# 2.1 Cell Theory

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2.1 Cell Theory

## 1. by using the SI Units compare the relative size of

1.1.1. 1 nm

1.2.1. 10 nm

1.3.1. 100 nm

1.4.1. 1μm

### 1.5. eukaryotic cell

1.5.1. up to100 μm

### 1.6. organelles

1.6.1. up to 10 μm

## 2. outline one therapeutic use of stem cells

### 2.1. Where are stem cells found?

2.1.1. in bone marrow

### 2.2. Where stem cells can be used?

2.2.1. in bone marrow transplants to treat people who have certain types of cancer

### 2.3. What can kill the cancer cells?

2.3.1. high doses of chemotherapy

2.3.2. the normal cells in the bone marrow

### 2.4. What can the patient do before he is treated with chemotherapy?

2.4.1. He can undergo a bone marrow harvest in which stem cells are removed from the bone marrow by using a needle which is inserted into the hip bone

2.4.2. What is an alternative way to get stem cells?

2.4.2.1. Stem cells can be harvested from a matching donor.

3.2.1. New node

## 4. the importance of the surface area to volume ratio as a factor limiting cell size

### 4.1. Surface area affects the rate at which particles can enter and exit the cell

4.1.1. If the surface area to volume ratio gets too small then substances won’t be able to enter the cell fast enough to fuel the reactions and waste products will start to accumulate within the cell as they will be produced faster than they can be excreted

## 9. Calculate the linear magnification of drawings and the actual size of specimens in images of known magnification

### 9.1. Magnification

9.1.1. 1. Take measurement of the drawing (width or length)

9.1.2. 2. Take the same measurement from the specimen

9.1.3. 3. Convert units

9.1.4. Place values into the I AM calculation:

9.1.4.1. Magnification = Image size/actual size

9.1.4.2. Image size = actual size x magnification

9.1.4.3. Actual size = image size/magnification