Self Quiz for Eukaryotic Cell Structure: The Cytoplasmic Membrane

Self Quiz for Eukaryotic Cell Structure: The Cytoplasmic Membrane Tutorial

Study the material in this section and then write out the answers to these questions.
Do not just click on the answers and write them out. This will not test your understanding of this tutorial.

1. Match the following descriptions with the best answer.

_____ Proteins that, in the presence of energy, transport two substances simultaneously across the membrane in opposite directions. (ans)

_____ Proteins that, in the presence of energy, transport two substances simultaneously across the membrane in the same directions. (ans)

_____ The movement of water across a membrane from an area of higher water concentration (lower solute concentration) to lower water concentration (higher solute concentration). (ans)

_____ The net movement of gases or small uncharge polar molecules across a phospholipid bilayer membrane from an area of higher concentration to an area of lower concentration. No metabolic energy is required. (ans)

_____ A transport where the cell uses carrier proteins such as antiporters or symporters and energy to transport substances across the membrane against the concentration gradient. (ans)

_____ If the net flow of water is out of a cell, the cell is in ________________ environment. (ans)

_____ If the net flow of water is into a cell, the cell is in ________________ environment. (ans)

_____ The process by which a specific molecule called a ligand binds to a receptor protein in the cytoplasmic membrane and subsequently enters the cytoplasm in coated vesicles. (ans)

_____ The ingestion of dissolved materials by endocytosis whereby the cytoplasmic membrane invaginates and pinches off placing small droplets of fluid in a vesicle. (ans)

_____ The process by which a cell releases waste products or specific secretion products by the fusion of a vesicle with the cytoplasmic membrane. (ans)

A. uniporters
B. symporters
C. antiporters
D. active transport
E. passive diffusion
F. osmosis
G. exocytosis
H. pinocytosis
I. receptor-mediated endocytosis
J. phagocytosis
K. a hypotonic
L. a hypertonic
M. an isotonic

2. Even though there is a lower concentration of a particular nutrient outside a cell than inside, the cell is still able to transport that nutrient into its cytoplasm. Explain how this might occur and what is required for this transport. (ans)

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