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