The main purpose is protection. The lipid bilayer protects the cell from viruses and other threats to the cell. It also maintains homeostasis within the cell by monitoring the amount of substances the enter or exit the cell.
The answer is B. Females have two X chromosomes
Just so you know...
Males have one X and one Y
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~Just a girl in love with Shawn Mendes
Proteins help with acting as structural components in the body, speeding up chemical reactions, and transporting substances around the body. Proteins are made up of amino acids, which create enzymes. Enzymes are often affected by environmental factors in the body such as concentration, temperature, and pH.
Proteins are very important for DNA and RNA. (ribonucleic acid)
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