AP Bio Final Chapter 7 Practice Test (1 of these is wrong)
A freshwater plant is put in saltwater. Which of the following is the least correct answer?
It is in a hypotonic solution
A sugar molecule that is needed by a cell is let in with the help of ATP. This is an example of
active transport
In order for a protein to be an integral membrane protein it would have to be which of the following?
amphipathic
The movement of potassium into an animal cell requires
an energy source such as ATP or a proton gradient
The sodium-potassium pump is called an electrogenic pump because it
contributes to the membrane potential
In most cells, there are electrochemical gradients of many ions across the plasma membrane even though there are usually only one or two electrogenic pumps present in the membrane. The gradients of the other ions are most likely accounted for by
cotransport protein
Ions diffuse across a membrane down their
electrochemical gradients
According to the fluid mosaic model of the membrane structure, proteins of the membrane are mostly
embedded in a lipid bilayer
The presence of cholesterol in the plasma membrane of some animals
enables the membrane to stay fluid more easily when cell temperature drops
When the concentration of water outside the cell membrane is greater than the concentration of water inside of them, the solution will become
hypotonic
Which of the following is a characteristic feature of a carrier protein in a plasma membrane?
it exhibits a specificity for a particular type of molecule
Which of the following statements is correct about diffusion?
it is a passive process in which molecules move from a region of higher concentration to a region of lower concentration
The concentration of salt outside of a plasma membrane is greater than the concentration on the other. All of the following are correct except
it must be an animal cell
What is the voltage across a membrane called?
membrane potential
White blood cells engulf bacteria through what process?
phagocytosis
Which of the following types of molecules are the major structural components of the membrane?
phospholipids and proteins
The difference between pinocytosis and receptor-mediated endocytosis is that
pinocytosis brings only water into the cell, but receptor-mediated endocytosis brings in other molecules as well
Which of the following is not a type of passive transport?
proton pumps
What kinds of molecules pass through a cell membrane most easily?
small and hydrophobic
Th movement of molecules during diffusion can be described by all of the following except
solute molecules always move down the concentration gradient
Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells?
the animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution
When a plant cell, such as one from a peony stem, is submerged in a very hypotonic solution, what is likely to occur?
the cell will become turgid
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
All gates channels must be
transmembrane proteins
A plant cell that becomes swollen due to the diffusion of water into them will become
turgid