Exam 1 Flashcards
What are Prokaryotic cells
Small, singled with simple structure
What are Eukaryotic cells
Larger, and more complex cells (all multicellular and some unicellular)
Nucleus function
Contains DNA, and controls replication of DNA
Mitochondria function
The cells energy transformers (creating ATP)
Smooth endoplasmic reticulum
without ribosomes, synthesizes lipids
Rough endoplasmic reticulum
transports proteins to various sites within a cell
Golgi apparatus (Golgi body)
Package and export of substances out of the cell
Lysosome
they break down non-functioning cell organelles and substances
Cytoskeleton
Supports and strengthens the cell
chloroplasts
Convert energy from the sun using photosynthesis
Cell wall
Provides protection shape and support of the cell
Ribosomes
manufacture proteins (makes)
Vacuole
Storage of nutrients, waste disposal
Plasma membrane (cell membrane)
the outmost barrier of the cell, separating it from other cells
What organelles are different from animal and plant
plants have cell wall chloroplasts and large centralised vacuole, lysosomes are in animal cells
What are the main elements of the plasma membrane
Phospholipids (containing hydrophilic heads, and hydrophobic tails)Channel proteins, and carrier proteins
What is the fluid mosaic model
The model that represents the plasma membrane (phospholipid bilayer and proteins)
What are channel proteins
proteins that channel molecules in by creating a hydrophilic passage across the membrane
What are carrier proteins
Proteins that carry molecules by changing shape and carrying across the membrane, these carry hydrophilic uncharged substances
How do gases cross the plasma membrane
through simple diffusion
How do hydrophobic molecules cross the plasma membrane
simple diffusion
How do small polar molecules cross the plasma membrane
simple diffusion
How do large polar molecules cross the plasma membrane
Facilitated diffusion or active transport
what is a solute
substance that is dissolved
what it a solvent
liquid which a solute dissolves
what is simple diffusion
the movement of solutes across the phospholipid bilayer from a region of higher concentration to a region of lower concentration
what is facilitated diffusion
diffusion using a protein such as channel or carrier protein
What is osmosis
Diffusion of water molecules from an area of high free water to an area of low free water
what is a isotonic solution
a solution with equal solute and solvent concentration
what is a hypotonic solution
having a lower solute concentration than the cell contents (the cell will expand)
What is a hypertonic solution
Having a higher solute concentration than the cells content (the cell shrinks)
What is active transport
the process of moving substances from an area of low concentration to an area of high concentration (uses energy)
what is bulk transport made up of
Endocytosis and exocytosis (both require energy)
What is pinocytosis
bulk movement of material that is in a solution (liquid) into cells
What is phagocytosis
bulk movement of solid material into cells
how does endocytosis work
plasma membrane folds around a substance to transport it across the plasma membrane into the cell
how does exocytosis work
unwanted substances fuse with the plasma membrane and it wraps around it and then expels it out of the
Which transport mechanism requires energy
active transport and bulk transport