Cell Organelles and Their Jobs (Part 2)

What You'll Learn

Mutations are changes in DNA sequence that can occur randomly. Most mutations have no effect, some are harmful, and a few may be beneficial and help a species adapt.

Key Words

fossil record
species
heredity

Materials Needed

microscope (or magnifying glass)
slides
onion skin
iodine stain

Safety First

Dispose of materials properly after the experiment.
Handle glass items carefully to avoid breakage.

Steps

Step 1 — Read

Look at the vocabulary words and write a definition for each in your own words.

Step 2 — Do

Prepare a wet-mount slide of an onion skin and observe it under a microscope (or magnifying glass). Draw and label the cell wall, cell membrane, and nucleus.

Step 3 — Observe

Use your senses (except taste) to describe what you notice.

Step 4 — Record

Write a summary of your findings in 3-5 sentences.

Check Your Understanding

Question 1

1 of 3

What organelle produces energy for the cell?