Prokaryotes
Cells that do not contain nuclei
Eukaryotes
organisms made up of one or more cells that have a nucleus and membrane-bound organelles
Eukaryotes vs Prokaryotes
eukaryotes have a nucleus and prokaryotes do not, as prokaryotes don't have membrane bound organisms
Nucleus
A part of the cell containing DNA and RNA and responsible for growth and reproduction
Cytoplasm
A jellylike fluid inside the cell in which the organelles are suspended
Endomembrane System
A network of membranes inside and around a eukaryotic cell, related either through direct physical contact or by the transfer of membranous vesicles.
Vesicles
small membrane sacs that specialize in moving products into, out of, and within a cell
Rough Endoplasmic Reticulum
An endomembrane system covered with ribosomes where many proteins for transport are assembled.
Smooth Endoplasmic Reticulum
an endomembrane system without ribosomes, creates lipids or fat
Golgi apparatus
A system of membranes that modifies and packages proteins for export by the cell
Lysosomes
cell organelle filled with enzymes needed to break down certain materials in the cell
Mitochondria
An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
Chloroplasts
organelles that capture the energy from sunlight and convert it into chemical energy in a process called photosynthesis
Cell Wall
A rigid structure that surrounds the cell membrane and provides support to the cell, found in plants and other bacterias
Cytoskeleton
A network of fibers that holds the cell together, helps the cell to keep its shape, and aids in movement
Vacuole
Cell organelle that stores materials such as water, salts, proteins, and carbohydrates
Turgor pressure
the pressure that is exerted on the inside of cell walls and that is caused by the movement of water into the cell
Compartmentalization
Membrane-bound organelles allow different parts of the cell to perform different functions at the same time
Endosymbiosis
A theorized process in which early eukaryotic cells were formed from simpler prokaryotes.
Origin of eukaryotic cells
Cell membrane
A cell structure that controls which substances can enter or leave the cell. semipermeable
Phospholipids
A molecule that is a constituent of the inner bilayer of biological membranes, having a polar, hydrophilic head and a nonpolar, hydrophobic tail. Only allowing small non polar molecules throug
Phospholipids bilayer
a two-layered arrangement of phosphate and lipid molecules that form a cell membrane, the hydrophobic lipid ends facing inward and the hydrophilic phosphate ends facing outward.
Saturated Fatty Acid Chain
contains a long linear or branched chain of carbon atoms
Unsaturated Fatty Acid Chain
one or more double carbon bonds causing the structure to bend
Cholesterol
used for structure in the cell membrane
Membrane fluidity
cell membrane is able to adapt its shape and move in different environments
Transport Proteins
membrane proteins that help move substances across a cell membrane, moves molecules that typically can't pass through the cell membrane due to it being too big or a polar molecule
Receptor Proteins
Proteins that transmit information in and out of cells. They allow communication between cells.
Glycolipid
is used for cell recognition and formation of tissues
Glycoprotein
allows immune responses and helps identify other cells
Fluid mosaic model
Structural model of the plasma membrane as a mosaic and giving it its fluid character due to the fluid components
concentration gradient
moving solutes and molecules from high to low
Passive Transport
uses no energy moving molecules with the concentration gradient through the membrane
facilitated diffusion
Movement of specific molecules across cell membranes through protein channels
Channel Protein
a protein that allows the transport of specific substances across a cell membrane
Carrier Protein
binds specific solutes and transfers them through the cell membrane
Aquaporins
A transport protein in the plasma membrane of a plant or animal cell that specifically facilitates the diffusion of water across the membrane
Active Transport
Primary Active Transport
uses ATP directly to transport against the solutes against the gradient
Secondary Active Transport
Form of active transport which does not use ATP as an energy source; rather, transport is coupled to ion diffusion down a concentration gradient established by primary active transport.
Endocytosis
takes substances from outside and into the cell
Exocytosis
moves molecules outside the cell
Standard deviation
how far the values are from the mean
Ratios
a comparison of one quantity to another
surface area to volume affecting diffusion
as size and disance increase, diffusion takes longer
why bacteria so small
large surface area to volume ratio
Diffusion in multicellular organisms
less surface area to volume, because of the big volume, diffusion takes longer so they use other mechanisms
Solutes
dissolved substances
Molarity
concentration of a solute (mol/L) moles per liter
Osmosis
Movement of water across a semipermeable membrane
water potential
chemical and physical forces affecting the movement of water (Ψ = ΨS + ΨP)
Osmotic pressure
tendency of water to move from one solution into another through osmosis
Tonicity
osmotic pressure and direction of water movement
Hypertonic
higher solute concentration, water moves out and cell shrink
Hypotonic
lower solute concentration, water moves into the cell and it bursts
Isotonic
concentration is the same
Contractile vacuoles
take excess water from inside the cell and expel it out through contraction
Osmoregulation
regulation of osmotic pressure inside cells and organisms
cellular respiration
Substrate-level phosphorylation
glycolysis
pyruvate oxidation
Krebs Cycle
electron carriers used in cellular respiration
glycogen
respiratory electron transport chain
Oxidative phosphorylation
proton gradient
Lactic acid fermentation
Singal Transduction
chemical or physical signal occurs between cells
Amplification
increases the amount of reaction products from a small amount of signal molecules
G protein coupled receptor protein
located on the surface of the cell, regulates bodily functions, termination through kinases
Second messenger
small molecules that relays cell signals from a cells surface to effector proteins in order to produce a reaction in the body
receptor protiens
transmit information in and out of cells. They allow communication between cells.
ligand
molecule that transmits signals between or within by binding to receptors, ligand specificity help respond to environmental change
polar and non polar ligands
polar ligands binds to the cell-surface receptors, non polar ligands bind to the intercellular receptors
kinase
an enzyme that phosphorylates different molecules
agonists
Antagonist
bind to the receptor but doesn't promote conformation
signaling cascade
chemical reactions which are triggered by a stimulus and produce a response from the body
ligand-gated ion channel
proteins change its shape in responds to bonding of ligands, allowing specific ions to pass through the cell membrane
mutations in genes
change in genes, changes the genes expression and the proteins that are made from RNA
cAMP
cyclic adenosine monophosphate, second messenger that carries signals for cell communication
negative feedback loop
goes against the stimulus until it stops ex:sweating
positive feedback loop
amplifies the stimulus until it stops ex: childbirth