Biology (Holt)

Before You Begin

You can see many cell parts with a

.In animal cells, the ,

,, ,and

can be seen. In plant cells, the

and can also be seen.

Stains add color to cell parts and make them

more visible with a light microscope. A stain

can even make the

visible. In this lab, you will use a light micro-

scope to examine animal and plant cells.

1.Write a definition for each boldface term in

the paragraph above.

2.Why might a stain be needed to see cell

parts under a microscope?

3.Based on the objectives for this lab, write a

question you would like to explore about

cell structure.

Procedure

PARTA:Animal Cells

1. Examine a prepared slide of human
   epithelial cells under low power with
   a compound light microscope. Find cells
   that are separate from each other, and
   place them in the center of the field of
   view. Switch to high power, and adjust the
   diaphragm until you can see the cells more
   clearly. Identify as many cell parts as you
   can. Note: Remember to use only the fine
   adjustment to focus at high power.
   2.Draw two or three epithelial cells as they
   look under high power. Label the cell mem-
   brane, the cytoplasm, the nuclear envelope,
   and the nucleus of at least one of the cells.
   Make a second drawing of these cells as
   you imagine they might look in the lining
   of your mouth.

endoplasmic reticulum

cell wall chloroplasts

vacuoles

cell membrane nucleus nucleolus

microscope cytoplasm

light

Skills Practice Lab

SKILLS

• Using a compound
  microscope


• Drawing

OBJECTIVES

• Identifythe structures
  you can see in animal
  cells and plant cells.


• Compare and
  Contrast the structure
  of animal cells and
  plant cells.

Studying Animal Cells and Plant Cells

MATERIALS

• compound light microscope


• prepared slide of human
  epithelial cells from the
  lining of the mouth


• safety goggles


• lab apron


• sprig of Elodea


• forceps


• microscope slides and
  coverslips


• dropper bottle of Lugol’s
  iodine solution Plant cells

70 CHAPTER 3Cell Structure

Magnification: 530

ChemSafety

CAUTION: Always

wear safety gog-

gles and a lab apron to protect

your eyes and clothing.

CAUTION: Do not touch

or taste any chemicals.

Know the location of the emer-

gency shower and eyewash

station and how to use them.

If you get a chemical on your

skin or clothing, wash it off at

the sink while calling to the

teacher. Notify the teacher of a

spill. Spills should be cleaned

up promptly, according to your

teacher’s directions.

CAUTION: Glassware is

fragile. Notify the teacher

of broken glass or cuts. Do not

clean up broken glass or spills

with broken glass unless the

teacher tells you to do so.

1A 1B 2A 2B 2C 5A