A mammalian cell contains 1.1 percentage:

Explanation

The correct answer is RNA. In a mammalian cell, RNA makes up about 1.1% of the cell's total mass, reflecting its role in protein synthesis and other regulatory functions. Proteins are much more abundant, as they are integral to the cell's structure and operations, accounting for a larger portion of the cell's mass. Water, being the most prevalent component, constitutes over 70% of the cell's mass. DNA, although essential for genetic information, exists in smaller quantities relative to the total cell mass compared to RNA.