Which of the following types of molecules are the major structural components of the cell membrane?
A. phospholipids and proteins
According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids
C. they can move laterally along the plane of the membrane
All of the following are functions of intergral membrane proteins- except
A. enzyme synthesis
All of the following statements about membrane structure and functions are true -except
C. both sides of a membrane are indentical in structure and function
Of the following functions, the glyoproteins and glycolipids of animals cell membranes are most important for:
C. the ability of cells to recognize like and different cells
the kinds of molecules that pass through a cell membrane most easily are
D. small and hydrophobic
Which of the following is a characteristic feature of a carrier protein in a plasma membrane?
A. it exhibits a specificity for a particular type of molecule
which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?
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:
C. hypertonic to fresh water but hypotonic to the salt solution
All of the following cellular activities require ATP energy - except -
B. movement of O2 into the cell
the movement of a substance across a biological membrane against its concentration gradient with the help of energy input is which of the following?
D. active transport
Water passes quickly through cell membranes because
B. it moves through aquaporins in the membrane
Which of the following characterizes the sodium-potassium pump?
D. A, B and C
An organism with a cell wall would have the most difficulty doing which process?
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?
D. 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.