“Ellie’s Dream” By: Michael Whelan

Cells: The Basic Units of Life Chapter 4, Section 1 The Characteristics of Cells

Robert Hooke Robert Hooke was the first person to describe cells: In 1665 he built a microscope. Studied a piece of cork. Discovered tiny boxes and named them “cells.” Also studied slices of living plants.

Hooke’s Microscope and Cork

Cell Size: How big?

Anton van Leeuwenhoek Made his own microscopes. Looked at pond scum. Discovered single-celled organisms called protists.

Anton van Leewenhoek 4. Looked at animal blood and saw red cells. 5. First to see bacteria and yeast.

Activity: Cell Scientists Add some color to the foldables. Cut and glue Robert and Anton onto the top half of page 94. Underneath the tab, explain how each scientist contributed to the study of cells. On the bottom half of page 94: Use your chromebook to research 2 other scientists. Explain who they are and how each contributed to the study of cells. Include a graphic for each also.

The Cell Theory 200 years later . . . Matthias Schleiden: In 1835, concluded that all plant parts were made of cells. Theodor Schwann: In 1839, that all animal tissues were made of cells. Rudolf Virchow: In 1858, stated that all cells could only form from other cells.

The Cell Theory All organisms are made up of one or more cells. The cell is the basic unit of all living things. All cells come from existing cells.

Cell Size: How big?

Cell Size: Some big, some small The yolk of an egg is a big cell. Most are too small to be seen without a microscope.

Cell Size: Some big, some small 3. Cells take in food and get rid of wastes through their outer surface. 4. As a cell gets larger, it needs more food and produces more waste.

Activity: Cell Theory and Beyond Part 1: Cell Theory Foldable Add some color to the front. Cut out and glue near the top of page 96. Write the appropriate part of the cell theory under each tab. Part 2: Two “Other” Theories (bottom of 96) Use your chromebook to research 2 other theories. Give an overview of each. Explain why they are theories. Include a graphic for each.

Prokaryotes Two types: Bacteria and Archaea Single-celled organisms that do not have a nucleus, but they do have DNA.

Prokaryotes 3. They do not have membrane-bound organelles. 4. They have ribosomes and strong, web-like cell walls.

Eukaryotic Cells Largest cells; 10 times as large as prokaryotes. Contain a nucleus, which holds DNA. Contain membrane-bound organelles.

Eukaryotic Cells 4. All living things that are not bacteria or archaea, are eukaryotes. 5. Yeast and amoebas are single-celled eukaryotes.

Eukaryotic Cells 6. Plants and animals are eukaryotes that are made up of many cells.

Yeast and Amoebas

Amoeba Side Note

Comparing

Activity: Pros vs. Eu’s On the tab side of the Venn Diagram, create an illustration representing a prokaryote and a eukaryote. Cut out the foldable as seen in the example. Underneath the tabs, write out 4 to 5 characteristics of pros and eu’s. In the center circle, write out 2 to 3 similarities between the pros and eu’s.

The slides below this one were to be a jumpstart on vocabulary The slides below this one were to be a jumpstart on vocabulary. They were used to introduce the Cornell Notes to your second year classes. You chose not to use them for your third year classes.

Vocabulary Cell: The smallest structural and functional unit of living things (the smallest part of you, that makes you work) Cell membrane: A protective layer that covers the cell’s surface and acts as a barrier. Look to page 117 in textbook for greater detail on these terms (cell membrane, organelles, and nucleus).

Vocabulary Organelles: Structures that have specific jobs inside the cell. Nucleus: An organelle that contains the cell’s DNA and has a role in processes such as growth, metabolism, and reproduction (control center of the cell).

Animal Cell and Plant Cell

Activity: Vocab Foldables Define the following Terms Cell Cell Membrane Organelle Nucleus Glue back side of foldable onto pg 48 Cut along the dotted line Complete the four tasks for each word