Chemistry Review Flashcards
majority of lipids in a membrane are ________
phospholipids
molecules that are both hydrophilic and hyrdophobic are_____
amphipathic
longer hydrophobic tails _________ the fluidity of the membrane
decreases
shorter hydrophobic tails ________ the fluidity of the bilayer
increases
most phospholipids have ______ hydrophobic tails
two
carbon atoms have _____ valence electrons
4
covalent bonds are the sharing of electrons in the _______ shell
valence
a carbon atom with single covalent bonds can bond to _______ hydrogens
4
a carbon with a double covalent bond can bond to ____ other molecules
3
carbon tails with double covalent bonds are called ___________
unsaturated
saturated hydrophobic tails have _________ bonds
covalent
a membrane with unsaturated hydrophobic tails is ________ fluid
more
a membrane with saturated hydrophobic tails is _______ fluid
less
margarine is made of hydrophobic tails with ________ covalent bonds
single
olive oil is made of hydrophobic tails with ______ covalent bonds
double
double covalent bond =
unsaturated
why do double covalent bonds lead to fats that tend to be more fluidic?
the double covalent bond makes kinks in the tail, which prevents a matrix from forming
permeability factors
hydrophilicity and size
T/F hydrophobic molecules pass easily through a cell membrane
T
Can hydrophilic molecules pass through the cell membrane?
Yes, if they’re partially charged
cell membranes are generally __________ to ions
impermeable
cell membranes are generally impermeable to _____
ions
glucose is very _______ to pass through the cell membrane
unlikely
T/F hydrophobic molecules easily pass through the cell membrane
F
