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WorksheetsMembrane structure and function
Total questions: 69
Worksheet time: 23mins
The thin, flexible barrier around a cell is called the ........
Plasma membrane
Cell wall
Nuclear envelope
Cytoplasm
The main function of the cell wall is to:
Support and protect the cell
Store DNA
Help in cell motility
Direct the activities of the cell
Diffusion is the movement of particles from:
An area of equilibrium to an area of high concentration
An area of high concentration to an area of low concentration
An area of low concentration to an area of high concentration
All of the above
Diffusion of water is:
Facilitated diffusion
Active transport
Osmosis
Exocytosis
This type of diffusion requires the help of protein channels
Osmosis
Diffusion
Sodium-potassium pump
Facilitated diffusion
This is an active transport process where the plasma membrane forms a pouch to surround something and bring it into the cell:
Sodium-potassium pump
Cotransport
Endocytosis
Exocytosis
Molecules moves against their concentration gradients. The cell must use energy to make this happen:
Diffusion
Osmosis
Active transport
Facilitated diffusion
This is an active transport process where a vesicle inside the cell fuses with the plasma membrane to release contents to the outside of the cell:
Exocytosis
Pinocytosis
Phagocytoses
Receptor-mediated endocytosis
These organic compounds are found floating around in a sea of phospholipids. they sometimes form channels or pumps for moving substances in and out of the cell:
Carbohydrates
Proteins
Nucleic acids
Lipids
Which of the following best describes the lipid bilayer present in the plasma membrane?
Phospholipids in single layer with heads facing outside the cell
Phospholipids in double layer with heads of both layers meeting in middle
Phospholipids in single layer with heads facing inside the cell
Phospholipids in double layer with tails facing each other and heads on both the inside and outside of the cell
Which of the following is not true of the fluid mosaic model?
Proteins float among the phospholipids
Carbohydrate chains may extend off of the plasma membrane
Cholesterol damages the plasma membrane
Phospholipids and some protein may move around
Which of the following describes a cell that has an equal amount of solute as its environment?
Hypotonic
Hypertonic
Isotonic
Osmotic
Allowing certain molecules to diffuse across the membrane:
Diffusion
Osmosis
Facilitated diffusion
Ionic
If a solution is hypotonic the concentration of solutes is less than it is inside the cell:
there will be no net movement of water.
The cell lose water
The cell will gain water
All of the above.
The process where water diffuses through equal concentrations.
In hypotonic solution
In isotonic solution
In hypertonic solution
(A) and (C)
Which of these describes the process sodium-potassium pump?
Osmosis
Diffusion
Active transport
Photosynthesis
What is the function of the proteins in the cell membrane?
Transport
Signal transduction
Intercellular joining
All of the above
The movement of oxygen into a cell until equilibrium is reached without the use of ATP is an example of:
Active transport
Osmosis
Passive transport
Oxidation reaction
Diffusion don’t require ...........
Energy
Work done
Protein aiding
All of the above
Which of the following is not active transport?
Sodium-potassium pump
Facilitated diffusion
Cotransport
Bulk transport
This solution has the highest concentration of water molecules:
Hypertonic solution
Isotonic solution
Hypotonic solution
All of the above
This solution has the highest concentration of solutes:
Hypertonic solution
Isotonic solution
Hypotonic solution
All of the above
Substances move against their concentration gradient:
Facilitated diffusion
Active transport
Osmosis
Passive transport
The cell gulps droplets of extracellular fluid into tiny vesicles:
Phagocytosis
Pinocytosis
Receptor-mediate endocytosis
Exocytosis
What is the outer boundary of the cell?
cell wall
plasma membrane
nuclear lamina
endoplasmic reticulum
Which of the following describes the fluid-mosaic model of the plasma membrane structure?
phospholipid monolayer with embedded proteins.
phospholipid bilayer with embedded proteins.
phospholipid tri-layer with embedded proteins.
triglyceride bilayer with embedded proteins.
Which of the following statements is NOT correct about the phospholipid molecules in the plasma membrane?
The polar heads face outward.
The nonpolar tails face inward.
The polar heads are hydrophobic.
The nonpolar tails are hydrophobic.
Which of the following molecules would NOT be found in animal plasma membranes?
Nucleic acids
Proteins
Phospholipids
Cholestrol
Which type of protein in the plasma membrane has carbohydrate attached to it so that cells can be distinguished from each other?
Transport protein
Enzymatic protein
Cell- cell recognition protein
Signal transduction protein
A ........ protein allows a particular molecule or ion to freely cross the plasma membrane as it enters or exits the cell.
Transport protein
Enzymatic protein
Cell- cell recognition protein
Signal transduction protein
A ..... protein has a specific shape such that only a particular molecule can bind to it.
Transport protein
Enzymatic protein
Cell- cell recognition protein
Signal transduction protein
Which statement best describes the plasma membrane?
It is freely permeable to all substances
It is nonpermeable to all substances
It is selectively permeable to certain substances
None of the above
Pinocytosis is a type of ..........
Diffusion
Facilitated diffusion
Exocytosis
Endocytosis
Tonicity refers to the .......
Strength of a muscle contraction
Strength of a solution in relationship to pinocytosis
Ability of a solution to cause a cell to gain or lose water
Strength of a solution in relationship to active transport
Which type of solution will cause cells to shrink or to shrivel?
hygrotonic solution
Hypotonic solution
Hypertonic solution
Isotonic solution
Which type of solution will cause cells to swell, or even to burst?
hygrotonic solution
Hypotonic solution
Hypertonic solution
Isotonic solution
….. is determine most of the plasma membranes specific functions.
Carbohydrates
Glycolipids
Glycoproteins
Protein
What prevents water-soluble molecule from entering cells across the plasma membrane?
Carbohydrates
Glycoprotein
Membrane channel proteins
Phospholipid bilayer
Plant cells in hypotonic environment is:
Lose water
Turgid
Wilt
Lethal effect
The plasma membrane is not:
Surrounding the cell
Separating nucleus contents from the cytoplasm
Selective permeable
None of the above
Plant cell is firm in:
Isotonic
Hypertonic
Hypotonic
All of the above
All of the following are correct regarding plasma membrane except:
Membranes switch from a fluid state to a solid state at low temperature
Types of lipids determined membrane fluidity
Membrane must be fluid to work properly
None of the above
If plant cell is flaccid, which of the following is incorrect?
plant may welt
Isotonic environment
no net movement of solute
cells become limp
If plant cell is plasmolysis, which of the following is incorrect?
Hypotonic environments
Plant cells lose water
Membrane pulls away from the wall
Lethal effect
Which of the following cells usually use cotransport?
Animal cell
Plant cell
Bacterial cell
All of the above
The difference between the lipid and protein composition between the membranes of the endomembrane system is largely determined by
The physical separation of most membranes from each other
The function of Golgi apparatus in sorting membrane components
The transportation of membrane among endomembrane system by small membrane vesicles
The modification of the membrane components once they reach final destination
The rate of osmosis a cell membrane depends upon which of the following?
I. Intracellular solute concentration
II.Extracellular solute concentration
III. Polarity of solutes.
IV. The presence of aquaporions
I , II and IV
I and II
III and IV
IV only
Why does active transport require energy?
To move solutes against a concentration gradient.
To transport small hydrophopic molecules across the membrane.
To move solutes to an equal concentration inside and outside the cell.
To move solutes with concentration gradient.
Bacterial cells are often found in very hypotonic environments. Which of the following characteristics keeps them from continuing to take on water from their environment?
The presence of a cell wall allows a buildup of turgor pressure that prevents any more water from entering the cell.
The presence of a cell wall allows a buildup of tonic pressure that prevents any more water from entering the cell.
The cell expels water as fast as it takes it up.
None of the above
All of the following statements regarding membranes are correct Except.
Glycoprotein are involved in cell-cell recognition
Peripheral proteins may display enzymatic functions
Cell surface receptors proteins transfer small polar substances into the cell
None of a bove.
The passive transport of an ion through a protein carrier into a cell represents which of the following?
facilitated diffusion
Osmosis
Phagocytosis
Active transport
Which type of integral membrane protein helps molecules move across the cell membrane by binding and releasing them?
Pore
Hydrophobic
Channel
Carrier
Which statement best describe how cholesterol affects cell membrane fluidity?
Cholesterol increases fluidity at high temperature and increases fluidity at low temperature.
Cholesterol increases fluidity at high temperature and decreases fluidity at low temperature.
Cholesterol decreases fluidity at high temperature and increases fluidity at low temperature.
Cholesterol decreases fluidity at high temperature and decreases fluidity at low temperature.
Which molecules diffuses through a membrane most quickly?
Hydrocarbon
Sodium ions
Carbohydrates
Glucose
Active transport is not:
Moves substances against their concentration
transport using phospholipids
Requires energy
All of the above
An animal cell lacking oligosaccharides on the external surface of its plasma membrane would likely be impaired in which function?
transporting ions against an electrochemical gradient.
Cell-cell recognition
Transduction
Establishing a diffusion barrier to charged molecules
The membrane of winter wheat can remain fluid when it is extremely cold by….
Increasing the percentage of unsaturated phospholipids in the membrane
Increasing the percentage of cholesterol molecules in the membrane
Decreasing the number of the hydrophobic protein in the membrane.
Increasing the length of the fatty acids.
For a protein to be an integral membrane protein, it would have to be ….
Hydrophilic
Hydrophobic
Amphipathic, with at least one hydrophobic region
Exposed on only one surface of the membrane
The presence of cholesterol in the plasma membranes of some animals:
enables the animal to add hydrogen atoms to unsaturated phospholipids.
enables the animal to remove hydrogen atoms from saturated phospholipids.
makes the membrane less flexible, allowing it to sustain greater pressure from cell wall
enable the membrane to stay fluid more easily when cell temperature drops.
Which statement represents a notable difference between simple and facilitated diffusion.
Unlike simple diffusion, the rate of facilitated diffusion is limited by the number of transport proteins in the membrane.
Unlike simple diffusion, facilitated diffusion requires energy in the form of ATP
Unlike simple diffusion, facilitated diffusion can transport ligands against a concentration gradient.
Unlike simple diffusion, facilitated diffusion can occur in any type of cell
Glucose typically enters the cell through which mechanism?
Pinocytosis through a channel protein
Facilitated diffusion through a carrier protein.
Active transport by a transport glucose protein
Simple diffusion through the cell membrane.
Cell Exocytosis is not:
Use to export their products
engulfs a particles in a vacuole
Use energy
All of the above
If a plant cell and its surroundings are isotonic, the cell is
Firm
lethal effect
may wilt
All of the above
Integral protein is contain…………… of amino acid.
Hydrophobic
Hydrophilic
Hydrophobic and hydrophilic
None of the above
The degree of plasma membrane solidified is depend on:
lipids contains
types of lipids
cholesterol contents
types of cholesterol
The passive transport of an ion through a protein carrier into a cell represents which of the following?
Osmosis
Phagocytosis
Facilitated diffusion
Exocytosis
Sucrose crosses the membrane by:
Cotransport
Transport vesicle
Diffusion
Facilitated diffusion
Passive transport included facilitated diffusion that is :
Transport water
No energy investment
Use transport protein
All answers are correct
If plant cell and surrounding solution are hypotonic the cell is:
Lysed
Shrivelled
Normal
All answers are corrects
