the left to receive credit.
  4. All assignments must be TURNED IN BEFORE LEAVING SCHOOL for appointments, field trips, etc in order to receive credit. 
  5. YOU ARE RESPONSIBLE FOR YOUR MAKE UP WORK so check the board each day and turn in assignments & schedule missed tests the day you return to school.
  6. All missed labs will be made up AFTER SCHOOL & tests made up BEFORE OR AFTER SCHOOL. 
  7. No credit will be given if you do not use standard-size, loose-leaf notebook paper.( No trimming paper to the correct size!)
  8. Place assignments in the basket with the name side facing up! NEVER turn papers upside down!

Outlines will NOT receive credit unless:

  1. Assigned pictures & drawings are with each section (not at the end)
  2. Key words circled
  3. All main ideas included & underlined
  4. All objectives answered and noted with an asterisk (*)
  5. On time (beginning of class, not the end of class)
  6. Written in pencil

Testing:

  1. Clean & erase everything from your desk before testing.
  2. Don’t talk until every paper is turned in or you will receive a zero.
  3. Only two people at a time should be up turning in their tests.
  4. Never walk in front of the classroom  on test day!
  5. Place tests name side up in the test basket.
  6. Use ONLY PENCILS to take test or receive a zero.
  7. No credit is given for misspelled words.
  8. A grade of zero will be given for cheating. 
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Crossword Puzzles

Crossword Puzzles

All Materials © Cmassengale

 

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Class Data Table Sci Meth & Genetics

Table 2

Class Data on Right hand Width and Length (cm)

Class Period:

Student Gender
(M / F)
Hand Length (cm) Hand Width (cm)
1. M / F
2. M / F
3. M / F
4. M / F
5. M / F
6. M / F
7. M / F
8. M / F
9. M / F
10. M / F
11. M / F
12. M / F
13. M / F
14. M / F
15. M / F
16. M / F
17. M / F
18. M / F
19. M / F
20. M / F
21. M / F
22. M / F
23. M / F
24. M / F

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Current Science News

 

CURRENT SCIENCE NEWS SITES!