Homeostasis and Cell Processes

What is osmosis?

• The movement of solvent molecules from an area of lower solute concentration to an area of lower solute concentration through a semipermeable membrane.

• The movement of solute molecules from an area of higher solute concentration to an area of lower solute concentration through a semipermeable membrane.

• The movement of solvent molecules from an area of lower solute concentration to an area of higher solute concentration through a semipermeable membrane.

• The movement of solvent molecules from an area of higher solute concentration to an area of lower solute concentration through a semipermeable membrane.

Define active transport.

• The movement of molecules across a cell membrane with their concentration gradient, without the expenditure of energy.

• The movement of molecules across a cell membrane with their concentration gradient, requiring the expenditure of energy in the form of ATP.

• The movement of molecules across a cell membrane without the expenditure of energy.

• The movement of molecules across a cell membrane against their concentration gradient, requiring the expenditure of energy in the form of ATP.

What is passive transport?

• Process of molecules moving across a cell membrane with the use of energy.

• Process of molecules moving against the concentration gradient.

• Process of molecules moving through protein channels.

• Process of molecules moving across a cell membrane without the use of energy

In which direction does water move during osmosis?

• Water does not move during osmosis.

• Water moves in both directions during osmosis.

• Water moves from an area of lower solute concentration to an area of higher solute concentration.

• Water moves from an area of higher solute concentration to an area of lower solute concentration.

Give an example of active transport in the human body.

• Transport of oxygen in the lungs.

• Excretion of waste products in the kidneys.

• Synthesis of proteins in the liver.

• Absorption of glucose in the small intestine

Name two types of passive transport.

• facilitated diffusion

• active transport

• endocytosis

• diffusion and osmosis

What is the main difference between active and passive transport?

• Active transport is faster than passive transport due to the use of carrier proteins.

• Active transport involves the movement of molecules from an area of low concentration to an area of high concentration, while passive transport involves the movement of molecules from an area of high concentration to an area of low concentration.

• Active transport requires energy, while passive transport does not.

• Active transport occurs across a concentration gradient, while passive transport occurs against a concentration gradient.

Explain the process of osmosis in plant cells.

• Osmosis is the movement of water molecules from an area of lower water concentration to an area of higher water concentration through a selectively permeable membrane in plant cells.

• Osmosis is the movement of water molecules from an area of higher water concentration to an area of lower water concentration through a selectively permeable membrane in plant cells.

• Osmosis is the movement of solute molecules from an area of higher concentration to an area of lower concentration through a selectively permeable membrane in plant cells.

• Osmosis is the movement of water molecules from an area of higher solute concentration to an area of lower solute concentration through a selectively permeable membrane in plant cells.

How does active transport maintain homeostasis in cells?

• By allowing molecules to move freely across the cell membrane.

• By using passive transport to move molecules with their concentration gradient.

• By using energy to move molecules against their concentration gradient.

• By preventing the movement of molecules across the cell membrane.

Tags

NGSS.HS-LS1-3

What are the factors that affect the rate of passive transport?

• Pressure gradient, pH level, viscosity of the medium, and surface area of the cell membrane.

• Concentration gradient, temperature, size of the molecules, and permeability of the cell membrane.

• Presence of transport proteins, electrical charge, pH level, and size of the molecules.

• Temperature, concentration gradient, electrical charge, and viscosity of the medium.