The fluid mosaic model of membrane structure suggests that membranes are composed of a single fluid layer of phospholipids and proteins
are composed of a fluid bilayer of fatty acids with proteins associated on the outer and inner surfaces
are composed of protein molecules embedded in a fluid bilayer of phospholipids
are composed of a fluid phospholipid bilayer sandwiched between two layers of hydrophilic proteins

what are the choices?

a axis of a graph is a color or shade so we can all go outside and have a party so we can eat   some grilled cheese sammiches and broccoli and have some ugly fun times

i don't know why i put this, i know its not the i was just bored : p

delete this answer while you can

the answer is d.) homologous; have mammary glands

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products