5 Written questions
5 Matching questions
- passive transport
- concentration gradient
- a The diffusion of a substance across a biological membrane, without any input of energy.
- b The movement of materials out of the cytoplasm of a cell by the fusion of vesicles with the plasma membrane.
- c 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.
- d The ability of a solution surrounding a cell to cause that cell to gain or lose water.
- e The capacity to perform work, or to rearrange matter.
5 Multiple choice questions
- In cellular metabolism, the use of energy released from an exergonic reaction to drive an endergonic reaction.
- The principle whereby every energy conversion reduces the order of the universe, increasing its entropy. Ordered forms of energy are at least partly converted to heat.
- The study of energy transformation that occurs in a collection of matter. See first law of thermodynamics; second law of thermodynamics.
- A substance that reduces the activity of an enzyme by binding to the enzyme's active site in place of the substrate. A competitive inhibitor's structure mimics that of the enzyme's substrate.
- Referring to a solution that, when surrounding a cell, will cause the cell to take up water.
5 True/False questions
coenzyme → An organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.
osmosis → The diffusion of water across a selectively permeable membrane.
phosphorylation → Method by which organisms regulate solute concentrations and balance the gain and loss of water.
facilitated diffusion → The spontaneous tendency of a substance to move down its concentration gradient from where it is more concentrated to where it is less concentrated.
metabolism → A transport protein in the plasma membrane of some plant or animal cells that facilitates the diffusion of water across the membrane (osmosis).