Scientists
Robert Hooke
True or False?
All cells arise only from preexisting cells.
True
Organisms that are made up of a single cell.
Ex. Bacteria
A commonly used tool in biology to examine objects, cells and specimens.
Light Microscope
A large membrane-bound structure containing the cell's genetic material, the DNA.
Nucleus
Scotish botanist, identified the nucleus in cells.
Robert Brown
How many cells does an adult human have?
estimated between 70 and 100 trillion cells.
Organisms that are made up of more than one cell.
Ex. Animal
Multicellular
Give one structural parts of a microscope.
Answers may vary:
1. Head
2. Arm
3. Body tube
4. Base
5. Stage
6. Stage Clips
Fill in the blanks.
Organims whose cells have nuclei are called ____________________.
Eukaryote
In 1839, a scientist proposed that all animals are also composed of cells.
Theodor Schwann
Fill in the blanks:
1. All _____________________ are composed of one or more cells
organisms
Give one example of a cell.
Answers may vary:
1. Nerve cells
2. Muscle cells
3. Skin cells
4. Blood cells
5. Animal/Plant cells
Etc.
Give one magnifying parts of a microscope.
Answers may vary:
1. Eyepiece
2. Low power objective lens (4x)
2. High power objective lens (10x - 43x)
3. Oil immersion lens (100x)
A whiplike structure that propels the prokaryote, allowing it to move.
Flagellum
In 1838, a German botanist proposed the idea that all plants are made of cells, laying the foundation for the cell theory.
Matthias Jakob Schleiden
What is the basic structural and functional unit of all organisms?
Cell
What are the two major categories of life?
Unicellular and Multicellular organisms.
What part of the microscope holes the objective lenses?
Revolving nosepiece
What does DNA mean?
deoxyribonucleic acid (DNA)
In 1675, a Dutch scientist invented a more functional microscope that opened up new world of scientific possibilities.
Antonie van Leeuwenhoek
Why do scientist use the microscope?
These cells are not observed with the naked eye, so it is important for scientist to know how to use a microscope to observe and study the cells.
True or False?
Cells in unicellular organisms are differentiated or specialized to perform specific functions.
False.
Correct statement: Cells in multicellular organisms are differentiated or specialized to perform specific functions.
This controls the amount of light that passes through the specimen being observed.
Diaphragm
The building blocks of higher forms of organisms.
Eukaryotic cells