Quiz - Chapter 6 (Cell Membrane)

What happens to a cell in a hypertonic solution? A) The cell becomes very thin and undergoes plasmolysis. B) The cell grows in size and might burst in a process called cytolysis. C) Water moves into the cell, making the net movement zero. D) Water moves out of the cell, making the cell shrink.

Answer: A and D

What are the two types of proteins involved in facilitated diffusion? A) Channel proteins and carrier proteins B) Channel proteins and receptor proteins C) Transporter proteins and carrier proteins D) Transporter proteins and receptor proteins

Answer: A) Channel proteins and carrier proteins

Which type of binding involves cells using the same protein to form a bond? A) Homotypic binding B) Heterotypic binding C) Extrinsic binding D) Integral binding

Answer: A) Homotypic binding

What are the three forms of cell junctions? A) Tight junctions, anchoring junctions, and gap junctions B) Extracellular matrix, transmembrane proteins, and cell adhesion molecules C) Passive transport, active transport, and secondary active transport D) Homotypic binding, heterotypic binding, and glycolipids

Answer: A) Tight junctions, anchoring junctions, and gap junctions

What is the main difference between channel and carrier proteins? A. Channel proteins provide a pore for substances to move across the membrane, while carrier proteins bind to and transport substances across the membrane. B. Channel proteins allow movement of substances in only one direction, while carrier proteins allow movement of substances in both directions. C. Carrier proteins expend energy to pump substances across the membrane against a concentration gradient, while channel proteins provide passage via facilitated diffusion of substances without expending energy. D. Carrier proteins provide a means for large, polar substances to move across the membrane, while channel proteins provide a means for small, nonpolar substances to pass through the membrane.

Answer: A. Channel proteins provide a pore for substances to move across the membrane, while carrier proteins bind to and transport substances across the membrane.

What happens when Na+ enters the cell with the help of Secondary Active transport? A. It takes with it other molecules when entering, like sugars B. It moves out of the cell, against the concentration gradient C. It combines with K+ to form a salt D. It becomes a part of the lipid bilayer

Answer: A. It takes with it other molecules when entering, like sugars

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Answer: B) Recognition sites

What happens to a cell in a hypotonic solution? A) The cell becomes very thin and undergoes plasmolysis. B) The cell grows in size and might burst in a process called cytolysis. C) Water moves into the cell, making the net movement zero. D) Water moves out of the cell, making the cell shrink.

Answer: B) The cell grows in size and might burst in a process called cytolysis.

Where does the energy come from for Secondary Active transport? A. Hydrolysis of ATP B. The ion concentration gradient established by Primary Active transport C. The movement of water molecules D. The binding of carrier proteins

Answer: B. The ion concentration gradient established by Primary Active transport

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Answer: C) Integral membrane proteins

What is the term used to describe a solution in which there is an equal concentration of solutes on both sides of a membrane? A) Hypertonic B) Hypotonic C) Isotonic D) Cytolysis

Answer: C) Isotonic

What happens to an animal cell when placed in a hypotonic solution? A) It shrinks B) It stays the same size C) It bursts D) It becomes rigid

Answer: C) It bursts

What is the function of tight junctions? A) Connect neighboring cells together B) Create a strong but flexible sheet of cells C) Seal cells tightly to form a barrier D) Allow small molecules to pass through the membrane

Answer: C) Seal cells tightly to form a barrier

What is facilitated diffusion? A) The active movement of molecules along the concentration gradient facilitated by proteins B) The passive movement of molecules against the concentration gradient facilitated by proteins C) The passive movement of molecules along the concentration gradient facilitated by proteins D) The active movement of molecules against the concentration gradient facilitated by proteins

Answer: C) The passive movement of molecules along the concentration gradient facilitated by proteins

What is the term used to describe a measure that compares the concentration of solutes inside and outside the cell? A) Osmosis B) Diffusion C) Tonicity D) Plasmolysis

Answer: C) Tonicity

What is the Sodium-Potassium Pump? A. A carrier protein that moves glucose across the membrane B. A uniport protein that moves sodium ions across the membrane C. An integral membrane antiport protein that moves substances in opposite directions D. A symport protein that moves potassium ions into the cell

Answer: C. An integral membrane antiport protein that moves substances in opposite directions

What type of substances do carrier proteins transport across the membrane? A. Nonpolar substances B. Small ions C. Polar molecules D. Large proteins

Answer: C. Polar molecules.

Which of the following is true about ion channels? A. They are activated by a physical stimulus B. They are activated by a change in voltage C. They are activated by a chemical signal D. They are activated by a change in temperature

Answer: C. They are activated by a chemical signal.

What is the function of the Sodium-Potassium Pump? A. To pump 3 K+ out of the cell and 2 Na+ into the cell B. To pump 2 K+ out of the cell and 3 Na+ into the cell C. To pump 3 Na+ out of the cell and 2 K+ into the cell D. To pump 2 Na+ out of the cell and 3 K+ into the cell

Answer: C. To pump 3 Na+ out of the cell and 2 K+ into the cell

What is the difference between passive and active transport? A) Passive transport requires energy, while active transport does not B) Active transport moves materials from an area of higher concentration to the lower, while passive transport does not C) Passive transport moves materials from an area of higher concentration to the lower, similar to active transport D) Active transport moves materials from an area of lower concentration to the higher, while passive transport does not

Answer: D) Active transport moves materials from an area of lower concentration to the higher, while passive transport does not

Which of the following is not a type of tonicity? A) Hypertonic B) Hypotonic C) Isotonic D) Mesotonic

Answer: D) Mesotonic

What is the purpose of gap junctions? A) To allow cells to stretch B) To connect neighboring cells together C) To serve as a barrier in the body D) To communicate and transfer molecules and ions between cells

Answer: D) To communicate and transfer molecules and ions between cells

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Answer: D) Transmembrane proteins

Which of the following is NOT a role of membrane proteins? a) Facilitated/Passive Diffusion b) Active Transport c) Signal Transduction d) Connect Cells Together e) Markers for Cell Identification

Answer: NONE, all of these are exactly what membrane proteins do

What is the driving force for active transport? a) Against the concentration gradient b) With the concentration gradient c) Requires energy d) Requires a membrane protein

Answer: a) Against the concentration gradient

What are the two ways membrane proteins can be contained in the membrane? a) Extend across the membrane or attach to one side only b) Extend only to one side of the membrane c) Contained within the lipid bilayer d) Attached to the membrane by cholesterol molecules

Answer: a) Extend across the membrane or attach to one side only

Is facilitated diffusion specific? a) Yes b) No c) Requires energy d) Requires a membrane protein

Answer: a) Yes

How do cells recognize one another before they start binding? a) By recognizing the signals given by glycoproteins b) By recognizing the signals given by glycolipids c) By recognizing the signals given by integral proteins d) By recognizing the signals given by extrinsic proteins

Answer: b) By recognizing the signals given by glycolipids

A cell with 3% salt with a body of 2% salt, which way will water move? a) From the cell to the body b) From the body to the cell c) Water will not move d) It depends on the size of the cell.

Answer: b) From the body to the cell

In which environment will a cell have water move from outside towards the high concentration of solute inside the cell? a) Hypertonic b) Hypotonic c) Isotonic d) None of the above

Answer: b) Hypotonic

What is the driving force for simple diffusion? a) Against the concentration gradient b) With the concentration gradient c) Requires energy d) Requires a membrane protein

Answer: b) With the concentration gradient

How does cholesterol affect the fluidity of the cell membrane? a) It makes the membrane more fluid b) It has no effect on membrane fluidity c) It makes the membrane stiffer and less fluid d) It causes the membrane to break down

Answer: c) It makes the membrane stiffer and less fluid

Which of the following is NOT a component of the cell membrane? a) Phospholipids b) Cholesterol c) Nucleotides d) Proteins

Answer: c) Nucleotides

How do unsaturated and shorter fatty acid tails affect the fluidity of the membrane? a) They decrease the fluidity b) They have no effect on fluidity c) They increase the fluidity d) They make the membrane rigid

Answer: c) They increase the fluidity

Which of the following best describes why active processes require energy? a) They move substances with the concentration gradient b) They move substances through protein channels c) They move substances against the concentration gradient d) They move substances via facilitated diffusion

Answer: c) They move substances against the concentration gradient.

What is the function of the cell membrane? a) To control the movement of all molecules in and out of the cell b) To allow free movement of all molecules in and out of the cell c) To protect the cell from external factors d) To maintain the cell shape

Answer: c) To protect the cell from external factors

The plasma membrane has specialized channels called Aquaporin for the movement of which substance? a) Oxygen b) Carbon dioxide c) Water d) Ions

Answer: c) Water

Which process is required to move substances against their concentration gradient from low to high concentration? a) Simple diffusion b) Facilitated diffusion c) Osmosis d) Active transport

Answer: d) Active transport

What kind of protein carriers are involved in active transport? a) Uniports b) Symports c) Antiports d) All of the above

Answer: d) All of the above

Which of the following is NOT a form of passive transport? a) Simple diffusion through the lipid bilayer b) Facilitated diffusion through protein channels c) Facilitated diffusion through carrier proteins d) Antiport transport

Answer: d) Antiport transport

In what type of cells is Pinocytosis a constant process? a) Muscle cells b) Epithelial cells c) Nerve cells d) Endothelial (capillary) cells

Answer: d) Endothelial (capillary) cells

What is Pinocytosis in Endocytosis? a) Engulfing of molecules to form vesicles b) Folding in of the plasma membrane around the material c) Formation of a food vacuole or phagosome d) Formation of small vesicles to bring fluids into the cell

Answer: d) Formation of small vesicles to bring fluids into the cell

What is the main difference between integral and extrinsic membrane proteins? a) Integral proteins are hydrophilic, while extrinsic proteins are hydrophobic b) Integral proteins do not cross the whole bilayer, while extrinsic proteins do c) Extrinsic proteins are transmembrane, while integral proteins are not d) Integral proteins have both hydrophobic and hydrophilic amino acids, while extrinsic proteins have only hydrophilic amino acids

Answer: d) Integral proteins have both hydrophobic and hydrophilic amino acids, while extrinsic proteins have only hydrophilic amino acids

What fuses with a lysosome in Phagocytosis? a) The plasma membrane b) The vesicle membrane c) The food vacuole d) The phagosome

Answer: d) The phagosome

What is the function of carrier proteins in facilitated diffusion? a) They provide a pore for substances to move across the membrane b) They move substances in only one direction c) They pump substances across the membrane against a concentration gradient d) They bind to the substances they transport and change shape

Answer: d) They bind to the substances they transport and change shape

What is the function of carbohydrates in cell membranes? a) To regulate fluidity of the membrane b) To transport molecules across the membrane c) To provide structural support to the membrane d) To serve as recognition sites allowing cells to recognize one another

Answer: d) To serve as recognition sites allowing cells to recognize one another

What is the function of carbohydrates in cell membranes? A) Act as recognition sites B) Transport molecules across the membrane C) Strengthen cell connections D) Regulate membrane fluidity

Answer: A) Act as recognition sites

What is the term used to describe the general structure of membranes? a) Fluid mosaic b) Phospholipid bilayer c) Protein channel model d) Cholesterol framework

Answer: a) Fluid mosaic

What is the process used to bring molecules into the cell when they are too large for active transport? a) Osmosis b) Endocytosis c) Exocytosis d) Pinocytosis

Answer: b) Endocytosis

How does secondary active transport create the concentration gradient required for the movement of ions? a) Directly uses ATP b) Indirectly uses ATP c) Does not require ATP d) Uses selective protein carriers

Answer: b) Indirectly uses ATP

What is the other name for integral membrane proteins? a) Extracellular proteins b) Transmembrane proteins c) Peripheral proteins d) Hydrophobic proteins

Answer: b) Transmembrane proteins

What type of protein carrier is the Sodium-Potassium Pump? a) Uniport b) Symport c) Antiport d) Non-port

Answer: c) Antiport

What is the source of energy for primary active transport? a) Energy from glucose b) Energy from sunlight c) Energy from ATP d) Energy from oxygen

Answer: c) Energy from ATP

What is Phagocytosis in Endocytosis? a) Engulfing of molecules to form vesicles b) Folding in of the plasma membrane around the material c) Formation of a food vacuole or phagosome d) Constant acquisition of fluids by endothelial cells

Answer: c) Formation of a food vacuole or phagosome

When the substance being moved across the membrane is water, the process is called? a) Active transport b) Facilitated diffusion c) Osmosis d) Simple diffusion

Answer: c) Osmosis

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Answer: c) Symports move two substances in the same direction, while antiports move a single substance in one direction

What is Exocytosis? a) Engulfing of molecules to form vesicles b) Folding in of the plasma membrane around the material c) Formation of a food vacuole or phagosome d) Vesicle membrane fusing with the plasma membrane or a pore forming

Answer: d) Vesicle membrane fusing with the plasma membrane or a pore forming

Quiz about Cell Membrane (Please Inform us if you find a mistake)

By the Open Book Team