Solutions that have more or greater concentration of hydroxide ions (OH-) than hydrogen ions (H+) are basic or alkali in nature. They showcase the properties of a base and not of an acid.
The answer is C. lipid membrane
The reason for this is, as stated in your question, it is called a phospholipid bilayer.
It's called like that because it is made out of lipids and it also has phosphate groups, while the bilayer part means it just has two layers. Therefore it is commonly also called a lipid membrane.
Following glycolysis, the mechanism of cellular respiration involves another multi-step process—the Krebs cycle, which is also called the citric acid cycle or the tricarboxylic acid cycle. The Krebs cycle uses the two molecules of pyruvic acid formed in glycolysis and yields high-energy molecules of NADH and flavin adenine dinucleotide (FADH2), as well as some ATP.
Technically this can be answered in a number of ways. But in elementary biology the cell is considered to be the basic unit of life.
