Structure and Functions of Membranes and Membrance Protiens. Exam1 Flashcards
What does the lipid bilayer include?
Cholesterol and Cardiac Glycosides
What molecules make up most of the Lipid Bilayer?
Phospholipid Molecules
What is amphipathic?
both water and lipid soluble
What is the model of individual proteins floating about the lipid bilayer called?
Singer-Nicholson fluid mosaic model
What is the first major function of cell membrane protiens?
Transport
What happens in the first function of a cell membrane protein?
A. Protein pores and gated channels
B. Carrier proteins
C. Na+/K+ ATPase enzyme proteins
What is the second major function of cell membrane proteins?
Recognition
What happens in the second function of cell membrane proteins?
A. Surface glycoproteins as markers
B. Antigen-recognition receptors on immune cells
What is the third major function of a cell membrane protein?
Signal Reception
What happens during the third function of cell membrane proteins?
Surface protein receptors for hormones, never transmitter and other factors.
What is the fourth function of cell membrane proteins?
Attachment
What happens during the fourth function of cell membrane proteins?
A. Protein Junctions attach to cell
B. Antigen proteins stick cell to surface crawling, anchoring, association of cells into tissue
What is the fifth function of cell membrane proteins?
Generation of Electrical Potential
What happens during the fifth function of cell membrane proteins?
Separation of charges/ions causes voltage to develop. Important in explaining actions of nerve, muscle and hair cell membranes.
What is the sixth function of cell membrane proteins?
Membrane attached enzymes
What happens during the sixth function of cell membrane proteins?
Ex. Nerves attract to muscle so muscle contracts.
What happens during the seventh function of a cell membrane protein?
Cell shape/Structure
What happens during the seventh stage of cell membrane proteins?
proteins develop into shapes of rods, tubes and fibers can form.
What is the cytoskeleton?
framework inside of a cell
How many amino acids is a protein made up of?
100 amino acids
100 amino acids are connected by what?
peptide bonds
what is a chain of up to 99amino acids called?
polypeptides
How many different amino acids are there in the human body?
21
What is a multimeric protein?
when several proteins bind together to form a single large assembly
