Gizmos Student Exploration| Cell Types Answer Key| Already Grade A+ Download To Score A

Name: Date:

Student Exploration: Cell Types

Vocabulary: ATP, bacteria, carbon dioxide (CO2), cell, cellular respiration, compound light microscope,

eukaryote, multicellular, muscle cell, neuron, organelle, photosynthesis, prokaryote, protist, red blood cell,

root hair cell, tissue, unicellular, white blood cell

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

1. How do you know if something is alive? Describe some of the characteristics of living things.

Beings that are alive have the ability to reproduce, evolve and maintain a metabolism(be

able to produce energy from gaining energy)

2. Humans, plants and mushrooms are all alive. What do these organisms have in common?

They can all reproduce/multiply, evolve and have some sort of metabolism

Gizmo Warm-up

In the Cell Types Gizmo, you will use a light microscope to compare and contrast

different samples. On the LANDSCAPE tab, click on the Elodea leaf. (Turn on Show

all samples if you can’t find it.) Switch to the MICROSCOPE tab to observe the

sample as it would appear under the microscope. By default, this microscope is using

40x magnification.

1. Drag the Coarse focus slider until the sample is focused as well as possible. Then, improve the focus

with the Fine focus slider. What do you see? I see the representation of

the eucaryote cells in the leaf, which are a little rectangular and green, because of the

chlorophyll

2. Select the 400x magnification. If necessary, adjust the fine focus. Now, what do you see?

Now, I can see the cells closer. You can even see the chloroplasts (the smallgreen

dots) and the nucleus

The individual chambers you see are cells, the smallest functional unit of an organism.

Introduction: Complex organisms are made up of smaller units, called cells. Most cells are too small to

be seen by the naked eye. Microscopes are used to magnify small objects, so here you will use a

compound light microscope to observe the cells of different organisms.

Question: What are similarities and differences between cells from different organisms?

1. Match: Read about each microscope part. Match the description to the part on the diagram.

 B Stage: Platform where a slide is placed.

 A Eye piece: Lens at the top of the microscope that the

user looks though. This lens most commonly magnifies a

sample by 10x.

 C Coarse focus knob: Large knob that moves the

stage up and down to focus the sample.

 D Fine focus knob: Small knob that moves the stage

over a short distance to refine the focus.

 E Objective lens: A second lens that further magnifies

the sample. Microscopes usually have several objective

lenses with different magnifications. The total

magnification is the product of the eyepiece magnification

and the objective lens magnification.

 F Slide: A rectangular piece of glass upon which a

sample is mounted for viewing under a microscope.

2. Manipulate: With 40x selected, use the Coarse and Fine focus sliders to focus on thesample.

Then, choose 400x and focus on the sample using the Fine focus slider.

A. Which focus knob is easier to use at 40x? Coarse 400x? Coarse

B. Turn on Show labels. What structures can you see in human skin cells?

The nucleus, cytoplasm and cell membrane.

C. Turn off Show labels and turn on Show scale bars. The scale bar has a width of 20

micrometers, or 20 μm. (There are 1,000 micrometers in a millimeter.)

Using the scale bar, about how wide is a human skin cell? About 30 um

Get the Gizmo ready:

• On the LANDSCAPE tab, click on the woman’s

right arm to choose the Human skin sample.

• Select the MICROSCOPE tab.

Activity A:

Observing cells

Powered by TCPDF (www.tcpdf.org)