Lab exam exercise 3

Question 1

Title of Experiment 3?

Answer 1

CELL MEMBRANE – NAKED EGGS

Question 2

Materials of CELL MEMBRANE – NAKED EGGS

Answer 2

1. Several chicken eggs (at least seven per group)
2. Large container
3. Vinegar
4. Scale
5. Pencil and notepaper for recording information
6. Several substances in which to soak or bury the de-shelled eggs, such as distilled water, dry salt or saltwater solutions, colored water, corn syrup, rubbing alcohol, cornstarch, or baking soda
7. Containers to hold the soaking eggs
8. Plastic wrap
9. Masking tape and marker for labeling containers
10. Optional: nitrile or latex gloves for handling eggs, glass jars or other small objects to hold down floating eggs
11. Tap water
12. Salt solutions (3.1.:1 tablespoon/1 cup of water; 3.2.: 2 tbsp/1 cup of water; 3.3.: 4 tbsp/1 cup of water)
13. Simple syrup (dissolve 1 cup of sugar in 1 cup of water)
14. Food coloring solutions (red, blue, green color)

Question 3

Assembly – to be done at home

1. Begin by _______. What do you notice? Is it possible to see anything besides the hard, white shell?

Answer 3

studying your egg

Question 4

Assembly – to be done at home

2. Take out your ________. Think about what a cell might look like and make a sketch.

Answer 4

notebook

Question 5

Assembly – to be done at home

3. De-shell the eggs by placing them in a _____ (basin or jar) so that they touch as little as possible. Add ___ to cover the eggs (see photo below), and cover the container.

Answer 5

large container
vinegar

Question 6

Assembly – to be done at home

4. ________ anything you notice about the egg as soon as it is covered by the vinegar

Answer 6

Write down

Question 7

Assembly – to be done at home

5. Wait ________ before checking the egg again. Now what does it look like?

Answer 7

ten minutes

Question 8

Assembly – to be done at home

6. Allow the eggs to sit for ___________. Note: Changing out the vinegar halfway through (after 24 – 36 hrs.) and replacing it with fresh vinegar will speed up the process.

Answer 8

24 - 72 hours at room temperature

Question 9

Assembly – to be done at home

7. After _______ have passed, carefully take out your egg. The eggshells will leave residue in the vinegar bath (see photo below). Gently rinse the eggs in water to remove any traces of white material. What is this white material?

Answer 9

three days

Question 10

Assembly – to be done at home

8. After rinsing the egg, roll it around in your hands. What does it feel like? When you’re done playing with the egg, take it outside. Gently use your finger to ____ the egg’s soft outer layer. What do you see?

Answer 10

poke

Question 11

Assembly – to be done at home

9. With this part of the experiment, the parts of the egg mimic three important parts of a cell: the _________. Can you identify what’s what in your naked egg?

Answer 11

membrane, the nucleus and the cytoplasm

Question 12

Assembly – to be done at home

10. _________ the de-shelled eggs until ready to be used. Bring the naked egg on Tuesday (Sept. 10, 2024) Note: Be sure to handle the de-shelled eggs gently. But despite your best efforts, some eggs will break. Try to keep them off carpeted areas, and soak several extra eggs, just in case.

Answer 12

Cover and refrigerate

Question 13

Assembly – to be done inside the classroom: Day 1

Use a ___ to find the mass of each de-shelled egg before treatment. Record the result on notepaper.
Place one egg in a labeled container and cover it with your chosen treatment. (If the egg floats, you may use something to hold it down, such as a glass jar; see photo below.) Repeat for each of the remaining treatments. Be sure to set aside an untreated “control” egg. After taking its mass, cover the control egg with plastic wrap, and set it in a container alongside the treatment eggs.

Answer 13

scale

Question 14

Assembly – to be done inside the classroom: Day 1

Use a scale to find the mass of each de-shelled egg before treatment. Record the result on notepaper.
Place ________ in a labeled container and cover it with your _______. (If the egg floats, you may use something to hold it down, such as a glass jar; see photo below.) Repeat for each of the remaining treatments. Be sure to set aside an untreated “control” egg. After taking its mass, cover the control egg with plastic wrap, and set it in a container alongside the treatment eggs.

Answer 14

one egg
chosen treatment

Question 15

Assembly – to be done inside the classroom: Day 1

Use a scale to find the mass of each de-shelled egg before treatment. Record the result on notepaper.
Place one egg in a labeled container and cover it with your chosen treatment.(If the egg floats, you may use something to hold it down, such as a glass jar; see photo below.) Repeat for each of the remaining treatments. Be sure to set aside an _____ egg. After taking its mass, cover the control egg with plastic wrap, and set it in a container alongside the treatment eggs.

Answer 15

untreated “control”

Question 16

Assembly – to be done inside the classroom: Day 1

Use a scale to find the mass of each de-shelled egg before treatment. Record the result on notepaper.
Place one egg in a labeled container and cover it with your chosen treatment.(If the egg floats, you may use something to hold it down, such as a glass jar; see photo below.) Repeat for each of the remaining treatments. Be sure to set aside an untreated “control” egg. After taking its mass, cover the control egg with ____, and set it in a container alongside the treatment eggs.

Answer 16

plastic wrap

Question 17

Assembly – to be done inside the classroom: Day 1

no treatment, just wrap the naked egg in plastic wrap and store inside the refrigerator.

Answer 17

Control

Question 18

Assembly – to be done inside the classroom: Day 1

Tap water

Answer 18

Treatment 1

Question 19

Assembly – to be done inside the classroom: Day 1

Distilled water

Answer 19

Treatment 2

Question 20

Assembly – to be done inside the classroom: Day 1

Salt solutions – bring table salt on Tuesday

Set A: 1 tablespoon/1 cup of water
Set B: 2 tbsp/1 cup of water
Set C: 4 tbsp/1 cup of water

Answer 20

Treatment 3

Question 21

Assembly – to be done inside the classroom: Day 1

Salt solutions – bring table salt on Tuesday

Set A: _____
Set B: 2 tbsp/1 cup of water
Set C: 4 tbsp/1 cup of water

Answer 21

1 tablespoon/1 cup of water

Question 22

Assembly – to be done inside the classroom: Day 1

Treatment 3 - Salt solutions – bring table salt on Tuesday

Set A: 1 tablespoon/1 cup of water
Set B: _____
Set C: 4 tbsp/1 cup of water

Answer 22

2 tbsp/1 cup of water

Question 23

Assembly – to be done inside the classroom: Day 1

Treatment 3 - Salt solutions – bring table salt on Tuesday

Set A: 1 tablespoon/1 cup of water
Set B: 2 tbsp/1 cup of water
Set C: ______

Answer 23

4 tbsp/1 cup of water

Question 24

Assembly – to be done inside the classroom: Day 1

Simple syrup – prepare at home

Answer 24

Treatment 4

Question 25

**Assembly – to be done inside the classroom: Day 1** Food coloring solution – bring food coloring

Answer 25

Treatment 5

Question 26

**Assembly – to be done inside the classroom: Day 1** Salt

Answer 26

Treatment 6

Question 27

**Assembly – to be done inside the classroom: Day 1** Treatment 6 - Salt Each treatment should have a Control. Group 1 – _____

Answer 27

Control, Treatment 1

Question 28

**Assembly – to be done inside the classroom: Day 1** Treatment 6 - Salt Each treatment should have a Control. Group 2 - ______

Answer 28

Control, Treatment 2

Question 29

**Assembly – to be done inside the classroom: Day 1** Treatment 6 - Salt Each treatment should have a Control. Group 3 - _________

Answer 29

Control, Treatment 3: Set A

Question 30

**Assembly – to be done inside the classroom: Day 1** Treatment 6 - Salt Each treatment should have a Control. Group 4 – _____

Answer 30

Control, Treatment 3: Set B

Question 31

**Assembly – to be done inside the classroom: Day 1** Treatment 6 - Salt Each treatment should have a Control. Group 5 – _______

Answer 31

Control, Treatment 3: Set C

Question 32

**Assembly – to be done inside the classroom: Day 1** Treatment 6 - Salt Each treatment should have a Control. Group 6 – ________

Answer 32

Control, Treatment 4

Question 33

**Assembly – to be done inside the classroom: Day 1** Treatment 6 - Salt Each treatment should have a Control. Group 7 – _____

Answer 33

Control, Treatment 5

Question 34

**Assembly – to be done inside the classroom: Day 1** Treatment 6 - Salt Each treatment should have a Control. Group 8 – ______

Answer 34

Control, Treatment 6

Question 35

**Assembly – to be done inside the classroom: Day 2** Observe any changes in the ________ of your experimental eggs. Record your observations. Then, gently remove your sample eggs from their treatments to measure and record the mass of each one (see photo below). Remove the plastic wrap from the control egg and measure its mass too. Calculate the percentage change in mass for each egg by dividing the final mass by the starting mass and multiplying by one hundred percent.

Answer 35

color, size, or shape

Question 36

**Assembly – to be done inside the classroom: Day 2** Observe any changes in the color, size, or shape of your experimental eggs. Record your observations. Then, gently ____ your sample eggs from their ____ to ______ the mass of each one (see photo below). Remove the plastic wrap from the control egg and measure its mass too. Calculate the percentage change in mass for each egg by dividing the final mass by the starting mass and multiplying by one hundred percent.

Answer 36

remove treatments measure and record