Self Quiz for Prokaryotic Cell Structure: The Cytoplasmic Membrane

Self Quiz for Prokaryotic Cell Structure: The Cytoplasmic Membrane

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 transport proteins such as antiporters or symporters and metabolic 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)

A. uniporters
B. symporters
C. antiporters
D. active transport
E. group translocation
F. passive diffusion
G. osmosis
H. a hypotonic
I. a hypertonic
J. an isotonic

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

3. A bacterium is placed in a new environment and subsequently water flows out of the bacterium. Is this new environment isotonic, hypotonic, or hypertonic to the bacterium? Is the solute concentration higher inside the bacterium or outside? (ans)

4. Bacteria normally do not grow in jams and jellies. In terms of osmosis, what might explain this? (ans)

5. Define the following:

a. binary fission (ans)

b. geometric progression (ans)

RETURN TO "PROKARYOTIC CELL STRUCTURE: THE CYTOPLASMIC MEMBRANE"

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