5 Written questions
5 Matching questions
- selective permeability
- passive transport
- first law of thermodynamics
- a The diffusion of a substance across a biological membrane, without any input of energy.
- b The principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.
- c A nonprotein molecule or ion that is required for the proper functioning of an enzyme. See also coenzyme.
- d 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.
- e A property of biological membranes that allows some substances to cross more easily than others and blocks the passage of other substances altogether.
5 Multiple choice questions
- The passage of a substance through a specific transport protein across a biological membrane down its concentration gradient.
- An organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.
- The study of energy transformation that occurs in a collection of matter. See first law of thermodynamics; second law of thermodynamics.
- A protein (or RNA molecule) that serves as a biological catalyst, changing the rate of a chemical reaction without itself being changed into a different molecule in the process.
- A solution having the same solute concentration as another solution, thus having no effect on passage of water in or out of the cell.
5 True/False questions
phosphorylation → The transfer of a phosphate group, usually from ATP, to a molecule. Nearly all cellular work depends on ATP energizing other molecules by phosphorylation.
tonicity → The capacity to perform work, or to rearrange matter.
energy coupling → In cellular metabolism, the use of energy released from an exergonic reaction to drive an endergonic reaction.
entropy → The capacity to perform work, or to rearrange matter.
hypertonic solution → Referring to a solution that, when surrounding a cell, will cause the cell to lose water.