WorksheetsA&P Ch. 3 PLTL
Total questions: 31
Worksheet time: 16mins
Which structure is considered the "control center" of the cell?
Define "active transport" in the context of cellular physiology.
The movement of substances across a membrane using energy, typically ATP, against their concentration gradient.
The passive movement of substances from an area of high concentration to an area of low concentration.
The process by which large particles are engulfed by the cell membrane and transported into the cell.
The exchange of materials between a cell and its environment through vesicles.
The phospholipid bilayer of the plasma membrane consists of a single layer of phospholipids.
True
False
What is the role of the sodium-potassium pump (Na⁺-K⁺ ATPase) in cellular function?
It helps maintain the resting membrane potential of cells.
It facilitates the diffusion of ions down their concentration gradients.
It is involved in the synthesis of ATP.
It regulates the movement of water molecules across the cell membrane.
Which of the following is NOT a function of the plasma membrane?
Cell recognition and communication
Define "primary active transport" in the context of cellular physiology.
The passive movement of substances from an area of high concentration to an area of low concentration.
The process by which water molecules move across a semipermeable membrane to equalize solute concentrations.
The movement of substances across a membrane using energy derived directly from the hydrolysis of ATP.
The exchange of materials between a cell and its environment through vesicles.
The extracellular fluid (ECF) refers to the fluid found inside the cell.
True
False
Define "Organelle" in the context of cell biology.
The semi-permeable barrier that separates the cell from its external environment.
The fluid-filled region within a cell, excluding the nucleus.
The outermost layer of a cell, responsible for providing structural support and protection.
A membrane-bound structure within a cell that performs specific functions necessary for cell survival.
What is tonicity?
The concentration of solutes inside a cell compared to the concentration outside the cell.
The ability of a solution to cause a cell to shrink or swell.
The pressure exerted by a fluid at equilibrium within the cell.
The movement of water across a semipermeable membrane.
Explain the term "symporter" as it relates to membrane transport.
A membrane protein that allows ions or molecules to move freely across the membrane.
A membrane protein that requires ATP to transport ions or molecules against their concentration gradient.
A membrane protein that exchanges two different ions or molecules in opposite directions.
A membrane protein that transports two different ions or molecules in the same direction.
Simple diffusion is best described as the movement of:
Water across a semipermeable membrane to equalize solute concentrations.
Substances from an area of lower concentration to an area of higher concentration, using energy.
Substances from an area of higher concentration to an area of lower concentration, without the use of energy.
Large particles or molecules into the cell through engulfment by the cell membrane.
The concept that states all living organisms are composed of cells, and that cells are the basic units of structure and function in living organisms is known as:
What are integral proteins in the context of the plasma membrane?
Proteins that are loosely attached to the surface of the membrane
Proteins that span the entire width of the membrane and are firmly embedded within it.
Proteins that are involved in cell recognition and adhesion.
Proteins that are primarily involved in cell signaling.
Osmosis specifically refers to the movement of:
Water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Water across a semipermeable membrane from an area of higher solute concentration to an area of lower solute concentration.
Solutes across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration.
Solutes across a semipermeable membrane from an area of lower water concentration to an area of higher water concentration.
Osmolarity refers to the concentration of solutes outside the cell compared to the concentration inside the cell.
True
False
What is the function of cholesterol in the plasma membrane?
To provide structural support
To facilitate cell communication
To regulate membrane fluidity
To aid in transport across the membrane
Define "crenation" and "lysis" in the context of cellular physiology.
Crenation refers to the swelling of a cell due to an influx of water, while lysis refers to the shrinkage of a cell due to the loss of water.
Crenation refers to the swelling of a cell due to an efflux of water, while lysis refers to the bursting of a cell due to an influx of water.
Crenation refers to the shrinkage of a cell due to an efflux of water, while lysis refers to the bursting of a cell due to an influx of water.
Crenation refers to the bursting of a cell due to an influx of water, while lysis refers to the swelling of a cell due to an efflux of water.
Peripheral proteins are located:
Actively involved in transport across the membrane
Embedded within the lipid bilayer
Loosely attached to the exterior or interior surface of the plasma membrane
Spanning the entire width of the membrane
An antiporter is a membrane protein that:
Requires ATP to transport ions or molecules against their concentration gradient
Facilitates the movement of two different ions or molecules in the same direction
Allows ions or molecules to move freely across the membrane
Exchanges two different ions or molecules in opposite directions
The glycocalyx is primarily composed of:
Glycoproteins and glycolipids
Integral proteins
Cholesterol molecules
Phospholipids
Glycolipids are composed of a carbohydrate chain attached to a lipid molecule.
True
False
Define "hydrophobic" in the context of the plasma membrane.
Having an affinity for water
A type of lipid molecule found in the membrane
Repelling water molecules
A protein attached to the exterior surface of the membrane
What is the function of glycolipids in the plasma membrane?
Structural support
Regulation of membrane fluidity
Cell recognition
Transport of ions and molecules
Active transport processes always move substances against their concentration gradient.
True
False
Vesicle transport involves the movement of substances:
Across the cell membrane through integral proteins
By diffusion along a concentration gradient
Into or out of the cell using energy from ATP
Only in prokaryotic cells
What is the term for the pressure exerted by a fluid at equilibrium at a given point within the fluid due to the force of gravity?
Osmotic pressure
Hydrostatic pressure
Concentration gradient
Osmolarity
Facilitated diffusion requires the input of energy to transport molecules across a membrane.
True
False
The sodium-potassium pump is an example of:
Passive transport
Primary active transport
Symporter
Facilitated diffusion
Integral proteins are only found on the surface of the plasma membrane.
False
True
According to the fluid-mosaic model, the plasma membrane is described as:
A rigid structure with no movement
A fluid structure with proteins embedded within it
A static structure composed solely of phospholipids
A solid barrier separating the cell from its environment
The sodium-potassium pump transports 3 sodium ions out of the cell and 2 potassium ions into the cell using energy from ATP.
True
False
