IB Biology: Cell Membranes and Transport
Mechanisms Review UPDATED ACTUAL
Questions and CORRECT Answers
Phospholipid bilayer Biological membranes are primarily composed of
a phospholipid bilayer that forms the basic
structural framework.
Phospholipids The lipid bilayer is made up of phospholipids,
which have both hydrophilic (heads) and
hydrophobic (tails) regions.
Large, hydrophilic molecules The hydrophobic core of the membrane acts as a
barrier to large and hydrophilic molecules,
including ions.
Integral proteins Integral proteins are embedded within the
membrane.
Peripheral proteins Peripheral proteins are attached to the surface of
the membrane.
Osmosis The movement of water across a semipermeable
membrane is called osmosis.
Mechanisms Review UPDATED ACTUAL
Questions and CORRECT Answers
Phospholipid bilayer Biological membranes are primarily composed of
a phospholipid bilayer that forms the basic
structural framework.
Phospholipids The lipid bilayer is made up of phospholipids,
which have both hydrophilic (heads) and
hydrophobic (tails) regions.
Large, hydrophilic molecules The hydrophobic core of the membrane acts as a
barrier to large and hydrophilic molecules,
including ions.
Integral proteins Integral proteins are embedded within the
membrane.
Peripheral proteins Peripheral proteins are attached to the surface of
the membrane.
Osmosis The movement of water across a semipermeable
membrane is called osmosis.
