Science Lesson 2 Flashcards
What are all living things made of?
Cells
Why did it take so long for scientists to learn about cells?
They were so small
When were cells discovered?
1665
Who built the first microscope to lead to the discovery of cells?
Robert Hooke
What invention allowed us to see details that can’t normally be seen by the naked eye?
Microscope
How does a light microscope work?
a) uses light lenses to enlarge images of an object
How does an electron microscope work?
uses a magnetic field to focus a beam of electrons through an object or objects surface.
What is the first principle of the cell theory?
All living things are made up of one or more cells.
(all living things are made up of atoms which form molecules.)
What is the second principal of the cell theory?
Cells are the smallest unit of life.
(Make up living organisms)
What is the third principal of the cell theory?
All cells come from preexisting cells through the process of cell division.
What are molecules made up of?
Cells
Why are cells important for organisms?
It keeps them alive.
What is a cell theory?
Three observations by three scientists combined to create the cell theory.
What are the two types of living things. (based on the amount of cells they have.)
a) Unicellular Organism
b) Multicellular organism
What are unicellular organisms?
Living things made up of only on cell.
What are multicellular organisms?
living things that are made up of two or more cells
Name the first characteristic of living things.
Living things are organized.
(organized by the different functions they perform)
What is the second characteristic of living things?
Living things grow and develop.
(They increase in size)
What is the third characteristic of living things?
Living things reproduce
What is the fourth characteristic of living things?
Living things respond to stimuli
(response to changes in their environment)
What is the fifth characteristic of living things?
Living things maintain internal conditions or homeostasis.
(maintain steady internal conditions when external conditions change)
What is the sixth characteristic of living things?
Living things use energy
What are the two different types of cells?
a) prokaryotic cells
b) Eukaryotic cells
How is the lining of a prokaryotic cell?
not surrounded by a lining
How is the sizing of a prokaryotic cell?
A prokaryotic cell is small. Smaller than a Eukaryotic cell.
How is the lining of a Eukaryotic cell?
With exceptions, it is surrounded by a lining.
How is the sizing of a Eukaryotic cell?
Large. Larger than the prokaryotic cell.
Is the prokaryotic cell complex or simple?
Simple
Is the Eukaryotic cell complex or simple?
Complex
Does Prokaryotic cell have nucleus and organelles?
No
Does the Eukaryotic cells have organelles and nucleus?
yes
How many cells is in a prokaryotic cell?
Single celled
How many cells is in a Eukaryotic cell?
Both single and multiple cells
What is the original cell, prokaryotic or eukaryotic?
Prokaryotic
How was a eukaryotic cell created?
The eukaryotic cell evolved from the prokaryotic cell.
What are the six kingdoms that organisms can be classified into?
a) Bacteria
b) Archaea
c) Protists
d) plants
e) fungi
f) animals
What are the 3 domains that organisms can be classified into?
1) Domain bacteria
2) Domain Archaea
3) Domain Eukarya
What kingdoms go into Domain Bacteria?
1) bacteria
What kingdoms go into domain archaea?
1) Archaea
What kingdoms go into domain Eukarya?
1) Protists
2) plants
3) fungi
4) animals
What is development?
Genetic instructions tell the organism that it needs to grow
What is growth?
living organisms increase in size
(due to genetic code.)
What are the two types of reproduction?
a) sexual
b) asexual
What is internal stimuli?
reacting to internal events
(hunger)
