Unit 3 (part 1) Study Guide (ANSWERS)
Objectives: Can you….?
List the scientists who contributed to our knowledge of the cell
List the 3 components of the cell theory
Compare prokaryote to eukaryote cells
Label a plant and animal cell
Describe the functions of all cell organelles
Early Contributions:
Robert Hooke - The first person to see cells, he was looking at cork and noted that he saw "a great many
boxes. (1665)
Anton van Leeuwenhoek - Observed living cells in pond water, which he called "animalcules" (1673)
Theodore Schwann - zoologist who observed that the tissues of animals had cells (1839)
Matthias Schleiden - botonist, observed that the tissues of plants contained cells (1845)
Rudolf Virchow - also reported that every living thing is made of up vital units, known as cells. He also
predicted that cells come from other cells. (1850)
The Cell Theory:
1. Every living organism is made of one or more cells.
2. The cell is the basic unit of structure and function.
3. All cells arise from pre-existing cells.
Cell Features: (All cells have these characteristics)
Ribosomes - make protein for use by the organism
Cytoplasm - jelly-like goo on the inside of the cell
DNA - genetic material
Cell membrane - outer boundary of the cell, some stuff can cross the cell membrane.
CELL MEMBRANE (or plasma membrane)
The cell membrane is semi-permeable (selectively permeable). It is composed of a double layer of
phospholipids with embedded proteins
Jobs of the cell membrane



Isolate the cytoplasm from the external environment
Regulate what comes in and what goes out.
Communicate with other cells
Phospholipids (fats) contain a hydrophilic head and a nonpolar hydrophobic tail, which creates a
barrier.
Prokaryotic Cells
Prokaryotes are very simple cells, probably first to inhabit the earth. They are always single celled
organisms. They have a cell wall.
Prokaryotic cells do not contain a nucleus. Their DNA is floating in the cytoplasm in a circular loop
called a nucleoid.
Bacteria are prokaryotes.
Label the Bacteria
The word "prokaryote" means "before the nucleus"
Other features found in some bacteria:
Flagella - used for movement
Pilus - small hair like structures used for attaching to other cells
Capsule - tough outer layer that protects bacteria, often associated with harmful bacteria
Eukaryotic Cells (Plant and Animal Cells)
Eukaryotic cells are more advanced cells. These cells are found in plants, animals, and protists (small
unicellular "animalcules").
The eukaryotic cell is composed of 4 main parts:
Cell membrane - outer boundary of the cell
Cytoplasm - jelly-like fluid interior of the cell
Nucleus - the "control center" of the cell, contains the cell's DNA (chromosomes)
Organelles - "little organs" that carry out cell functions
Cell Structures - Organelles
1. The Nucleus




Usually found at center of cell
Has a nuclear membrane which contains nuclear pores
Contains cell's DNA in one of 2 forms
o chromatin- DNA bound to protein (non-dividing cell)
o chromosomes- condensed structures seen in dividing cell
Also contains an organelle called nucleolus - which makes the cell’s ribosomes
2. Mitochondria: Energy center or "powerhouse" of the cell. Turns food into useable energy
(ATP)
3. Ribosome - make protein, located on the rough endoplasmic reticulum and throughout the
cytoplasm
4. Golgi Apparatus - processing, packages and secretes proteins; proteins are transported in
vesicles
5. Lysosome - contains digestive enzymes that can break things down, also called a "suicide
sac" because the rupturing of the lysosome will cause the cell to destroy itself
6. Endoplasmic Reticulum - Transport, "intracellular highway". Ribosomes are positioned
along the rough ER, protein made by the ribosomes enter the ER for transport.
Smooth ER - no ribosomes
Rough ER - contains ribosomes
7. Cytoskeleton - helps maintain the cells shape; supports the cell and aids in cell movement.
It is composed of microtubules which are made by the centrioles.
8. Vacuole - storage area for water and other substances, plant cells usually have a large
central vacuole
Plant Cell: Has all the components of animal cells with some additional structures.
9. Chloroplast - Uses sunlight to create food, photosynthesis (only found in plant cells),
contains green pigment chlorophyll
10. Cell Wall - outside the cell membrane of plants and some bacteria, the cell wall serves as
support
11. Central vacuole - large water container, helps maintain a turgor (stiffness) in the plant
Cell Structures and Processes
1. _____Mitochondria________________
2. ______Centrioles_______________
3.__Lysosomes___________
4. ____Cytoplasm_________
5. ________Nucleolus______
6. Nuclear Membrane
7. _____Chromosomes_
8. ____Flagella____
9. Rough ER___
10. _____Golgi Apparatus
11. ___Microtubules______
12. _GolgiBodies/Vesicle____
13. ___Ribososmes_____
14. ___Smooth ER______
15. ___Cell Membrane_____
16. Which organelle contains its
own DNA? Mitochondria
17. What is the difference between smooth and rough ER? Rough ER – Contains ribosomes and
makes proteins/lipids; smooth ER makes and distributes products (calcium); also detoxifies poisons
A. ____Nucleus________
B. ____Chromosomes___________
C. ___Nucleolus ___________
D. ___ Nuclear membrane _________
E. _____Rough ER________
F. _____Smooth ER_____________
G. _____Vacuole_____________
H. ______Microtubules/Cytoplasm______
I. _____Chloroplasts______
J. ______Cell Wall_________
K. _______Cell Membrane___________
L. ____Mitochondria__________
M. ____Vesicle/Golgi Body___________
N. ______Golgi Apparatus_________
Structures found in plants, but not animal cells:
Cell Wall, Chloroplasts, Large Central
Vacuole
1. What part of the cell is responsible for breaking down and digesting things?
ribosomes
lysosomes
endoplasmic reticulum
vacuole
2. Identify the organelle pictured.
chloroplast
endoplasmic reticulum
golgi apparatus
mitochondria
3. What part of the cell serves as the intracellular highway?
endoplasmic reticulum
golgi apparatus
cell membrane
mitochondria
4. Which of the following would you NOT find in a bacterial cell?
DNA
cell membrane
golgi apparatus
ribosomes
5. Which of the following is found in plant cells, but not animal cells?
cell wall
vacuole
mitochondria
endoplasmic reticulum
6. The jellylike interior of the cell is called the:
vacuole
cytoplasm
cytoskeleton
nucleus
7. Identify the organelle.
golgi apparatus
endoplasmic reticulum
mitochondria
lysosome
8. What part of the cell makes proteins?
ribosomes
mitochondria
lysosomes
vacuole
9. Where are ribosomes usually located in animal and plant cells?
inside the nucleus
near the cell membrane
on the endoplasmic reticulum
inside the vacuole
10. What part of the cell serves to process, package and export proteins?
mitochondria
endoplasmic reticulum
nucleolus
golgi apparatus
Comparing Cells
Use what you know about each type of cell (reference pictures if needed), and place a
check in the box if the cell has that characteristic or structure.
Bacteria
Plant
Cell Wall
x
x
Cell Membrane
x
x
x
x
x
x
x
Nucleus
Cytosol
x
Central Vacuole
x
Chloroplast
x
Mitochondrion
x
Animal
x
Protein Production(JUST A LITTLE EXTRA)
The cell is like a factory. Its product is protein which goes to body to serve different
functions.
1.
2.
3.
4.
DNA has instructions to build; protein
These instructions are sent to ribosomes
The ribosomes build protein and send it through ER
The proteins are delivered to& golgi where they are completed and tagged for
export outside the cell