5 Written questions
5 Matching questions
- competitive inhibitor
- hypotonic solution
- a The totality of an organism's chemical reactions.
- b The movement of materials out of the cytoplasm of a cell by the fusion of vesicles with the plasma membrane.
- c Referring to a solution that, when surrounding a cell, will cause the cell to take up water.
- d 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.
- e Cellular "drinking"; a type of endocytosis in which the cell takes fluid and dissolved solutes into small membranous vesicles.
5 Multiple choice questions
- The diffusion of a substance across a biological membrane, without any input of energy.
- A description of membrane structure, depicting a cellular membrane as a mosaic of diverse protein molecules embedded in a fluid bilayer made of phospholipid molecules.
- The diffusion of water across a selectively permeable membrane.
- A transport protein in the plasma membrane of some plant or animal cells that facilitates the diffusion of water across the membrane (osmosis).
- A method of metabolic control in which a product of a metabolic pathway acts as an inhibitor of an enzyme within that pathway.
5 True/False questions
kinetic energy → Energy available in molecules for release in a chemical reaction; a form of potential energy.
concentration gradient → 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.
phagocytosis → Cellular "eating"; a type of endocytosis whereby a cell engulfs macromolecules, other cells, or particles into its cytoplasm.
exergonic reaction → An energy-releasing chemical reaction in which the reactants contain more potential energy than the products. The reaction releases an amount of energy equal to the difference in potential energy between the reactants and the products.
receptor-mediated endocytosis → The movement of specific molecules into a cell by the inward budding of membranous vesicles. The vesicles contain proteins with receptor sites specific to the molecules being taken in.