1. Cut 3 cubes from your agar block 1. 1x1x1 (cm) 2. 2x2x2 (cm) 3. 3x3x3 (cm) 2. Fill 3 separate...

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Procedure 1. Cut 3 cubes from your agar block 1. 1x1x1 (cm) 2. 2x2x2 (cm) 3. 3x3x3 (cm) 2. Fill 3 separate beakers with 20mL acetic acid solution 3. Drop a cube in each beaker 4. Wait 10 minutes and then remove cubes onto white sheet of paper 5. Cut your cubes in half and measure the distance the acetic acid penetrated. While waiting the 10 minutes: workbook pages 31-34

Transcript of 1. Cut 3 cubes from your agar block 1. 1x1x1 (cm) 2. 2x2x2 (cm) 3. 3x3x3 (cm) 2. Fill 3 separate...

Page 1: 1. Cut 3 cubes from your agar block 1. 1x1x1 (cm) 2. 2x2x2 (cm) 3. 3x3x3 (cm) 2. Fill 3 separate beakers with 20mL acetic acid solution 3. Drop a cube.

Procedure

1. Cut 3 cubes from your agar block1. 1x1x1 (cm)2. 2x2x2 (cm)3. 3x3x3 (cm)

2. Fill 3 separate beakers with 20mL acetic acid solution

3. Drop a cube in each beaker4. Wait 10 minutes and then remove cubes

onto white sheet of paper5. Cut your cubes in half and measure the

distance the acetic acid penetrated. While waiting the 10 minutes: workbook pages 31-34

Page 2: 1. Cut 3 cubes from your agar block 1. 1x1x1 (cm) 2. 2x2x2 (cm) 3. 3x3x3 (cm) 2. Fill 3 separate beakers with 20mL acetic acid solution 3. Drop a cube.

Data Table

Cube dimension

Surface area (cm2)

Volume (cm3)

SA/V ratio

% penetrated

Sketch of cube

1cm

2cm

3cm

% penetrated instructions:1. Calculate total volume of each cube (volume = L x W x H)2. Calculate volume that did not turn pink. (That is, calculate total

volume of the small portion of the cube that did not turn pink – use the same formula L x W x H)

3. Calculate volume diffused = total volume – volume not pink.4. Calculate % diffusion = Volume diffused /total volume x 100

Page 3: 1. Cut 3 cubes from your agar block 1. 1x1x1 (cm) 2. 2x2x2 (cm) 3. 3x3x3 (cm) 2. Fill 3 separate beakers with 20mL acetic acid solution 3. Drop a cube.

Analysis1. In terms of maximizing diffusion,

what was the most effective size cube that you tested? Why was that size most effective at maximizing diffusion? (What affects the rate?)

2. If a large surface area is helpful to cells, why do cells not grow to be very large?

3. How does your body adapt surface area-to-volume ratios to help exchange gases/nutrients?

Reminders:Wednesday: Exam (Homework: Read chapter 6 and finish agar lab, and WB)Thursday: Test corrections (lab due, chapter 6 due) homework: ch.6 quizFriday: Cell structure discussion/analogies (Homework: Finish analogies,And bring in materials for cell membrane.


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