CELL THEORY Flashcards
The primary building blocks of life.
cell
They come in all shapes and sizes.
cell
Some cells are so small and can only be observed under a _____. But some are large enough to be held, like _____!
microscope
eggs
The smallest cell is the
_________ ________,
a disease-causing bacteria
in birds.
Mycoplasma gallicepticum
Mycoplasma gallicepticum can be as small as _______
0.3 nanometers
The largest cell is the
_____ ___, which
can reach up to _ _____ in diameter.
ostrich’s egg
6 inches
Cells were first recorded by
____ ______ around _____.
Robert Hooke
1665
Robert Hooke was improving the design of a microscope when he decided to observe a piece of ____.
cork
[Discovery of Cells]
Up close, Hooke saw _____
structures. These are what we
now know as ____ _____.
box-like
cell walls
[Proponents of Cell Theory]
____ ___ ______, in 1674, observed the __ ____ using the __________ ______.
Anton van Leeuwenhoek
living cell
Leeuwenhoek Microscope
[Proponents of Cell Theory]
Years later, ____ _____, in 1883 successfully discovered the
nucleus.
Robert Brown
[Proponents of Cell Theory]
Years later, Robert Brown, in 1883 successfully discovered the
_____.
nucleus
[Proponents of Cell Theory]
In 1834, ____ ______, a French biologist discovered the
fluid content of the cell, which he called as sarcode.
Felix Dujardin
[Proponents of Cell Theory]
In 1834, Felix Dujardin, a French biologist discovered the
____ content of the cell, which he called as _______.
fluid
sarcode
[Proponents of Cell Theory]
_____ _______, a German botanist, revealed in
1838 that all plant tissue was made up of cells.
Matthias Schleiden
[Proponents of Cell Theory]
Matthias Schleiden, a German botanist, revealed in
1838 that all ___ ______ was made up of cells.
plant tissue
[Proponents of Cell Theory]
In the year 1839, __ ___ ________, or __ ______, named the fluid content of cell as protoplasm.
Jan Evangelista Purkinje
J.E. Purkinje
[Proponents of Cell Theory]
In the year 1839, Jan Evangelista Purkinje, or J.E. Purkinje,
named the fluid content of cell as ______.
protoplasm
[Proponents of Cell Theory]
In 1839, ___ _______ identified animal cells as
being comparable to plant cells. He and Schwann are
thus credited with the unifying cell theory that ushered in
a new era of productive exploration in cell biology.
Theodor Schwann
[Proponents of Cell Theory]
In 1839, Theodor Schwann identified __ _____ as
being comparable to plant cells. He and Schwann are
thus credited with the unifying cell theory that ushered in
a new era of productive exploration in cell biology.
animal cells
[Proponents of Cell Theory]
In 1845, ___ ____ _____ proposed that cell is the basic unit of life.
Carl Heinrich Braun
[Proponents of Cell Theory]
In 1845, Carl Heinrich Braun proposed that cell is the
_______________.
basic unit of life
[Proponents of Cell Theory]
A doctor and pathologist, ___ ______ in the year 1858 recognized that all cells came from pre-existing cells. He proposed the Theory of Biogenesis.
Rudolf Virchow
[Proponents of Cell Theory]
A doctor and pathologist, Rudolf Virchow in the year 1858 recognized that all cells came from _______ ____. He proposed the ______ __ ______
pre-existing cells
Theory of Biogenesis.
Hooke’s discovery led to the development of ________
Cell Theory
German scientists ___ ______, _____ ______, and ____ ________ consecutively developed the classical cell theory.
Theodor Schwann
Matthias Schleiden
Rudolph Virchow
It is a principle in Biology that is fundamental to our understanding of all living organisms, summarized into three tenets.
Cell Theory
Cell Theory
- All organisms are made up of cells.
- All life functions of an organism happen within the cell.
- All cells come from other cells that are already existing.
[CELL THEORY]
- All organisms are _____________
made up of cells.
[CELL THEORY]
1. All organisms are made up of cells.
A living organism can be made of just one cell (like an _____) or trillions (like the ___ _____!)
amoeba
human body
[CELL THEORY]
- All life _____ of an organism happen ____ ___ _____.
functions
within the cell
[CELL THEORY]
2. All life functions of an organism happen within the cell.
That’s why cells are often referred to as the ____ __ ___ ____ To be considered a life form, something
needs to have __ __ __ _____.
basic unit of life.
at least one cell
[CELL THEORY]
- All cells come from ______________
other cells that are already existing.
[CELL THEORY]
3. All cells come from other cells that are already existing.
A cell cannot exist _____ nor _____________
spontaneously
come out of a nonliving thing.
[Molecular Composition of Cell]
____ accounts for about ____ of the weight of the cell which is essential in our life.
Water
70-75%
[Molecular Composition of Cell]
The remaining ____ of the cell weights account for the ___ ______
25-30%
organic compounds.
[Molecular Composition of Cell]
These organic compounds are:
nucleic acid, proteins, lipids, and carbohydrates.
[Molecular Composition of Cell]
The rest of the cell weight is from ____ _____ which are the cation, anion, and other electrolytes.
inorganic compounds
[Molecular Composition of Cell]
The rest of the cell weight is from inorganic compounds which are:
the cation, anion, and other electrolytes.
two types of cell
Prokaryotic and Eukaryotic
________ _____ were
the first to appear and
occupied Earth for nearly 1.5
billion years.
Prokaryotic cells
Evidence suggests that ______ ____ evolved from some of these
____ ____ around 1.8
billion years ago.
eukaryotic cells
ancient cells
All cells have four
components in common:
- Plasma Membrane
- DNA
- Cytoplasm
- Ribosome
a _____ ____ which is an outer covering that separates the cell’s interior from its surrounding
environment.
plasma membrane
the cell’s genetic material
DNA
____, which is a jelly-
like region within the cell where other cellular components are found
cytoplasm
synthesize proteins
ribosomes
