5 Written questions
5 Matching questions
- chemical energy
- active site
- a The transfer of a phosphate group, usually from ATP, to a molecule. Nearly all cellular work depends on ATP energizing other molecules by phosphorylation.
- b The part of an enzyme molecule where a substrate molecule attaches (by means of weak chemical bonds); typically, a pocket or groove on the enzyme's surface.
- c Energy available in molecules for release in a chemical reaction; a form of potential energy.
- 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 The capacity to perform work, or to rearrange matter.
5 Multiple choice questions
- 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.
- Main energy source for cells.
- The diffusion of water across a selectively permeable membrane.
- Referring to a solution that, when surrounding a cell, will cause the cell to take up water.
- 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).
5 True/False questions
entropy → The capacity to perform work, or to rearrange matter.
isotonic solution → Referring to a solution that, when surrounding a cell, will cause the cell to take up water.
active transport → 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).
second law of thermodynamics → The principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.
aquaporin → The diffusion of water across a selectively permeable membrane.