Biology Cell Unit Homework Packet #1



Biology Cell Unit Homework Packet #2

Name Hour

DUE:

|HW #2 | | |

|Cell Size |Hypothesis |____ |

|Lab |Data Table |____ |

| |Graph |____ |

| |Questions |____ |

| | | |

|HW #3 | | |

|Cell Parts |Accuracy | ____ |

|Reading | | |

|Questions | | |

| | | |

|HW #4 | | |

|Create Your |Completion |____ |

|Own Cell |Accuracy |____ |

|Analogy | | |

| | | |

| | | |

| | | |

| | | |

| | |_______ / 5 possible points |

Homework #2: Cell Size Lab

(from Biology: Living Systems, pg. 120-121)

Introduction: In this lab, you will determine the size of plant and animal cells. Your teacher will supply a millimeter ruler and a variety of plant and animal cells. You can measure the diameter of the field of view under low power with your millimeter ruler. It will be easier for you to make your measurements in millimeters. However, because cells are very small, convert your answers to micrometers. There are 1000 micrometers ((m) in 1 millimeter (mm). (For example, 1.8 mm is equal to 1800 µm).

Problem: How big are cells?

Materials: Microscope

Ruler

Slides of plant and animal cells

Calculator

Methods: 1. Take out your microscope and properly set it up as we did in the

Microscope Lab.

2. Set your microscope to LOW power.

3. Record the Eyepiece and Objective magnification in Table 1.

4. Mathematically, determine the Overall magnification.

5. Use your ruler to measure the diameter of the field of view in

millimeters. Record your answer in Table 1.

6. Convert the diameter in millimeters to micrometers. Record your answer in Table 1.

7. Repeat steps 2 and 3 for MEDIUM and HIGH power.

8. Obtain a slide and estimate the number of cells across the field of view as in Figure 1. Record your answer in Table 2.

9. Individual cell size can be determined using the following equation:

(Field of view diameter) ÷ (# of cells)

Use your math skills to determine the estimated cells of each individual cell in micrometers. Record your answers in Table 2.

Data and Observations:

TABLE 1. Measuring the field of view

|Setting |Eyepiece magnification |Objective magnification |Overall magnification |Field of View Diameter|Field of View |

| | | | |(mm) |Diameter ((m) |

|Ex. Super Low |10x |2x |20 |10 mm |5,000 |

|LOW | | | | | |

|MEDIUM | | | | | |

| | | | | | |

|HIGH | | | | | |

| | | | | | |

TABLE 2. Estimating the size of cells

|Cell Type |Microscope Setting |# of cells |Estimated Cell Size ((m) |

|EXAMPLE: Mosquito wing |Super Low |10 | |

|Frog Blood |High | | |

|Testes |High | | |

|Corn Stem |Medium | | |

|Onion Root |High | | |

Analysis and Conclusions:

- Prepare a bar graph that shows the relationship of cell type (X-axis) to cell size (Y-axis). Be sure to include a title, key, and labeled axis (X and Y) on your graph. DO NOT INCLUDE THE MOSQUITO WING! Neatness counts.

| | |

|Mitochondria |Creates energy for the cell |

|Ribosome |Important in the creation of proteins |

|Chromosomes |Contains the hereditary information |

|Vacuole |Storage of water, undigested food, and or wastes |

|Nuclear Membrane |Semi-permeable membrane surrounding nucleus |

|Lysosome |Storage of digestive enzymes |

|Chloroplasts |Contains chlorophyll to attract sunlight energy |

|Golgi Body | |

1. Fill in the following Venn Diagram to compare and contrast animal and plant cells. Which cell parts do they have in common? Which cell parts are unique?

2. Predict which organ in your body is composed of cells that contain the greatest number of mitochondria. Explain your answer.

• Answers will vary. Any cells that require a great amount of energy will have many mitochondria.

3. In class we learned that plants have large vacuoles. Why would plant cells have larger vacuoles than animal cells?

• Vacuoles are used for storage. Because vacuoles store liquid, they help to keep cells stiff. Storage of water also allows cell to get big without using much energy (cytoplasm is metabolically costly).

Homework #4: CREATE YOUR OWN CELL ANALOGY

Over the past few days, you have been learning about cells and comparing them to a factory. To help you get ready for tomorrow’s quiz, I would like you to develop a different comparison. What else is a cell like? How would those parts fit into that analogy?

Work with your partner to develop your own analogy using the chart below. You must be able to use at least 10 of the cell parts that we described in class. In the first column, write the name of a cell part. In the second column, write the job the cell part would have in your analogy. In the third column, give your rationale or reason why that particular cell part would do that job in your analogy.

A cell is like a Answers will vary.

|Cell Part |Job |Rationale |

| | | |

| | | |

| | | |

| | | |

| | | |

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| | | |

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-----------------------

5

4

2

10

9

8

7

6

3

1

JUST Animal Cells

Just PlANT Cells

BOTH

10x

10x

4x

10x

10x[pic]

40x

40x

100x

400x

Cell membrane

Mitochondria

Nucleus

Chromosomes

ER

Golgi body

Ribosomes

Chloroplasts

Cell wall

Large vacuoles

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