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Unit 3 Review Exercise Complete the following exercises, writing as clearly and legibly as possible. Exercise 1: Why are cells small? To understand this, we first have to understand surface area to volume ratios. Let's start with surface area. Imagine a box of sugar cubes. The surface area of the cube is calculated by finding the area (length x width) of one side. But we want to know the whole surface. On a cube, there are 6 sides, so we multiply that area by 6. So, the surface area of a cube is length x width x 6. Volume is another simple calculation. We just multiply length x width x height. Calculate the volume for each of the diagrams below. The one we are most interested in, though, is the surface area to volume ratio, which is just surface area divided by volume. Complete the calculations in the table below for each diagram. 1 UNIT OR CM UNITS UNITS UNITS Figure Total Number of Cubes Surface Area (L x W x 6) Volume (L x W x H) Surface Area to Volume Ratio (SA/V) Total Surface of Individual Cubes (6 x D cubes) What happened to the surface area as the size increased? What happened to the volume as the size increased? What happened to the surface area to volume ratio as the size increased? Now imagine you're looking at a very large cell next to a very small cell. Which one has a larger surface area to volume ratio?

Unit 3 Review Exercise

Complete the following exercises, writing as clearly and legibly as possible.

Exercise 1: Why are cells small?

To understand this, we first have to understand surface area to volume ratios. Let's start with surface area.

Imagine a box of sugar cubes. The surface area of the cube is calculated by finding the area (length x width) of one side. But we want to know the whole surface. On a cube, there are 6 sides, so we multiply that area by 6. So, the surface area of a cube is length x width x 6.

Volume is another simple calculation. We just multiply length x width x height. Calculate the volume for each of the diagrams below. The one we are most interested in, though, is the surface area to volume ratio, which is just surface area divided by volume.

Complete the calculations in the table below for each diagram.

1 UNIT OR CM

UNITS

Figure

Total Number of Cubes

Surface Area (L x W x 6)

Volume (L x W x H)

Surface Area to Volume Ratio (SA/V)

Total Surface of Individual Cubes (6 x D cubes)

What happened to the surface area as the size increased? What happened to the volume as the size increased? What happened to the surface area to volume ratio as the size increased? Now imagine you're looking at a very large cell next to a very small cell. Which one has a larger surface area to volume ratio?

unt 3reviewexercise complete the following exercises writing clearly and legibly as possible exercise 1 why are cells small to understand this we first have t0 undersiand surface area t0 vol 02667

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