Cultures of Two Different Cell Types Are Exposed to the Same

question 45

Multiple Choice

Cultures of two different cell types are exposed to the same signaling ligand.Analysis of gene expression shows that only one of the cell types responded to the ligand.Which of the following may account for this difference?

• A) The ligand was only bioavailable to one of the cell types.
• B) Only one of the cell types contained accessible target gene DNA sequences.
• C) Only one cell type contained DNA.
• D) The ligand could only pass through the membrane of one of the cell types.

---

Definitions:

Maintenance Strategy

A planned approach for conducting upkeep and repairs of equipment, infrastructure, or systems to ensure their optimal working condition and longevity.

Breakdown Maintenance

Reactive maintenance performed after a machine or system fails in order to restore it to operating condition.