BIOL 1P91 – Final EXAM .OVER 280 QUESTIONS WITH VERIFIED CORRECT ANSWERS

BIOL 1P91 – Final EXAM .OVER 280
QUESTIONS WITH VERIFIED CORRECT
ANSWERS
Holds the cell together and controls what goes in and out -
ANSWER cell membrane
separates cell contents from the surrounding environment -
ANSWER plasma membrane
uptake and export of ions and molecules, cell
compartmentalization, protein storing, anchoring cytoskeleton,
production of ATP and NADPH, cell signalling, cell and nuclear
division, and adhesion of cells to each other and to the
extracellular matrix - ANSWER what are important functions of
cell membranes?
phospholipid bilayer - ANSWER what are biological membranes
made of?
protein, yet most have carbohydrates attached to lipids and
proteins - ANSWER what do biological membranes ALWAYS
contain?
cholesterol - ANSWER what do animal cell membranes contain?
phytosterols - ANSWER what do plant cell membranes contain?
half of a phospholipid bilayer - ANSWER what is a leaflet?
a plasma membrane that is a semi-fluid phospholipid bilayer with
a mosaic of proteins - ANSWER what is the fluid mosaic model?
Process of covalently attaching a carbohydrate to a protein or
lipid - ANSWER What is glycosylation?
cell protection - ANSWER What is the glycocalyx?
integral and non-integrated proteins - ANSWER what are the two
types of membrane proteins?
transmembrane proteins and lipid anchor proteins - ANSWER
what are the two types of integral membrane proteins
the phospholipid bilayer - ANSWER transmembrane proteins
span through _________
lipid - ANSWER lipid anchor proteins are the covalent
attachments of a _______ to an amino acid side chain
integral membrane proteins - ANSWER peripheral membrane
proteins are non-covalently bound to what?
transport, cell signalling, secretion, and cell recognition -
ANSWER what cellular processes do membrane proteins
participate in?
membranes are semi-fluid - ANSWER describe membrane
fluidity.
yes they are because fatty acyl tails stay within the hydrophobic
interior - ANSWER are membrane movements energetically
favorable? why?
no, only occur if energy is used - ANSWER do lipid transfers
happen spontaneously?
they cause lipid transfers - ANSWER what do flippases do?
group of lipids that strongly associate with each other and move
a unit in the membrane - ANSWER What are lipid rafts?
cytoskeleton and the extracellular matrix - ANSWER proteins
attached to which two organelles do not move.
they are selectively permeable - ANSWER are membranes
permeable?
essential molecules enter, metabolic intermediates remain, and
waste products exit - ANSWER what do membrane structures
ensure about what enters and exits the cell?
too fluid - the cell could leak, not fluid enough - cell may not move
or function properly - ANSWER what happens if the bilayer is too
fluid? or not fluid