5 Written questions
5 Matching questions
- passive transport
- kinetic energy
- hypertonic solution
- energy coupling
- selective permeability
- a Referring to a solution that, when surrounding a cell, will cause the cell to lose water.
- b A property of biological membranes that allows some substances to cross more easily than others and blocks the passage of other substances altogether.
- c In cellular metabolism, the use of energy released from an exergonic reaction to drive an endergonic reaction.
- d The energy of motion; the energy of a mass of matter that is moving. Moving matter does work by imparting motion to other matter.
- e The diffusion of a substance across a biological membrane, without any input of energy.
5 Multiple choice questions
- Energy available in molecules for release in a chemical reaction; a form of potential energy.
- The aerobic harvesting of energy from food molecules; the energy-releasing chemical breakdown of food molecules, such as glucose, and the storage of potential energy in a form that cells can use to perform work; involves glycolysis, the citric acid cycle, and oxidative phosphorylation (the electron transport chain and chemiosmosis).
- A solution having the same solute concentration as another solution, thus having no effect on passage of water in or out of the cell.
- An increase or decrease in the density of a chemical substance in an area. Cells often maintain concentration gradients of ions across their membranes. When a gradient exists, substances tend to move from where they are more concentrated to where they are less concentrated.
- The movement of materials out of the cytoplasm of a cell by the fusion of vesicles with the plasma membrane.
5 True/False questions
endocytosis → Cellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.
tonicity → The ability of a solution surrounding a cell to cause that cell to gain or lose water.
first law of thermodynamics → The principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.
substrate → (1) A specific substance (reactant) on which an enzyme acts. Each enzyme recognizes only the specific substrate or substrates of the reaction it catalyzes. (2) A surface in or on which an organism lives.
competitive inhibitor → A substance that impedes the activity of an enzyme without entering an active site. By binding elsewhere on the enzyme, a noncompetitive inhibitor changes the shape of the enzyme so that the active site no longer functions.