A&P Chapter 4 Quiz

Active transport requires... a) An open channel on the surface of the cell b) A carrier protein on the surface of the cell c) A receptor within the cell d) An enzyme within the cell

A carrier protein on the surface of the cell

Facilitated diffusion requires... a) Enzymes b) Carrier Proteins c) Lipid Carriers d) Carbohydrate Carriers e) Lipid or Carbohydrate Carriers

Carrier Proteins

True or False: Active transport is able to move substances without the expenditure of energy

False

True or False: The selective permeability of the plasma membrane allows all substances to pass through the membrane, ensuring that the inside of the cell is in constant interaction with its external environment.

False

True or False: Unlike simple diffusion, facilitated diffusion requires energy expenditure by the cell

False

The type of passive transport that involves the movement of water across a semipermeable membrane from a region of high water concentration to a region of low water concentration is called what? a) Osmosis b) Facilitated diffusion c) Exocytosis d) Endocytosis

Osmosis

Certain white blood cells engulf microorganisms and bring them in to digest them. This process is best described as... a) Pinocytosis b) Osmosis c) Receptor-mediated exocytosis d) Phagocytosis e) Diffusion

Phagocytosis

Exocytosis is a process by which cells... a) Release substances from the cell through pores in the cell membrane b) Release substances from the cell via vesicles c) Release substances from the cell via carrier proteins d) Bring in substances from the outside via vesicles e) Bring in substances from the outside via pores in the cell membrane

Release substances from the cell via vesicles

Active transport... a) Requires energy in the form of ADP b) Requires energy in the form of ATP c) Releases energy in the form of ATP d) Releases energy in the form of ADP e) Does not require any energy and does not release any energy

Requires energy in the form of ATP

A red blood cell placed in a hypertonic medium will... a) Expand b) Burst c) Shrink d) Have no change in shape e) Become a white blood cell

Shrink

Which of the following will pass through a cell membrane most easily? a) Small polar molecules b) Small nonpolar molecules c) Large polar molecules d) Large nonpolar molecules e) Large neutral molecules

Small nonpolar molecules

Facilitated diffusion is used to transport... a) Sugars and Amino Acids b) H2O and O2 c) CO2 and O2 d) CO2 and H2O e) Sugars and H2O

Sugars and Amino Acids

The rate of diffusion is affected by which of the following? a) Temperature b) Size of Molecules c) Steepness of the Concentration Gradient d) Temperature and Size of the Molecules only e) Temperature, Size of the Molecules, and Steepness of the Concentration Gradient

Temperature, Size of the Molecules, and Steepness of the Concentration Gradient

When sugar is mixed with water, equilibrium is reached when... a) Molecules of sugar stop moving b) Water and sugar molecules are moving at the same speed c) The dissolved sugar molecules are evenly distributed throughout the solution d) There are the same number of water molecuels as dissolved sugar molecules e) two tablespoons of coffee are added

The dissolved sugar molecules are evenly distributed throughout the solution

True or False: A 5% urea solution is hypotonic to a 10% urea solution

True

True or False: Diffusion is one of the processes whereby materials are exchanged between a cell and its environment

True

True or False: Facilitated diffusion requires a specific transporter for a specific molecule

True

True or False: If a cell is placed in an isotonic medium, there will be no net movement of water

True

True or False: If the material the cell takes in is liquid, the process is termed pinocytosis

True

True or False: Low-density lipoproteins are brough into the cell by receptor-mediated endocytosis

True

Facilitated diffusion occurs... a) Into the cell only b) Out of the cell only c) In either direction depending on the temperature d) In either direction depending on the concentration gradient of the molecule e) In either direction depending on the size of the molecule

In either direction depending on the concentration gradient of the molecule

The __________ on the surface of a cell increase surface area, while the __________ assist with the movement of substances across the surface. a) Flagella; Cilia b) Cilia; Microvilli c) Cilia; Flagella d) Microvilli; Cilia

Microvilli; Cilia

Simple diffusion is defined as the movement of... a) Molecules from areas of higher concentration to areas of lower concentration b) Molecules from areas of lower concentration to areas of higher concentration c) Water molecules across a membrane d) Gas molecules across a membrane e) Gas or water molescules across a membrane

Molecules from areas of higher concentration to areas of lower concentration

Active transport moves to a solute... a) Up its concentration gradient, that is, from a low concentration to a high one b) Up its concentration gradient, that is, from a high concentration to a low one c) Down its concentration gradient, that is, from a low concentration to a high one d) Down its concentration gradient, that is, from a high concentration to a low one e) Across its concentration gradient, that is, from a high concentration to a low one

Up its concentration gradient, that is, from a low concentration to a high one