When a G Protein Is Activated in a Signal Transduction

question 217

Multiple Choice

When a G protein is activated in a signal transduction pathway,

• A) GDP is released from the G protein, and GTP occupies the nucleotide-binding site.
• B) GTP is released from the G protein, and GDP occupies the nucleotide-binding site.
• C) cGMP occupies the otherwise empty nucleotide-binding site on the G protein.
• D) cGMP leaves the otherwise occupied nucleotide-binding site on the G protein.
• E) GDP causes a conformational change in the G protein.

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Definitions:

Chi-Square Statistic

A statistical measure used to evaluate the differences between observed and expected frequencies in categorical variables.

Observed Frequencies

The number of times a particular value or event actually occurs in a dataset.

Expected Frequencies

In statistical analysis, these refer to the counts predicted by a probability model or theoretical distribution, used in the comparison of observed data for goodness-of-fit tests.

Contingency Table

A table often used in statistics to show the frequency distribution of variables, helping in the analysis of the relationship between them.