Trimester 1 flashcards (copy)

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Prokaryotes

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86 Terms

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Prokaryotes

Cells that do not contain nuclei

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Eukaryotes

organisms made up of one or more cells that have a nucleus and membrane-bound organelles

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Eukaryotes vs Prokaryotes

eukaryotes have a nucleus and prokaryotes do not, as prokaryotes don't have membrane bound organisms

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Nucleus

A part of the cell containing DNA and RNA and responsible for growth and reproduction

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Cytoplasm

A jellylike fluid inside the cell in which the organelles are suspended

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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.

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Vesicles

small membrane sacs that specialize in moving products into, out of, and within a cell

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Rough Endoplasmic Reticulum

An endomembrane system covered with ribosomes where many proteins for transport are assembled.

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Smooth Endoplasmic Reticulum

an endomembrane system without ribosomes, creates lipids or fat

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Golgi apparatus

A system of membranes that modifies and packages proteins for export by the cell

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11

Lysosomes

cell organelle filled with enzymes needed to break down certain materials in the cell

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12

Mitochondria

An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.

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Chloroplasts

organelles that capture the energy from sunlight and convert it into chemical energy in a process called photosynthesis

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Cell Wall

A rigid structure that surrounds the cell membrane and provides support to the cell, found in plants and other bacterias

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Cytoskeleton

A network of fibers that holds the cell together, helps the cell to keep its shape, and aids in movement

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Vacuole

Cell organelle that stores materials such as water, salts, proteins, and carbohydrates

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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

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Compartmentalization

Membrane-bound organelles allow different parts of the cell to perform different functions at the same time

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Endosymbiosis

A theorized process in which early eukaryotic cells were formed from simpler prokaryotes.

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Origin of eukaryotic cells

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Cell membrane

A cell structure that controls which substances can enter or leave the cell. semipermeable

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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

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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.

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Saturated Fatty Acid Chain

contains a long linear or branched chain of carbon atoms

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Unsaturated Fatty Acid Chain

one or more double carbon bonds causing the structure to bend

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Cholesterol

used for structure in the cell membrane

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Membrane fluidity

cell membrane is able to adapt its shape and move in different environments

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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

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Receptor Proteins

Proteins that transmit information in and out of cells. They allow communication between cells.

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Glycolipid

is used for cell recognition and formation of tissues

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Glycoprotein

allows immune responses and helps identify other cells

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Fluid mosaic model

Structural model of the plasma membrane as a mosaic and giving it its fluid character due to the fluid components

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concentration gradient

moving solutes and molecules from high to low

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Passive Transport

uses no energy moving molecules with the concentration gradient through the membrane

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facilitated diffusion

Movement of specific molecules across cell membranes through protein channels

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Channel Protein

a protein that allows the transport of specific substances across a cell membrane

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Carrier Protein

binds specific solutes and transfers them through the cell membrane

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Aquaporins

A transport protein in the plasma membrane of a plant or animal cell that specifically facilitates the diffusion of water across the membrane

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Active Transport

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Primary Active Transport

uses ATP directly to transport against the solutes against the gradient

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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.

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Endocytosis

takes substances from outside and into the cell

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Exocytosis

moves molecules outside the cell

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Standard deviation

how far the values are from the mean

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Ratios

a comparison of one quantity to another

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46

surface area to volume affecting diffusion

as size and disance increase, diffusion takes longer

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why bacteria so small

large surface area to volume ratio

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Diffusion in multicellular organisms

less surface area to volume, because of the big volume, diffusion takes longer so they use other mechanisms

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Solutes

dissolved substances

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50

Molarity

concentration of a solute (mol/L) moles per liter

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Osmosis

Movement of water across a semipermeable membrane

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water potential

chemical and physical forces affecting the movement of water (Ψ = ΨS + ΨP)

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Osmotic pressure

tendency of water to move from one solution into another through osmosis

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Tonicity

osmotic pressure and direction of water movement

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Hypertonic

higher solute concentration, water moves out and cell shrink

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Hypotonic

lower solute concentration, water moves into the cell and it bursts

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Isotonic

concentration is the same

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Contractile vacuoles

take excess water from inside the cell and expel it out through contraction

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Osmoregulation

regulation of osmotic pressure inside cells and organisms

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cellular respiration

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Substrate-level phosphorylation

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glycolysis

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pyruvate oxidation

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Krebs Cycle

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electron carriers used in cellular respiration

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glycogen

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respiratory electron transport chain

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Oxidative phosphorylation

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proton gradient

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Lactic acid fermentation

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Singal Transduction

chemical or physical signal occurs between cells

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Amplification

increases the amount of reaction products from a small amount of signal molecules

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G protein coupled receptor protein

located on the surface of the cell, regulates bodily functions, termination through kinases

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Second messenger

small molecules that relays cell signals from a cells surface to effector proteins in order to produce a reaction in the body

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receptor protiens

transmit information in and out of cells. They allow communication between cells.

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ligand

molecule that transmits signals between or within by binding to receptors, ligand specificity help respond to environmental change

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polar and non polar ligands

polar ligands binds to the cell-surface receptors, non polar ligands bind to the intercellular receptors

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kinase

an enzyme that phosphorylates different molecules

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agonists

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Antagonist

bind to the receptor but doesn't promote conformation

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signaling cascade

chemical reactions which are triggered by a stimulus and produce a response from the body

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ligand-gated ion channel

proteins change its shape in responds to bonding of ligands, allowing specific ions to pass through the cell membrane

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mutations in genes

change in genes, changes the genes expression and the proteins that are made from RNA

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84

cAMP

cyclic adenosine monophosphate, second messenger that carries signals for cell communication

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negative feedback loop

goes against the stimulus until it stops ex:sweating

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positive feedback loop

amplifies the stimulus until it stops ex: childbirth

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