5 Written questions
5 Matching questions
- first law of thermodynamics
- facilitated diffusion
- energy coupling
- a In cellular metabolism, the use of energy released from an exergonic reaction to drive an endergonic reaction.
- b The principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.
- c The passage of a substance through a specific transport protein across a biological membrane down its concentration gradient.
- d Cellular "drinking"; a type of endocytosis in which the cell takes fluid and dissolved solutes into small membranous vesicles.
- e The study of energy transformation that occurs in a collection of matter. See first law of thermodynamics; second law of thermodynamics.
5 Multiple choice questions
- Referring to a solution that, when surrounding a cell, will cause the cell to take up water.
- An energy-requiring chemical reaction, which yields products with more potential energy than the reactants. The amount of energy stored in the products equals the difference between the potential energy in the reactants and that in the products.
- An organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.
- 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.
- A transport protein in the plasma membrane of some plant or animal cells that facilitates the diffusion of water across the membrane (osmosis).
5 True/False questions
active site → The movement of a substance across a biological membrane against its concentration gradient, aided by specific transport proteins and requiring input of energy (often as ATP).
chemical energy → The energy of motion; the energy of a mass of matter that is moving. Moving matter does work by imparting motion to other matter.
endocytosis → Cellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.
tonicity → A measure of disorder. One form of disorder is heat, which is random molecular motion.
heat → Thermal energy; the amount of energy associated with the movement of the atoms and molecules in a body of matter. Heat is energy in its most random form.