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All of the following molecules are part of the cell membrane except
Phosphate groups
Proteins
Lipids
Nucleic acids
The presence of cholesterol in the plasma membranes of some animals
makes the membrane less flexible for sustaining pressure
makes the animal more susceptible to circulatory disorders
lets the membrane stay fluid when cell temperature drops
enables the membrane to more easily break down fats
According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?
they can move laterally along the plane of the membrane
they occur in an uninterrupted bilayer
they have hydrophilic tails in the interior of the membrane
they frequently flip-flop from one side to another
What kinds of molecules pass through the cell membrane most easily?
small and polar
large and polar
larger and nonpolar
small and nonpolar
Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?
CO2 (carbon dioxide)
K+ (potassium ion)
starch
amino acids
The selective permeability of biological membranes is dependent on which of the following?
the type of transport proteins that are present
the number of mitochondria in the cell
the types of carbohydrates on the surface of the membrane
Which of the following statements is correct about diffusion?
it requires an expenditure of energy by the cell
an active process that follows low to high concentration
a passive process that follows high to low concentration
it is very rapid over long distances
A patient has had a serious accident and lost a lot of blood. Equal to the blood volume lost, the patient is given distilled water. What will be the most probable result of this diffusion?
RBCs will shrivel - blood fluid is hypertonic
RBCs will shrivel - blood fluid is hypotonic
RBCs will burst - blood fluid is hypertonic
RBCs will swell - blood fluid is hypotonic
Celery stalks are immersed in fresh water for several hours and become stiff and hard. Similar stalks left in salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are
hypotonic to fresh water but hypertonic to salt solution
isotonic with fresh water but hypotonic to salt solution
hypertonic to both fresh water and salt water
hypotonic to both fresh water and salt water
A cell whose cytoplasm has a concentration of 0.02M glucose is places in a test tube of water containing 0.02M glucose. Which of the following describes the tonicity of the external solution relative to the cytoplasm of the cell?
Isotonic
The movement of a substance across a biological membrane against its concentration gradient with the help of energy input is
Active transport
The solutions in the arms of the U-tube are separated at the bottom of the tube by a selectively permeable membrane. The membrane is permeable to water but not to the dots. What is the change in the picture due to?
Facilitated diffusion
Endocytosis
Osmosis
Diffusion
All of the following membrane activities require energy from ATP hydrolysis except
Active transport
Phagocytosis
Na+ ions moving out of the cell
Facilitated diffusion
All of the following processes take materials into the cell except
Facilitated diffusion
Pinocytosis
Exocytosis
Endocytosis
You are a biochemist making a new drug. For the drug to work, it must enter the cytoplasm of specific cells. Which of the following is NOT a factor that determines whether the molecule enters the cell?
Polarity of the drug molecule
Size of the drug molecule
Lipid composition of the target cells' plasma membrane
Charge on the drug molecule
What are the membrane structures that function in active transport?
Carbohydrates
Cholesterol
Proteins
Phospholipids
