Living Systems - Science 10IB

How do you convert milimeters to micrometers?

Shift by 3 decimal points

What is a TEM?

“Transmitting Electron Microscope”

-Electrons pass through

-See inside specimen

-Images look 2D

What is an SEM?

“Scanning Electron Microscope”

-Electrons bounce off outer surface

-See outside

-Images look 3D

What are some advantages of a COMPOUND LIGHT MICROSCOPE?

-Living specimens

-”Cheap”

-Portable

-Can see colour

What are some advantages of an ELECTRON MICROSCOPE?

-High resolution

-Smaller specimens

-Option for 2D or 3D

-More details

What is the formula for ESTIMATED SIZE?

FOV diameter / Fit #

What is the formula for SCALE?

Estimated size(micrometers) / Drawing size (cm)

What is the formula for MAGNIFICATION?

Drawing size(micrometer) / Estimated size (micrometer)

What is the fov size on LOW power?

4 000 micrometers

What is the fov size on MEDIUM power?

1 600 micrometers

What is the fov size on HIGH power?

400 micrometers

Which organelles are only found in ANIMAL cells?

-Lysosomes

-Centrioles

Which organelles are only found in PLANT cells?

-Cell wall

-Chloroplast

-Vacuole

What did ARISTOTLE do?

Spontaneous generation

What did REDI do?

-Meat jar experiment

-Disproved spontaneous generation

What did HOOKE do?

-Coined the term “cell”

What did LEEUWENHOEK do?

-First person to see bacteria, protozoa, and sperm

-Called them “animalcules”

What did BROWN do?

-Observed first organelle(nucleus)

What did SCHLEIDAN do?

-Found nucleus was most important

What did SCHWANN do?

-Found the cell was the most basic unit of life

-Believed in free-cell formation

What did VIRCHOW do?

-Believed calls arise from pre-existing cells

-Couldn’t prove it

What did PASTEUR do?

-Proved Virchow’s idea

-Microbes occur from contamination

Who is credited for the cell theory?

-SCHLEIDAN

-SCHWANN

-VIRCHOW

What is the cell theory?

1. All living things are made of one or more cells

2. Cells are the most basic functional unit

3. Cells come from pre-existing cells

What is a Prokaryotic cell?

-No nucleus

-DNA is free floating

-ex. bacteria

What is a Eukaryotic cell?

-Has true nucleus

-Larger and complex

-Animals, plants, fungi, protists

What is a VIRUS?

-Has DNA

-Requires a host to reproduce

What is a PRION?

-Small protein

-Causes disease

What are the characteristics of all living organisms?

R - Reproduce

O - Organized

G - Grow

E - Energy

R - Respond