Pharmacy Practice MCQ » PHARMACAREERS

Pharmacy Practice MCQ, in this article we will solve, Practice MCQ on the topic, diffusion principles in biological systems, under subject physical pharmaceutics. Read following article for your reference.

Diffusion Principles In Biological Systems » PHARMACAREERS

What is diffusion?
- A) Movement of molecules from low to high concentration
- B) Movement of molecules from high to low concentration
- C) Movement of molecules without a concentration gradient
- D) Movement of molecules with the use of energy
Which law describes the rate of diffusion?
- A) Boyle’s Law
- B) Charles’s Law
- C) Fick’s Law
- D) Avogadro’s Law
What is passive diffusion?
- A) Movement of molecules with energy
- B) Movement of molecules against the concentration gradient
- C) Movement of molecules along the concentration gradient without energy
- D) Movement of molecules through active transport
What is facilitated diffusion?
- A) Diffusion without the help of proteins
- B) Diffusion with the help of membrane proteins
- C) Diffusion against the concentration gradient
- D) Diffusion with the use of ATP
Which of the following is an example of passive diffusion?
- A) Glucose entering cells via transporters
- B) Oxygen diffusing from blood vessels into cells
- C) Sodium ions moving through ion channels
- D) Potassium ions moving out of nerve cells
What is active transport?
- A) Movement of molecules along the concentration gradient
- B) Movement of molecules without energy
- C) Movement of molecules against the concentration gradient with energy
- D) Movement of molecules through passive diffusion
Which molecule is commonly involved in active transport?
- A) ATP
- B) Glucose
- C) Oxygen
- D) Carbon dioxide
What is the role of membrane proteins in facilitated diffusion?
- A) They provide energy for diffusion
- B) They create channels or carriers for specific molecules
- C) They prevent diffusion
- D) They degrade molecules
Which of the following is NOT a type of diffusion?
- A) Passive diffusion
- B) Facilitated diffusion
- C) Active transport
- D) Osmosis
What is the driving force for passive diffusion?
- A) ATP
- B) Concentration gradient
- C) Membrane proteins
- D) Enzymes
Which law states that the rate of diffusion is proportional to the concentration gradient?
- A) Fick’s First Law
- B) Fick’s Second Law
- C) Boyle’s Law
- D) Charles’s Law
What does Fick’s Second Law describe?
- A) The rate of diffusion
- B) The change in concentration with time
- C) The diffusion coefficient
- D) The concentration gradient
What is the diffusion coefficient (D)?
- A) A measure of the concentration gradient
- B) A property dependent on the nature of the diffusing substance and the medium
- C) A measure of the rate of diffusion
- D) A measure of the surface area
Which factor does NOT influence the rate of diffusion?
- A) Concentration gradient
- B) Temperature
- C) Surface area
- D) Color of the substance
What is the role of the concentration gradient in diffusion?
- A) It provides energy for diffusion
- B) It determines the direction and rate of diffusion
- C) It prevents diffusion
- D) It degrades molecules
What is the significance of the diffusion coefficient (D)?
- A) It indicates the energy required for diffusion
- B) It determines the rate of diffusion
- C) It measures the concentration gradient
- D) It measures the surface area
Which of the following is an example of facilitated diffusion?
- A) Oxygen diffusing into cells
- B) Glucose entering cells via glucose transporters
- C) Carbon dioxide diffusing out of cells
- D) Water moving through osmosis
What is the main difference between passive and facilitated diffusion?
- A) Passive diffusion requires energy, facilitated does not
- B) Facilitated diffusion requires membrane proteins, passive does not
- C) Passive diffusion moves molecules against the gradient, facilitated does not
- D) Facilitated diffusion is slower than passive diffusion
What is the role of ion channels in facilitated diffusion?
- A) They provide energy for diffusion
- B) They create pathways for ions to move across membranes
- C) They prevent ion movement
- D) They degrade ions
Which process involves the movement of molecules against their concentration gradient?
- A) Passive diffusion
- B) Facilitated diffusion
- C) Active transport
- D) Osmosis
What is the primary energy source for active transport?
- A) Glucose
- B) ATP
- C) Oxygen
- D) Carbon dioxide
Which of the following is an example of active transport?
- A) Oxygen diffusing into cells
- B) Glucose entering cells via glucose transporters
- C) Sodium-potassium pump
- D) Water moving through osmosis
What is the role of the sodium-potassium pump in cells?
- A) It facilitates passive diffusion
- B) It moves sodium and potassium ions against their concentration gradients
- C) It provides energy for diffusion
- D) It degrades sodium and potassium ions
Which factor can increase the rate of diffusion?
- A) Decreasing the concentration gradient
- B) Increasing the temperature
- C) Decreasing the surface area
- D) Increasing the size of the diffusing molecules
What is the effect of temperature on diffusion?
- A) Higher temperatures decrease the rate of diffusion
- B) Higher temperatures increase the rate of diffusion
- C) Temperature has no effect on diffusion
- D) Lower temperatures increase the rate of diffusion
What is the significance of surface area in diffusion?
- A) Larger surface area decreases the rate of diffusion
- B) Larger surface area increases the rate of diffusion
- C) Surface area has no effect on diffusion
- D) Smaller surface area increases the rate of diffusion
Which of the following best describes osmosis?
- A) Movement of solutes from high to low concentration
- B) Movement of water from low to high solute concentration
- C) Movement of water from high to low solute concentration
- D) Movement of solutes against the concentration gradient
What is the role of the concentration gradient in osmosis?
- A) It provides energy for osmosis
- B) It determines the direction of water movement
- C) It prevents osmosis
- D) It degrades water molecules
Which of the following is NOT a factor influencing diffusion?
- A) Concentration gradient
- B) Temperature
- C) Surface area
- D) Molecular weight of the solvent
What is the primary difference between diffusion and osmosis?
- A) Diffusion involves solutes, osmosis involves water
- B) Osmosis requires energy, diffusion does not
- C) Diffusion moves molecules against the gradient, osmosis does not
- D) Osmosis is faster than diffusion

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