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What are the features of cell membrane?
Phospholipid bilayer, proteins, cholesterol, selectively permeable.
What is diffusion?
Movement of molecules from high to low concentration.
What is Osmosis?
Diffusion of water across a membrane.
What is active transport?
Moves substances from low to high concentration using energy(ATP).
What molecule can move without a protein?
Small, nonpolar molecules (e.g O2 CO2)
Why do ions need protein to transport?
Ions are charged and cannot pass through the lipid bilayer without help.
What is facilitated diffusion?
Uses a protein to move substances down the concentration gradient (high to low).
What are amino acids?
Proteins building blocks
What are Lipids made out of?
Glycerol and fatty acids
DNA is a:
Nucleic acid
What is the role of an enzyme in metabolism?
Speeds up (catalyzes) biochemical reactions by lowering activation energy