AP BIO CHAPTER 7 QUIZ

Which of the following types of molecules are the major structural components of the cell membrane?
A. phospholipids and cellulose
B. phospholipids and proteins
C. nucleic acids and proteins
D. glycoproteins and cholesterol
E. proteins and cellulose

According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids
A. they occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane
B. they are free to depart from the membrane and dissolve in the surrounding solution
C. they can move laterally along the plane of the membrane
D. they have hydrophilic tails in the interior of the membrane
E. they frequently flip-flop from one side of the membrane to the other

All of the following are functions of intergral membrane proteins- except
A. active transport
B. cell adhesion
C. enzyme synthesis
D. cytoskeleton attachment
E. hormone reception

All of the following statements about membrane structure and functions are true -except
A. difffusion of gases is faster in air than across membranes
B. diffusion, osmosis, and facilitated diffusion do not require any energy input from the cell
C. both sides of a membrane are indentical in structure and function
D. voltage across the membrane depends on an unequal distribution of ions across the plasma membrane
E. special membrane proteins can cotransport two solutes by coupling diffusion with active transport

Of the following functions, the glyoproteins and glycolipids of animals cell membranes are most important for:
A. active transport of molecules against their mosaic membrane
B. maintaining the integrity of a fluid mosaic membrane
C. facilitiated diffusion of molecules down their concentration gradients
D. maintaining membrane fluidity at low temperatures
E. the ability of cells to recognize like and different cells

the kinds of molecules that pass through a cell membrane most easily are
A. ionic
B. small and hydrophobic
C. large polar molecules
D. monosaccgaraudes such as glucose
E. large and hydrophobic

Which of the following is a characteristic feature of a carrier protein in a plasma membrane?
A. it works against diffusion
B. it is a peripheral membrane protein
C. it exhibits a specificity for a particular type of molecule
D. it requires energy to function
E. it has few, if any, hydrophobic amino acids

which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?
A. starch
B. glucose
C. CO2
D. an amino acid
E. K+

Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are:
A. hypotonic to both fresh water and the salt solution
B. hypertonic to both fresh water and the salt solution
C. hypertonic to fresh water but hypotonic to the salt solution
D. hypotonic to fresh water by hypertonic to the salt soultion
E. isotonic with fresh water but hypotonic to the salt solution

All of the following cellular activities require ATP energy - except -
A. Na+ ions moving out of the cell
B. protein synthesis
C. cytoplasmic streaming
D. movement of O2 into the cell
E. exocytosis

the movement of a substance across a biological membrane against its concentration gradient with the help of energy input is which of the following?
A. osmosis
B. active transport
C. exocytosis
D. diffusion
E. facilitated diffusion

Water passes quickly through cell membranes because
A. it moves through hydrophobic channels
B. it is a small, polar, charged molecule
C. water movement is tied to ATP hydrolysis
D. it moves through aquaporins in the membrane
E. the bilayer is hydrophilic

Which of the following characterizes the sodium-potassium pump?
A. sodium ions are pumped out of a cell against their gradient
B. A and B
C. a carrier protein undergoes conformational change.
D. potassium ions are pumped into a cell against their gradient
E. A, B and C

An organism with a cell wall would have the most difficulty doing which process?
A. osmosis
B. active transport
C. diffusion
D. phagocytosis
E. exocytosis

A patient has had a serious accident and lost a lot of blood. In an attempt to replenish body fluids, a large amount of distilled water was transferred directly into one of the veins. What will be the most probable result of this transfusion?
A. it will have no serious effect because the kidneys would quickly eliminate the excess water
B. it will have no unfavorable effect as long as the water is free of viruses and bacteria
C. it will have serious, perhaps fatal, consequences because the red blood cells will be hypertonic relative to the body fluids and the cells will burst.
D. it will have serious, perhaps fatal, consequences because the red blood cells will be hyoptonic relative to the body fluids and the cells will shrivel
E. it will have serious, perhaps fatal, consequences because there will be too much fluid for the heart to pump