When Membrane-Bound Receptors Like HER2 Bind to Molecules Outside of a Human

question 65

Multiple Choice

When membrane-bound receptors like HER2 bind to molecules outside of a human cell,they must move laterally within the bilayer and also bind to a second HER2 receptor,forming a dimer (2-part molecule) ,in order for the signal to be further tranferred inside the cell through the membrane.This is possible because the cell membrane is

• A) a fluid mosaic.
• B) hydrophobic.
• C) a selectively permeable barrier.
• D) rigid like a cell wall.
• E) both selectively permeable and a fluid mosaic.

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Definitions:

Variable Overhead Efficiency Variance

The difference between actual and budgeted variable overhead costs, attributable to differences in productive efficiency.

Favorable

A term used in finance and accounting to describe a situation or variance that is better than expected or budgeted, often indicating profits or gains.

Labor Efficiency Variance

The difference between the actual labor hours used to produce a good or service and the standard labor hours expected to be used, measuring labor efficiency.

Variable Overhead Rate Variance

The difference between the actual variable overhead incurred and the expected (or standard) variable overhead based on activity levels.