WorksheetsPropiedades de los fosfolípidos
Total questions: 58
Worksheet time: 29mins
Which term describes the property of phospholipid heads that love water?
Hydrophobic
Hydrophilic
Lipophilic
Lipophobic
What structure is formed by grouping the fatty acid tails in the middle of the membrane?
Hydrophilic barrier
Lipophilic barrier
Hydrophobic barrier
Isotonic barrier
What is the main function of the hydrophobic barrier in the cell membrane?
Allow the free movement of water molecules
Facilitate the mixing of hydrophobic and hydrophilic molecules
Prevent the easy movement of water and water-loving molecules
Increase the chemical reactivity of the cell
What is water composed of according to the image?
1 hydrogen and 2 oxygens
2 hydrogens and 1 oxygen
2 oxygens and 1 hydrogen
3 hydrogens
What happens when electrons are shared in the formation of water?
A physical bond is created
A proton is transferred
A chemical bond is formed
Nothing special happens
In the chemical bonds of water, how are the electrons distributed?
Equally between the oxygen and the hydrogens
Mainly towards the hydrogens
Mainly towards the oxygen
Electrons are not shared
Why is water considered a polar molecule?
Because it has an ionic bond
Because it has partial positive and negative charges
Because it has no electrical charges
Because it is symmetrical
What other substances are considered polar according to the information in the image?
Carbon and helium
Glucose, insulin, and ATP
Nitrogen and oxygen
Sodium and chlorine
What type of molecules can diffuse through the membrane because they match the chemical properties of the fatty acid tails?
Hydrophilic molecules
Large and polar molecules
Hydrophobic and nonpolar gases
Charged ions
Why can nonpolar molecules like gases diffuse through the membrane?
Because they have positive and negative regions
Because they do not have positive or negative regions
Because they are large and complex
Because they are soluble in water
Which of the following statements is true regarding polar molecules in relation to their permeability through the membrane?
All polar molecules can easily pass through the membrane
Large polar molecules can pass between the fatty acid tails
Polar molecules cannot pass through the membrane
Only small polar molecules can pass between the fatty acid tails
Which of the following is considered the "favorite food" of a cell according to the text?
Proteins
Glucose
Ions
Fatty acids
Why are transport proteins necessary for the movement of certain molecules in cells?
Because the molecules are small and nonpolar
Because the molecules are large and polar
Because the molecules can move freely without help
Because the molecules are hydrophobic
What characteristic makes an ion completely positive or completely negative?
Having an extra electron
Having an extra proton
Losing a neutron
Losing an electron
What do the blue arrows in the diagram indicate about membrane permeability?
That molecules need a transport protein to move through the membrane.
That molecules can diffuse directly through the plasma membrane.
That molecules are repelled by the membrane.
That molecules require energy for their transport.
What is the function of the black arrows in the diagram?
They indicate the simple diffusion of molecules across the membrane.
Show that the molecules are inert and cannot cross the membrane.
Indicate that a carrier protein is necessary to move the molecule across the membrane.
Suggest that all molecules can pass freely.
What type of transport through the plasma membrane does NOT require energy?
Active transport
Osmosis
Phagocytosis
Exocytosis
What is the process called where hydrophobic and nonpolar molecules cross the plasma membrane?
Facilitated diffusion
Simple diffusion
Active transport
Endocytosis
In facilitated diffusion, what type of molecules pass through the plasma membrane?
Hydrophobic and nonpolar
Hydrophilic, polar, and large
Small and nonpolar
Gases like oxygen and carbon dioxide
What type of protein do molecules use to move through the plasma membrane in facilitated diffusion?
Channel protein
Carrier protein
Aquaporin
Glucose
How do molecules move in simple diffusion across the plasma membrane?
Changing the shape of proteins
Using a transport protein
Directly through the membrane without assistance
Through aquaporins
In osmosis, what type of molecule does a transport protein use to cross the plasma membrane?
Ions
Glucose
Amino acids
Water
What is the name of the liquid part of a solution?
Solute
Solution
Solvent
Concentrate
What are the things dissolved in a solution called?
Solvents
Solutions
Solutes
Concentrates
What does the concentration of a solution indicate?
The amount of solvent in the solution
The number of solutes dissolved in it
The temperature of the solution
The viscosity of the solution
If a solution has a high concentration, what does this mean regarding the amount of solutes?
It has few solutes
It has a moderate amount of solutes
It has no solutes
It has many solutes
What does a low concentration solution represent in terms of solutes?
It has no solutes
It has a moderate amount of solutes
It has many solutes
It has few solutes
What is a concentration gradient according to the text?
A physical barrier that prevents the movement of molecules
The amount of solute dissolved in a solvent
The difference in concentration between two solutions
A type of energy that moves molecules
What requires energy according to the text?
Moving up a concentration gradient
Simple diffusion
Facilitated diffusion
Moving down a concentration gradient
How do molecules move in relation to their concentration gradient?
From an area of low concentration to an area of high concentration
From an area of equal concentration to another
From an area of high concentration to an area of low concentration
Randomly without a defined direction
What type of process is simple diffusion?
An active process that requires energy
A process that only occurs in living cells
A passive process that does not require energy
A process that alters the solute concentration
What happens to the salt concentration in the fluids outside your cells when you drink water?
A) Increases
B) Decreases
C) Remains the same
D) Doubles
What does a higher salt concentration compared to the water concentration in a cell indicate?
A) Higher water concentration
B) Lower water concentration
C) Does not affect water concentration
D) Balances the water concentration
Which direction does water move when it enters a cell according to the process of osmosis?
A) From a region of low water concentration to a region of high water concentration
B) From a region of high water concentration to a region of low water concentration
C) From a region of high salt concentration to a region of low salt concentration
D) From a region of low salt concentration to a region of high salt concentration
What happens to the fluid outside your cells when you are dehydrated according to the image?
It becomes hypotonic to the cytosol.
It becomes isotonic to the cytosol.
It becomes hypertonic to the cytosol.
It does not change in relation to the cytosol.
Under "normal" conditions, how is the fluid outside the cells compared to the cytosol?
Hypotonic
Hypertonic
Isotonic
Variable
What happens when you drink a lot of water in relation to the fluid outside your cells?
It becomes hypertonic to the cytosol.
It becomes isotonic to the cytosol.
It does not change in relation to the cytosol.
It becomes hypotonic to the cytosol.
What does NOT require passive transport to function?
Transport proteins
Energy
Solute concentration
Plasma membrane
What type of passive transport involves the movement of water across the membrane?
Diffusion
Facilitated diffusion
Osmosis
Active transport
In passive transport, how do molecules move relative to their concentration gradient?
From areas of low concentration to areas of high concentration
From areas of high concentration to areas of intermediate concentration
From areas of high concentration to areas of low concentration
Randomly, without a defined direction
What type of diffusion requires a transport protein to move molecules across the plasma membrane?
Osmosis
Simple diffusion
Facilitated diffusion
Active transport
What type of energy does active transport use to move molecules against their concentration gradient?
Thermal energy
Mechanical energy
ATP
Solar energy
What happens when the bonds of ATP are broken in the process of active transport?
Light is released
Energy is absorbed
Energy is released
ATP is created
In active transport, what happens when a molecule moves down its concentration gradient?
Pushes another molecule down its own gradient
Does not require energy
Pushes another molecule up its own gradient
Changes the temperature of the cell
What does the cell first use to pump sodium (Na+) out of it?
Glucose
Potassium (K+)
ATP
Concentration gradient
What does the sodium (Na+) concentration gradient allow in the cell?
The cell stores ATP
The cell expels glucose
The movement of Na+ back into the cell
The cell produces potassium (K+)
How does the cell "surreptitiously introduce" glucose?
Using ATP directly
Through the Na+ concentration gradient
Expelling K+ out of the cell
Decreasing the glucose concentration inside the cell
What is the result of the processes described in the image?
The cell produces more ATP
The cell accumulates its "favorite food"
The cell eliminates all Na+ ions
The cell increases the concentration of K+ inside
What is the main function of the rough endoplasmic reticulum in a cell?
Production of lipids
Protein synthesis
Digestion of carbohydrates
Transport of oxygen
Which organelle is primarily responsible for energy production in the cell?
Nucleus
Ribosome
Mitochondria
Lysosome
¿Qué estructura de la célula está implicada principalmente en el proceso de digestión y reciclaje de materiales celulares?
Golgi Complex
Vacuola
Lisosomas
Cilios
¿Cuál es la función principal del sistema endomembranoso en la célula?
Producir carbohidratos
Transportar oxígeno
Fabricar y transportar proteínas y lípidos
Generar impulsos eléctricos
¿Dónde se ensamblan las proteínas a partir de polipéptidos en la célula?
En el núcleo
En el retículo endoplásmico rugoso
En el complejo de Golgi
En la membrana celular
¿Qué ocurre con las proteínas dentro del complejo de Golgi?
Se sintetizan
Se descomponen
Se procesan y almacenan
Se expulsan directamente al exterior
¿Cómo se transportan las proteínas terminadas desde el complejo de Golgi hasta la membrana celular?
A través de ribosomas
Mediante vesículas de transporte
Por difusión directa
Usando filamentos de actina
¿Qué tipo de células tienen núcleo?
Procariontes
Eucariontes
Virus
Todas las anteriores
¿Cuál es el único orgánulo que tienen los procariontes según el texto?
Mitocondrias
Ribosomas
Núcleo
Cloroplastos
¿Dónde se encuentra la información genética en las células procariontes?
En la núcleo
En el nucleolo
En la región nucleoide
En las mitocondrias
