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Parts and Functions of the cell, Diffusion, Active and Passive Transport, Osmosis

Cell Theory

a. Every living organism is made of one or more cells
b. The smallest organism are single cells, and cells are the functional units of multicellular organisms
c. All cells arise from pre-existing cells

Physical Attributes of a Cell

a. Cell size= 1-100um
b. Volume and surface area are limited in order for the cell to function efficiently

Types of Cells

1. Prokaryote
2. Eukaryote

Prokaryotic Cell

less than 5um, that contain a simple internal structure with no membrane bound nucleus or organelles, with some internal structures that capture light

Parts of a Prokaryotic Cell

1. cell wall (not all) - protective covering
2. cytoplasm - intracellular fluid that contains ribosomes, food granules, and plasmids
3. plasma membrane - phospholipid bilayer that is selectively permeable
4. ribosomes - protein synthesis
5. nucleoid - long strands of DNA that carried essential info. in haploid form
6. Plasmids - small rings of DNA that contain useful non-essential information
7. Flagella - protein extension that allows the cell to move
8. Pilli - protein strands that can transfer plasmids to other cells or further enhance adhesion
9. Slime Layer or Capsule - polysaccharide membrane on the outside of cell wall that allows it to adhere to stuff.

Types of Prokaryotes

1. Bacteria - single celled organisms found everywhere
2. Archaea - single celled organisms found in extreme environments

Cell Shape

1. Rod-shaped - bacillus, Escherichia ecoli
2. Spiral - Treponema pallidum, syphilis
3. Spherical - Cocci, Streptococcus pneuomoniae


larger cells that make single and multicellular organisms, contain membrane bound organelles and a nucleus

Parts of Eukaryotic Cell

1. Cell Wall (may or may not)
2. Cytoskeleton
3. Plasma Membrane
4. Cytoplasm
5. Endoplasmic Reticulum
a. Rough ER
b. Smooth ER
6. Golgi Apparatus
7. Vacuoles
8. Lysosomes
9. Ribosomes
10. Mitochondria
c. Cristae
d. Matrix
11. Centrioles
12. Chloroplasts
a. Stroma
b. Grana
13. Flagella
14. Cilia
15. Plastids
16. Central vacuole
17. Nucleus
a. Nucleolus
b. Nuclear Envelope
c. Nuclear Pores
d. Chromosomes
e. Chromatin

Cell Walls

protects and supports cell
a. Plant cells are composed of cellulose and another polysaccharide
b. Fungi are composed of chitin and polysaccharides
c. are porous to allow small molecules to pass through ie) Oxygen, CO2 , Water

Types of Eukaryotic Cell

1. Animals - multicellular, heterotrophs
2. Plants - multicellular, autotrophs
3. Fungi - single and multicellular, Heterotrophs
4. Protists - single cellular, autotroph and heterotroph


long DNA strands in nucleus


DNA and protein material to keep DNA wound in tight linear paths

Nuclear Pores

small proteins that surround the perforated areas of nuclear envelope
i. Allows the passage RNA and proteins

Nuclear Envelope

double membrane with pores regulates the passage of material in and out


synthesizes ribosomes

Parts of the Nucleus

1. nuclear Pores
2. nuclear envelope
3. nucleolus
4. Chromosomes
5. Chromatin

Central Vacuole

contains water and wastes, provides turgor pressure to support the cell, maintains water balance, store hazardous wastes, nutrients, pigments


stores food, pigments


move cell through fluid or moves fluid past cell, arise from plasma membrane anchored to basal body.
a. Contains 9 pairs a 2 pairs in the center of microtubules


move cell through fluid, arise from plasma membrane anchored to basal body.
a. Contains 9 pairs a 2 pairs in the center of microtubules


maintains changing of cell shape, provides movement within and outside of cell, and facilitates in mitosis
a. Composed of proteins
i. Organelles attach to protein fibers
ii. 3 Types - hold cells together
1. Thin microfilaments
2. Medium sized intermediate filaments
3. Thick microtubules

Thin microfilaments

globular pearls, allows cells to change shape and aids cytoplasmic division in animal cells.

Thick Microtubules

globular, allow movement of chromosomes during cell division, basal body, and major component of cilia or flagella.

Medium Interfilaments

Proteins, provides supporting framework within the cell

Plasma Membrane

communication with other cells (glycoproteins), regulates exchange and reactions between essential substances (carrier proteins), creates attachments within/between cells (fibrous and globular proteins), and isolates cell's contents from external environment (bilayer)
a. Composed of a phospholipid bilayer, polar heads pointed away from each other, and non-polar tails that point towards each other.
b. All phospholipids bond together.
c. Some phospholipids have kinks and those kinks regulate the amount of fluidity in the cell. # of kinks allows the cell to live in different temperature climates.
d. Cholesterol is present in animal membranes stabilizes, affecting and reducing permeability.
e. Small, usually non-polar molecules can diffuse through cell like water, CO₂, O₂, and larger lipid soluble molecules. Ions, amino acids, and sugars cannot easily pass through.
f. Considered to have a fluid mosaic model: the bilayer has the ability to move while the proteins suspend like patchwork. Allows the membrane to be dynamic and structural at the same time. Allows for cellular shape change.


contains fluid that houses all the organelles in the cell
a. Contains water, salts, and organic materials
b. Site of most metabolic activities

Endoplasmic Reticulum

interconnected membranes that form a labyrinth
Two Types
a. Rough ER: houses ribosomes that synthesize proteins
b. Smooth ER: synthesizes lipids like hormones, cholesterol, detoxifies drugs

7. Vacuoles:
8. Lysosomes

9. Ribosomes
10. Mitochondria
11. Centriole
12. Chloroplasts

Golgi Apparatus

modifies and packages proteins like adding carbohydrates to make glycoproteins, break s proteins, and sorts them to their destination


transport secretory molecules, may contain food for phagocytosis


contains intracellular digestive enzymes that digests macromolecules
a. Done through fusing with food vacuole


makes proteins


produces energy in the cell
a. Extracts energy from food molecules and chloroplasts to produce energy in the form of ATP
b. Energy extraction methods involve anaerobic and aerobic reactions

Parts of Mitochondria

c. Cristae: folded inner membrane
d. Matrix: cytoplasm of mitochondria


produce microtubules of cilia and flagella


performs photosynthesis

Parts of Chloroplasts

Stroma - cytoplasm of Chloroplasts
Grana - stacked Thylakoids
Thylakoids - green chlorophyll that are charged with sunlight and the electrons release energy

Cell Types

1. Unicellular - organisms that contain only 1 cell ie) protists
2. Multicellular - organisms that contain more than 1 cell ie) humans

Role of Proteins

mosaic portion of the fluid mosaic model of plasma membranes
a. Proteins are embedded within lipid bilayer

Types of Proteins

i. Receptor Proteins
ii. Recognition Proteins
iii. Enzymatic Proteins
iv. Attachment Proteins
v. Transport Proteins

Receptor Proteins

trigger cellular responses upon binding of molecules such as hormones

Recognition Proteins

aka glycoproteins, ID tags for cells

Enzymatic Proteins

catalysts for cells to aid in breaking and forming molecules

Attachment Proteins

anchor cell membrane to cytoskeleton, to proteins in ECF, and other cells

Transport Proteins

regulate movement of water soluble molecules through plasma membrane
1. Two Types
- Channel Proteins
- Carrier Proteins

Channel Proteins

form channels whose central pores allow water and specific ions to pass through
i. Ie) K+ and Cl-

Carrier Proteins

have binding sites that can temporarily attach to specific molecules and then move them through the membrane to the other side.
i. Uses a ligand or substrate to bind to active site to open gates for molecules to pass through. Ie) insulin

Differences between Animal and Plant Cells

a. Special Plant Cell Organelles - cell wall, large central vacuole, chloroplasts, plastids
b. Special Animal Cell Organelles - vesicles, lysosomes, small vacuoles, centrioles, and cilia, contains no cell wall.

Selective Permeability

quality of a membrane that allows certain molecules or ion to move through it more readily than others.

Types of Attachment Proteins

a. Desmosomes
b. Tight Junctions
c. Gap Junctions
d. Plasmodesmata


: attach cell together
i. Strongest of cell attachments
ii. Contains tensile strength
iii. Composed of protein filaments that anchor to cytoskeleton
iv. Ie)bladder, skin, intestine

Tight Junctions

make cell attachments
i. Found where tubes and sacs hold contents without leaking
ii. Series of seals
iii. Blocks water or water soluble molecules from passing
iv. Composed of globular proteins


direct communication between plant cells
i. Cells have holes that allow cytoplasmic fluid communication between cells.

Gap Junctions

direct communication between animal cells
i. Cell to cell protein channels allowing passage of hormones, ions, and nutrients
ii. Composed of proteins


is the process where mRNA decoded to attach amino acids to form polypeptide chains.


: is the process where DNA gives its info. and is transcribed into RNA code.


: is mixture of a solute and a solvent usually with a transparent appearance.


fluid capable of dissolving a solute.


substance that is dissolved into a solvent.


movement of molecules from a high concentration to a low concentration or along its concentration gradient.
c. Does not require energy.
d. Molecules naturally collide in solution therefore molecules will diffuse to get away from each other.
e. Purpose is to equalize the difference in concentration from one area to another.
f. Mainly used for energy harvesting.
g. 2 Types of Transport
- Passive Transport
- Active Transport


substance that defines the amount of solute in a given amount of solvent.


a physical difference in temp, pressure, charge, or concentration of a particular substance in a fluid between two adjoining regions of space.

Passive Transport

diffusion of substances across the membrane down concentration gradient.
1. Simple Diffusion:
2. Facilitated Diffusion:
3. Osmosis:

Simple Diffusion

substances move down their concentration gradient across the membrane, ie) CO2, water, O2, lipid soluble molecules like alcohol, vitamins A, D, E

Facilitated Diffusion

water soluble molecules like ions, amino acids, and sugars diffuse down their concentration gradients with the aid of channel (aquaporins) or carrier proteins


diffusion of water across a selectively permeable membrane.


is availability of free water molecules in solution to pass to from high concentration to low concentration

Isotonic Solution

solutions that have equal concentrations of water and dissolved substances

Hypertonic Solution

: higher concentration of solute to solvent, draws water in

Hypotonic Solution

lower concentration of solute to solvent, draws water away.

Turgor Pressure

water pressure within the large central vacuole, in hypertonic solution, water draws out and in hypotonic solution, water is drawn in pushing chloroplasts toward cell surface.

Active Transport

movement of molecules across the membrane using energy, usually going against its concentration gradient.
1. Active transport proteins usually contain a ligand binding site and an ATP binding site.
2. Usually referred to as pumps
3. Endocytosis:
4. Exocytosis:


engulfed particles are transported within the cell inside vesicles. ATP binds to site breaks off releasing ADP and P and the energy left is used to fuel action.


moves liquids into the cell

Receptor mediated Endocytosis

moves specific molecules into the cell, use special proteins that have coated pits that signal for specific molecule binding


moves large particles into the cell.


moves material out of the cell, uses energy to dispose waste or secrete substances into ECF for use.
a. Vesicles carrying material attach to lipid membrane and create an opening for substances to disperse.

Types of Endocytosis

a. Pinocytosis:
b. Receptor mediated endocytosis:
c. Phagocytosis:

Sodium-Potassium Pumps

a. Pumps are used to create an electrical signal in the body for rapid fire. As Sodium and Potassium diffuse across concentration gradient to create an electrical impulse for nerve cells to fire rapidly, active transport is used to return membrane to RMP.

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