#1
Which process involves the movement of molecules from an area of high concentration to an area of low concentration?
Diffusion
ExplanationPassive movement of particles down their concentration gradient.
#2
Which of the following is an example of passive transport?
Facilitated diffusion
ExplanationMovement across the membrane without energy expenditure.
#3
What is the primary driving force behind osmosis and diffusion?
Kinetic energy
ExplanationRandom movement powered by molecular motion.
#4
In osmosis, water moves across a semi-permeable membrane to equalize the concentration of solutes. Which direction does water move?
From an area of low water concentration to high water concentration
ExplanationWater flows to balance solute concentrations.
#5
Which factor does not affect the rate of diffusion?
Color of molecules
ExplanationDiffusion is independent of the color of the diffusing molecules.
#6
What type of solution causes a cell to shrink due to water leaving the cell?
Hypertonic
ExplanationHigher solute concentration outside, leading to water loss and cell shrinkage.
#7
Which of the following best describes facilitated diffusion?
Movement of molecules from high to low concentration with the help of a carrier protein
ExplanationPassive transport aided by carrier proteins.
#8
Which of the following best describes the function of cholesterol in the cell membrane?
Provides structural support
ExplanationCholesterol contributes to membrane stability and integrity.
#9
Which statement is true regarding the movement of water molecules during osmosis?
Water moves to balance solute concentration on both sides of the membrane
ExplanationWater shifts to equalize solute concentrations.