BIOL 212 EXAM 1 CORE BIOLOGY CONCEPTS
AND CELLULAR PROCESSES REVIEW 2026
◉ Biological membranes are composed primarily of.
Answer: proteins, carbohydrates, and lipids.
◉ Carbohydrates play a role in the biological membrane as
recognition sites for other cells and molecules. They are able to bind
with a protein in the membrane to form.
Answer: glycoproteins
◉ Receptor-mediated endocytosis is the mechanism for transport of.
Answer: cholesterol
◉ Osmosis is a specific form of.
Answer: diffusion
◉ Which of the following statements about diffusion is false?.
Answer: Simple diffusion depends upon specific carrier proteins.
◉ If a cell has an increased need for a particular molecule that
already is present in a higher concentration within the cell than in
,the extracellular fluid, the cell might use active transport, which
usually moves molecules.
Answer: in a direction opposite to the one in which diffusion moves
them
◉ The structure of a biological membrane is best described by the
_______ model.
Answer: fluid mosaic
◉ In the intestine, Na+ and an amino acid bind to the same transport
protein that moves the two substances in the same direction. This
transporter is a(n).
Answer: symporter
◉ Which of the following statements about channel proteins is true?.
Answer: All of the above (They have a central pore of polar amino
acids and water, they are anchored in the hydrophobic bilayer of the
plasma membrane, They are surrounded by nonpolar amino acids,
They are often gated.)
◉ The process of osmosis allows water molecules to pass through
specialized channels in membranes. Which of the following
statements about osmosis is true?.
Answer: Water will move across a membrane to a region with more
solute.
,◉ If there is a concentration gradient of glucose across a membrane,.
Answer: The glucose molecules are more numerous on one side of
the membrane than on the other.
◉ If equal volumes of differently colored solutions are poured into
opposite sides of a shallow pool of water, what will be the result at
equilibrium?.
Answer: The solutions will be uniformly distributed throughout the
pool.
◉ If a hospital patient is mistakenly given an IV of pure water
instead of a saline solution that is isotonic to blood, the patient's red
blood cells will.
Answer: absorb water from the plasma and eventually burst.
◉ The sodium‒potassium pump found in animal cells is a(n).
Answer: antiporter
◉ For each molecule of ATP consumed during active transport of
sodium and potassium, there is an import of _______ ion(s) and an
export of _______ ion(s).
Answer: two K+; three Na+
, ◉ In a biological membrane, the phospholipids are arranged in a
_______, with the _______..
Answer: bilayer; fatty acids pointing toward each other
◉ If a cell membrane lacking integral proteins is prepared by freeze
fracture and examined under the electron microscope, the exposed
interior of the membrane bilayer will.
Answer: look smooth.
◉ The hydrophilic regions of a membrane protein would most likely
be found exposed on.
Answer: the surface of the membrane.
◉ The LDL receptor is an integral membrane protein that extends
both outside and into the interior of the cell. The amino acid side
chains (R groups) in the region of the protein that crosses the
membrane are most likely.
Answer: hydrophobic
◉ Which type of membrane protein would likely be removed most
easily from a cell membrane in a laboratory experiment? Peripheral
proteins.
Answer: Peripheral proteins
AND CELLULAR PROCESSES REVIEW 2026
◉ Biological membranes are composed primarily of.
Answer: proteins, carbohydrates, and lipids.
◉ Carbohydrates play a role in the biological membrane as
recognition sites for other cells and molecules. They are able to bind
with a protein in the membrane to form.
Answer: glycoproteins
◉ Receptor-mediated endocytosis is the mechanism for transport of.
Answer: cholesterol
◉ Osmosis is a specific form of.
Answer: diffusion
◉ Which of the following statements about diffusion is false?.
Answer: Simple diffusion depends upon specific carrier proteins.
◉ If a cell has an increased need for a particular molecule that
already is present in a higher concentration within the cell than in
,the extracellular fluid, the cell might use active transport, which
usually moves molecules.
Answer: in a direction opposite to the one in which diffusion moves
them
◉ The structure of a biological membrane is best described by the
_______ model.
Answer: fluid mosaic
◉ In the intestine, Na+ and an amino acid bind to the same transport
protein that moves the two substances in the same direction. This
transporter is a(n).
Answer: symporter
◉ Which of the following statements about channel proteins is true?.
Answer: All of the above (They have a central pore of polar amino
acids and water, they are anchored in the hydrophobic bilayer of the
plasma membrane, They are surrounded by nonpolar amino acids,
They are often gated.)
◉ The process of osmosis allows water molecules to pass through
specialized channels in membranes. Which of the following
statements about osmosis is true?.
Answer: Water will move across a membrane to a region with more
solute.
,◉ If there is a concentration gradient of glucose across a membrane,.
Answer: The glucose molecules are more numerous on one side of
the membrane than on the other.
◉ If equal volumes of differently colored solutions are poured into
opposite sides of a shallow pool of water, what will be the result at
equilibrium?.
Answer: The solutions will be uniformly distributed throughout the
pool.
◉ If a hospital patient is mistakenly given an IV of pure water
instead of a saline solution that is isotonic to blood, the patient's red
blood cells will.
Answer: absorb water from the plasma and eventually burst.
◉ The sodium‒potassium pump found in animal cells is a(n).
Answer: antiporter
◉ For each molecule of ATP consumed during active transport of
sodium and potassium, there is an import of _______ ion(s) and an
export of _______ ion(s).
Answer: two K+; three Na+
, ◉ In a biological membrane, the phospholipids are arranged in a
_______, with the _______..
Answer: bilayer; fatty acids pointing toward each other
◉ If a cell membrane lacking integral proteins is prepared by freeze
fracture and examined under the electron microscope, the exposed
interior of the membrane bilayer will.
Answer: look smooth.
◉ The hydrophilic regions of a membrane protein would most likely
be found exposed on.
Answer: the surface of the membrane.
◉ The LDL receptor is an integral membrane protein that extends
both outside and into the interior of the cell. The amino acid side
chains (R groups) in the region of the protein that crosses the
membrane are most likely.
Answer: hydrophobic
◉ Which type of membrane protein would likely be removed most
easily from a cell membrane in a laboratory experiment? Peripheral
proteins.
Answer: Peripheral proteins
