You will work in groups of 4 to examine the effects of temperature on enzymes. The enzyme used will be catalase, which is present in most cells and found in high concentrations in liver and blood cells. You will examine the decomposition of hydrogen peroxide by the enzyme.
The system is responsible for Synthesis, distribution, storage and export of material. The organelles included are:
1) Nuclear envelope
2) Rough ER
3) Smooth ER
3) Transport vesicle
5) Golgi apparatus
6) Lysosome
7) Plasma membrane.
Below is a video link reviewing the Functions of the Organelles:
A View Inside the Human Cell. Click to View
The Amoeba
Introduction to the microscope: The importance of the invention. "Seeing is Believing."
The microscope played a significant role in realization that living things were made up of cells.
This realization lead to the Cell Theory:
1) All living things are made of one or more cells,
2) Cells come from pre-existing cells,
3) Nothing less than a cell can show the properties of life.
In 1665 Robert Hook used an early microscope to look at a thin slice of cork, the dead cells of oak bark. What he saw looked like rooms, which he called cells. The microscope was developed from eyeglass markers ideas in the late 1500 who realized that using several glass lenses magnified things.
The Light Microscope allows light to pass through a specimen and uses two lenses to form an image. Light waves are scattered as they pass through material. Therefore light microscopes can magnify up to about 1000t times.
Electron Microscopes use beams of electrons focused my magnetic fields. These offer higher resolutions than light microscope. These are used to only examine non-living cells and tissues. The samples are chemically preserved so that they can be examined in a vacuum. The electrons are placed in a vacuum to prevent them from being scattered.
The chapter 3 test is on Friday, October 8, 2021. Study Guide is available on the high school's web page.
The chapter 3 assignments are due on Thursday, October 7th.
