Transport of a Compound Across a Cell Membrane (Down a Concentration

question 36

Multiple Choice

Transport of a compound across a cell membrane (down a concentration gradient) was measured at several concentrations.The presence or absence of ATP had no effect on the transport of this compound.Which best describes the mechanism of transport?

• A) facilitated diffusion
• B) passive diffusion
• C) primary active transport
• D) secondary active transport
• E) proton pumping

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Definitions:

Median

The middle value in a data set, which separates the higher half from the lower half.

Range

In statistics, range is the difference between the largest and smallest values in a dataset.

Variance

A measure of the dispersion of a set of data points around their mean value, indicating how spread out the data are.

Deviations

Differences between observed values and some reference value, often the mean of the dataset.