The rigth answer is cell membrane.
A cell membrane distinguishes a fundamental cellular structure formed from a double layer of phospholipids associated with other lipids, proteins and carbohydrates.
The membrane of the cell, also known as the plasma or cytoplasmic membrane, is a biological membrane (biomembrane) that separates the interior of all cells from the external environment.
The plasma membrane, cytoplasmic membrane or plasmalemma delimits the cytoplasm of the cell. Organelles are surrounded by a single cell membrane (peroxisomes, lysosomes, endoplasmic reticulum, dictyosomes, vacuole) or double (nucleus, plastids).
Hi!the three-demnisonal (tertiary) structure of an enzyme is a single polypeptide chain "backbone".
The formation of protobionts that use DNA to direct the polymerization of amino acids have not yet been researched by scientist in order to learn about the origins of life on Earth
100% the answer is B
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