“The Cell” Flashcards
What is the smallest working unit of a living thing?
A cell
A cell is the basic structural and functional unit of all living organisms.
Who first observed cells?
Robert Hooke
Robert Hooke is credited with the discovery of cells in the 17th century.
What are the two main types of living things based on cell composition?
- Unicellular
- Multicellular
Unicellular organisms consist of a single cell, while multicellular organisms are composed of many cells.
Give an example of a unicellular organism.
Bacteria
Bacteria are single-celled organisms that can exist independently or in colonies.
Give an example of a multicellular organism.
Humans
Humans are complex organisms made up of trillions of cells.
List the characteristics of life.
- Movement
- Reproduction
- Sensitivity
- Feeding
- Excretion
- Growth
These characteristics define living organisms and their interactions with the environment.
What is the purpose of the coarse focus wheel on a microscope?
To bring the object roughly into focus
The coarse focus wheel is used to make large adjustments to the focus.
What does the fine focus wheel do?
Brings the object into sharp focus
The fine focus wheel allows for precise adjustments to the focus of the specimen.
What is the function of the objective lens in a microscope?
Magnifies the specimen
The objective lens is crucial for viewing details in a specimen.
How do you calculate the total magnification of a microscope?
Eyepiece magnification x Objective lens magnification
This formula helps determine how much larger the specimen appears compared to its actual size.
Fill in the blank: Living things require and _______ food.
eating
Feeding is essential for energy and growth in living organisms.
True or False: All cells can be seen without a microscope.
False
Cells are microscopic and require a microscope for observation.
