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Questions and Answers
What is the primary energy source that drives simple diffusion of molecules or ions through the cell membrane?
What is the primary energy source that drives simple diffusion of molecules or ions through the cell membrane?
- Energy from the normal kinetic motion of the substance (correct)
- Energy derived from ATP hydrolysis
- Energy released from cellular respiration
- Energy obtained from sunlight
Which type of molecules or ions can move through intermolecular spaces in the cell membrane via simple diffusion?
Which type of molecules or ions can move through intermolecular spaces in the cell membrane via simple diffusion?
- Large proteins and complex carbohydrates
- Water and water-soluble molecules like ions, glucose, urea
- Lipid soluble molecules such as O2, CO2, alcohol (correct)
- Charged ions and polar molecules
What factors determine the rate of diffusion through a cell membrane?
What factors determine the rate of diffusion through a cell membrane?
- Temperature, pressure, and electrical charge of the substance
- Concentration gradient, molecular weight, and physical state of the substance
- Presence of carrier proteins, molecular shape, and polarity of the substance
- Amount of substance available, velocity of kinetic motion, number and sizes of openings in the membrane (correct)
What is the primary difference between simple diffusion and facilitated diffusion?
What is the primary difference between simple diffusion and facilitated diffusion?
Which type of molecules or ions can move through a membrane opening via simple diffusion?
Which type of molecules or ions can move through a membrane opening via simple diffusion?
What type of process is active transport across the cell membrane?
What type of process is active transport across the cell membrane?
In facilitated diffusion, the rate of diffusion approaches maximum as the concentration of the diffusing substance increases. This is known as ________.
In facilitated diffusion, the rate of diffusion approaches maximum as the concentration of the diffusing substance increases. This is known as ________.
Which of the following substances are transported by facilitated diffusion?
Which of the following substances are transported by facilitated diffusion?
What controls the opening and closing of gates in protein channels through chemical gating?
What controls the opening and closing of gates in protein channels through chemical gating?
What distinguishes protein channels of the cell membrane?
What distinguishes protein channels of the cell membrane?
Which mechanism is responsible for eliciting action potentials in nerves?
Which mechanism is responsible for eliciting action potentials in nerves?
What movement requires a source of energy besides kinetic energy and moves substances against an energy gradient?
What movement requires a source of energy besides kinetic energy and moves substances against an energy gradient?
Which substances are actively transported through some cell membranes?
Which substances are actively transported through some cell membranes?
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