A mutated strain of E. coli replicates DNA normally at 25°C, but replication stops immediately when the temperature is raised to 37°C. Which protein is likely to be non-functional at the higher temperature?

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#Question id: 2068

#Unit 2. Cellular Organization

Which of the following molecules dramatically increases the rate of diffusion of water across cell membranes?

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#Question id: 2069

#Unit 2. Cellular Organization

Which of the following processes includes all of the others?

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#Question id: 2070

#Unit 2. Cellular Organization

The sodium-potassium pump is called an electrogenic pump because it:

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#Question id: 2071

#Unit 2. Cellular Organization

Diffusion of ions across membranes through specific ion channels is driven by:

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#Question id: 2072

#Unit 2. Cellular Organization

Which of the following structures would decrease the electrochemical gradient across a membrane?

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#Question id: 2073

#Unit 2. Cellular Organization

The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Phosphate import depends on a pH gradient across the membrane—more acidic outside the cell than inside the cell. In this bacterial cell, phosphate transport is an example of: